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Created by William Kapke
kangax's compat-table applied only to Node.js
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Node.js ES2015 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!99% complete99% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
99% complete99% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
99% complete99% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
99% complete99% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
99% complete99% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
99% complete99% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
99% complete99% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
99% complete99% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
99% complete99% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
99% complete99% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
99% complete99% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
99% complete99% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
99% complete99% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
99% complete99% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
99% complete99% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
99% complete99% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
99% complete99% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
99% complete99% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
99% complete99% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
99% complete99% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
99% complete99% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
99% complete99% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
99% complete99% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
99% complete99% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
99% complete99% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
99% complete99% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
99% complete99% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
99% complete99% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
99% complete99% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
99% complete99% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
99% complete99% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
99% complete99% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
99% complete99% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
99% complete99% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
99% complete99% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
99% complete99% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
99% complete99% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
99% complete99% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
99% complete99% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
99% complete99% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
99% complete99% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
99% complete99% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
99% complete99% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
99% complete99% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
99% complete99% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
99% complete99% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
99% complete99% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
99% complete99% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
99% complete99% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
99% complete99% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
99% complete98% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
98% complete98% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
99% complete98% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
95% complete91% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
57% complete46% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
47% complete43% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
29% complete22% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
10% complete6% complete

optimisation

proper tail calls (tail call optimisation)

ยงdirect recursion
?
function(){
"use strict"; return (function f(n){ if (n <= 0) { return "foo"; } return f(n - 1); }(1e6)) === "foo";
}
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function(){
"use strict"; return (function f(n){ if (n <= 0) { return "foo"; } return f(n - 1); }(1e6)) === "foo";
}
ยงmutual recursion
?
function(){
"use strict"; function f(n){ if (n <= 0) { return "foo"; } return g(n - 1); } function g(n){ if (n <= 0) { return "bar"; } return f(n - 1); } return f(1e6) === "foo" && f(1e6+1) === "bar";
}
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function(){
"use strict"; function f(n){ if (n <= 0) { return "foo"; } return g(n - 1); } function g(n){ if (n <= 0) { return "bar"; } return f(n - 1); } return f(1e6) === "foo" && f(1e6+1) === "bar";
}

syntax

default function parameters

ยงbasic functionality
?
function(){
return (function (a = 1, b = 2) { return a === 3 && b === 2; }(3));
}
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function(){
return (function (a = 1, b = 2) { return a === 3 && b === 2; }(3));
}
ยงexplicit undefined defers to the default
?
function(){
return (function (a = 1, b = 2) { return a === 1 && b === 3; }(undefined, 3));
}
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function(){
return (function (a = 1, b = 2) { return a === 1 && b === 3; }(undefined, 3));
}
ยงdefaults can refer to previous params
?
function(){
return (function (a, b = a) { return b === 5; }(5));
}
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function(){
return (function (a, b = a) { return b === 5; }(5));
}
ยงarguments object interaction
?
function(){
return (function (a = "baz", b = "qux", c = "quux") { a = "corge"; // The arguments object is not mapped to the // parameters, even outside of strict mode. return arguments.length === 2 && arguments[0] === "foo" && arguments[1] === "bar"; }("foo", "bar"));
}
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function(){
return (function (a = "baz", b = "qux", c = "quux") { a = "corge"; // The arguments object is not mapped to the // parameters, even outside of strict mode. return arguments.length === 2 && arguments[0] === "foo" && arguments[1] === "bar"; }("foo", "bar"));
}
ยงtemporal dead zone
?
function(){
return (function(x = 1) { try { eval("(function(a=a){}())"); return false; } catch(e) {} try { eval("(function(a=b,b){}())"); return false; } catch(e) {} return true; }());
}
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function(){
return (function(x = 1) { try { eval("(function(a=a){}())"); return false; } catch(e) {} try { eval("(function(a=b,b){}())"); return false; } catch(e) {} return true; }());
}
ยงseparate scope
?
function(){
return (function(a=function(){ return typeof b === 'undefined'; }){ var b = 1; return a(); }());
}
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function(){
return (function(a=function(){ return typeof b === 'undefined'; }){ var b = 1; return a(); }());
}
ยงnew Function() support
?
function(){
return new Function("a = 1", "b = 2", "return a === 3 && b === 2;" )(3);
}
Yes
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Error
Error
Error
Error
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Error
Error
function(){
return new Function("a = 1", "b = 2", "return a === 3 && b === 2;" )(3);
}

rest parameters

ยงbasic functionality
?
function(){
return (function (foo, ...args) { return args instanceof Array && args + "" === "bar,baz"; }("foo", "bar", "baz"));
}
Yes
Yes
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Error
Flag
Error
Flag
Error
Error
Error
Error
function(){
return (function (foo, ...args) { return args instanceof Array && args + "" === "bar,baz"; }("foo", "bar", "baz"));
}
ยงfunction 'length' property
?
function(){
return function(a, ...b){}.length === 1 && function(...c){}.length === 0;
}
Yes
Yes
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Error
Flag
Error
Flag
Error
Error
Error
Error
function(){
return function(a, ...b){}.length === 1 && function(...c){}.length === 0;
}
ยงarguments object interaction
?
function(){
return (function (foo, ...args) { foo = "qux"; // The arguments object is not mapped to the // parameters, even outside of strict mode. return arguments.length === 3 && arguments[0] === "foo" && arguments[1] === "bar" && arguments[2] === "baz"; }("foo", "bar", "baz"));
}
Yes
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Error
Flag
Error
Flag
Error
Error
Error
Error
function(){
return (function (foo, ...args) { foo = "qux"; // The arguments object is not mapped to the // parameters, even outside of strict mode. return arguments.length === 3 && arguments[0] === "foo" && arguments[1] === "bar" && arguments[2] === "baz"; }("foo", "bar", "baz"));
}
ยงcan't be used in setters
?
function(){
return (function (...args) { try { eval("({set e(...args){}})"); } catch(e) { return true; } }());
}
Yes
Yes
Yes
Yes
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Error
Flag
Error
Flag
Error
Error
Error
Error
function(){
return (function (...args) { try { eval("({set e(...args){}})"); } catch(e) { return true; } }());
}
ยงnew Function() support
?
function(){
return new Function("a", "...b", "return b instanceof Array && a+b === 'foobar,baz';" )('foo','bar','baz');
}
Yes
Yes
Yes
Yes
Yes
Yes
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Error
Flag
Error
Flag
Error
Error
Error
Error
function(){
return new Function("a", "...b", "return b instanceof Array && a+b === 'foobar,baz';" )('foo','bar','baz');
}

spread syntax for iterable objects

ยงwith arrays, in function calls
?
function(){
return Math.max(...[1, 2, 3]) === 3
}
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
return Math.max(...[1, 2, 3]) === 3
}
ยงwith arrays, in array literals
?
function(){
return [...[1, 2, 3]][2] === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
return [...[1, 2, 3]][2] === 3;
}
ยงwith sparse arrays, in function calls
?
function(){
var a = Array(...[,,]); return "0" in a && "1" in a && '' + a[0] + a[1] === "undefinedundefined";
}
Yes
Yes
Yes
Yes
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Error
Flag
Error
Error
Error
Error
function(){
var a = Array(...[,,]); return "0" in a && "1" in a && '' + a[0] + a[1] === "undefinedundefined";
}
ยงwith sparse arrays, in array literals
?
function(){
var a = [...[,,]]; return "0" in a && "1" in a && '' + a[0] + a[1] === "undefinedundefined";
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Error
Flag
Error
Error
Error
Error
function(){
var a = [...[,,]]; return "0" in a && "1" in a && '' + a[0] + a[1] === "undefinedundefined";
}
ยงwith strings, in function calls
?
function(){
return Math.max(..."1234") === 4;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Error
Flag
Error
Error
Error
Error
function(){
return Math.max(..."1234") === 4;
}
ยงwith strings, in array literals
?
function(){
return ["a", ..."bcd", "e"][3] === "d";
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
return ["a", ..."bcd", "e"][3] === "d";
}
ยงwith astral plane strings, in function calls
?
function(){
return Array(..."๐ ฎท๐ ฎถ")[0] === "๐ ฎท";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
return Array(..."๐ ฎท๐ ฎถ")[0] === "๐ ฎท";
}
ยงwith astral plane strings, in array literals
?
function(){
return [..."๐ ฎท๐ ฎถ"][0] === "๐ ฎท";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
return [..."๐ ฎท๐ ฎถ"][0] === "๐ ฎท";
}
ยงwith generator instances, in calls
?
function(){
var iterable = (function*(){ yield 1; yield 2; yield 3; }()); return Math.max(...iterable) === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
var iterable = (function*(){ yield 1; yield 2; yield 3; }()); return Math.max(...iterable) === 3;
}
ยงwith generator instances, in arrays
?
function(){
var iterable = (function*(){ yield "b"; yield "c"; yield "d"; }()); return ["a", ...iterable, "e"][3] === "d";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
var iterable = (function*(){ yield "b"; yield "c"; yield "d"; }()); return ["a", ...iterable, "e"][3] === "d";
}
ยงwith generic iterables, in calls
?
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Math.max(...iterable) === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Math.max(...iterable) === 3;
}
ยงwith generic iterables, in arrays
?
function(){
var iterable = global.__createIterableObject(["b", "c", "d"]); return ["a", ...iterable, "e"][3] === "d";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject(["b", "c", "d"]); return ["a", ...iterable, "e"][3] === "d";
}
ยงwith instances of iterables, in calls
?
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Math.max(...Object.create(iterable)) === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Math.max(...Object.create(iterable)) === 3;
}
ยงwith instances of iterables, in arrays
?
function(){
var iterable = global.__createIterableObject(["b", "c", "d"]); return ["a", ...Object.create(iterable), "e"][3] === "d";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject(["b", "c", "d"]); return ["a", ...Object.create(iterable), "e"][3] === "d";
}
ยงspreading non-iterables is a runtime error
?
function(){
try { Math.max(...2); } catch(e) { return Math.max(...[1, 2, 3]) === 3; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
function(){
try { Math.max(...2); } catch(e) { return Math.max(...[1, 2, 3]) === 3; }
}

object literal extensions

ยงcomputed properties
?
function(){
var x = 'y'; return ({ [x]: 1 }).y === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var x = 'y'; return ({ [x]: 1 }).y === 1;
}
ยงshorthand properties
?
function(){
var a = 7, b = 8, c = {a,b}; return c.a === 7 && c.b === 8;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var a = 7, b = 8, c = {a,b}; return c.a === 7 && c.b === 8;
}
ยงshorthand methods
?
function(){
return ({ y() { return 2; } }).y() === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
return ({ y() { return 2; } }).y() === 2;
}
ยงstring-keyed shorthand methods
?
function(){
return ({ "foo bar"() { return 4; } })["foo bar"]() === 4;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
return ({ "foo bar"() { return 4; } })["foo bar"]() === 4;
}
ยงcomputed shorthand methods
?
function(){
var x = 'y'; return ({ [x](){ return 1 } }).y() === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var x = 'y'; return ({ [x](){ return 1 } }).y() === 1;
}
ยงcomputed accessors
?
function(){
var x = 'y', valueSet, obj = { get [x] () { return 1 }, set [x] (value) { valueSet = value } }; obj.y = 'foo'; return obj.y === 1 && valueSet === 'foo';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var x = 'y', valueSet, obj = { get [x] () { return 1 }, set [x] (value) { valueSet = value } }; obj.y = 'foo'; return obj.y === 1 && valueSet === 'foo';
}

for..of loops

ยงwith arrays
?
function(){
var arr = [5]; for (var item of arr) return item === 5;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var arr = [5]; for (var item of arr) return item === 5;
}
ยงwith sparse arrays
?
function(){
var arr = [,,]; var count = 0; for (var item of arr) count += (item === void undefined); return count === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var arr = [,,]; var count = 0; for (var item of arr) count += (item === void undefined); return count === 2;
}
ยงwith strings
?
function(){
var str = ""; for (var item of "foo") str += item; return str === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var str = ""; for (var item of "foo") str += item; return str === "foo";
}
ยงwith astral plane strings
?
function(){
var str = ""; for (var item of "๐ ฎท๐ ฎถ") str += item + " "; return str === "๐ ฎท ๐ ฎถ ";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var str = ""; for (var item of "๐ ฎท๐ ฎถ") str += item + " "; return str === "๐ ฎท ๐ ฎถ ";
}
ยงwith generator instances
?
function(){
var result = ""; var iterable = (function*(){ yield 1; yield 2; yield 3; }()); for (var item of iterable) { result += item; } return result === "123";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var result = ""; var iterable = (function*(){ yield 1; yield 2; yield 3; }()); for (var item of iterable) { result += item; } return result === "123";
}
ยงwith generic iterables
?
function(){
var result = ""; var iterable = global.__createIterableObject([1, 2, 3]); for (var item of iterable) { result += item; } return result === "123";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var result = ""; var iterable = global.__createIterableObject([1, 2, 3]); for (var item of iterable) { result += item; } return result === "123";
}
ยงwith instances of generic iterables
?
function(){
var result = ""; var iterable = global.__createIterableObject([1, 2, 3]); for (var item of Object.create(iterable)) { result += item; } return result === "123";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var result = ""; var iterable = global.__createIterableObject([1, 2, 3]); for (var item of Object.create(iterable)) { result += item; } return result === "123";
}
ยงiterator closing, break
?
function(){
var closed = false; var iter = __createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); for (var it of iter) break; return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Error
Error
function(){
var closed = false; var iter = __createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); for (var it of iter) break; return closed;
}
ยงiterator closing, throw
?
function(){
var closed = false; var iter = __createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { for (var it of iter) throw 0; } catch(e){} return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Error
Error
function(){
var closed = false; var iter = __createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { for (var it of iter) throw 0; } catch(e){} return closed;
}

octal and binary literals

ยงoctal literals
?
function(){
return 0o10 === 8 && 0O10 === 8;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
function(){
return 0o10 === 8 && 0O10 === 8;
}
ยงbinary literals
?
function(){
return 0b10 === 2 && 0B10 === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
function(){
return 0b10 === 2 && 0B10 === 2;
}
ยงoctal supported by Number()
?
function(){
return Number('0o1') === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
return Number('0o1') === 1;
}
ยงbinary supported by Number()
?
function(){
return Number('0b1') === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
return Number('0b1') === 1;
}

template literals

ยงbasic functionality
?
function(){
var a = "ba", b = "QUX"; return `foo bar ${a + "z"} ${b.toLowerCase()}` === "foo bar\nbaz qux";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var a = "ba", b = "QUX"; return `foo bar ${a + "z"} ${b.toLowerCase()}` === "foo bar\nbaz qux";
}
ยงtoString conversion
?
function(){
var a = { toString: function() { return "foo"; }, valueOf: function() { return "bar"; } }; return `${a}` === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var a = { toString: function() { return "foo"; }, valueOf: function() { return "bar"; } }; return `${a}` === "foo";
}
ยงtagged template literals
?
function(){
var called = false; function fn(parts, a, b) { called = true; return parts instanceof Array && parts[0] === "foo" && parts[1] === "bar\n" && parts.raw[0] === "foo" && parts.raw[1] === "bar\\n" && a === 123 && b === 456; } return fn `foo${123}bar\n${456}` && called;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var called = false; function fn(parts, a, b) { called = true; return parts instanceof Array && parts[0] === "foo" && parts[1] === "bar\n" && parts.raw[0] === "foo" && parts.raw[1] === "bar\\n" && a === 123 && b === 456; } return fn `foo${123}bar\n${456}` && called;
}
ยงpassed array is frozen
?
function(){
return (function(parts) { return Object.isFrozen(parts) && Object.isFrozen(parts.raw); }) `foo${0}bar${0}baz`;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
return (function(parts) { return Object.isFrozen(parts) && Object.isFrozen(parts.raw); }) `foo${0}bar${0}baz`;
}
ยงline break normalisation
?
function(){
var cr = eval("`x" + String.fromCharCode(13) + "y`"); var lf = eval("`x" + String.fromCharCode(10) + "y`"); var crlf = eval("`x" + String.fromCharCode(13,10) + "y`"); return cr.length === 3 && lf.length === 3 && crlf.length === 3 && cr[1] === lf[1] && lf[1] === crlf[1] && crlf[1] === '\n';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var cr = eval("`x" + String.fromCharCode(13) + "y`"); var lf = eval("`x" + String.fromCharCode(10) + "y`"); var crlf = eval("`x" + String.fromCharCode(13,10) + "y`"); return cr.length === 3 && lf.length === 3 && crlf.length === 3 && cr[1] === lf[1] && lf[1] === crlf[1] && crlf[1] === '\n';
}
ยงTemplateStrings call site caching
?
function(){
// TemplateStrings caching was changed from per-contents to // per-call-site. // https://github.com/tc39/ecma262/pull/890 function strings(array) { return array; } function getStrings() { return strings`foo`; } var original = getStrings(); var other = strings`foo`; return original === getStrings() && original !== other;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Error
Error
Error
Error
function(){
// TemplateStrings caching was changed from per-contents to // per-call-site. // https://github.com/tc39/ecma262/pull/890 function strings(array) { return array; } function getStrings() { return strings`foo`; } var original = getStrings(); var other = strings`foo`; return original === getStrings() && original !== other;
}
ยงTemplateStrings permanent caching
?
function(){
function strings(array) { return array; } function getStrings() { return strings`foo`; } var original = getStrings(); var newed = new getStrings(); return original === getStrings() && original === newed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
function strings(array) { return array; } function getStrings() { return strings`foo`; } var original = getStrings(); var newed = new getStrings(); return original === getStrings() && original === newed;
}
ยงarbitrary escape sequences in tagged template literals
?
function(){
function strings(array) { return array; } var str = strings`\1\xz\uz\u{110000}\u{z}`; return str.length === 1 && str[0] === undefined && str.raw.length === 1 && str.raw[0]==="\\1\\xz\\uz\\u{110000}\\u{z}"
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
function strings(array) { return array; } var str = strings`\1\xz\uz\u{110000}\u{z}`; return str.length === 1 && str[0] === undefined && str.raw.length === 1 && str.raw[0]==="\\1\\xz\\uz\\u{110000}\\u{z}"
}

RegExp "y" and "u" flags

ยง"y" flag
?
function(){
var re = new RegExp('\\w', 'y'); re.exec('xy'); return (re.exec('xy')[0] === 'y');
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var re = new RegExp('\\w', 'y'); re.exec('xy'); return (re.exec('xy')[0] === 'y');
}
ยง"y" flag, lastIndex
?
function(){
var re = new RegExp('yy', 'y'); re.lastIndex = 3; var result = re.exec('xxxyyxx')[0]; return result === 'yy' && re.lastIndex === 5;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var re = new RegExp('yy', 'y'); re.lastIndex = 3; var result = re.exec('xxxyyxx')[0]; return result === 'yy' && re.lastIndex === 5;
}
ยง"u" flag
?
function(){
return "๐ ฎท".match(/^.$/u)[0].length === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return "๐ ฎท".match(/^.$/u)[0].length === 2;
}
ยง"u" flag, non-BMP Unicode characters
?
function(){
return "๐ ฎทx".match(/^.x$/u)[0].length === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return "๐ ฎทx".match(/^.x$/u)[0].length === 3;
}
ยง"u" flag, Unicode code point escapes
?
function(){
return "๐Œ†".match(/\u{1d306}/u)[0].length === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return "๐Œ†".match(/\u{1d306}/u)[0].length === 2;
}
ยง"u" flag, case folding
?
function(){
return "ลฟ".match(/S/iu) && "S".match(/ลฟ/iu);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return "ลฟ".match(/S/iu) && "S".match(/ลฟ/iu);
}

destructuring, declarations

ยงwith arrays
?
function(){
var [a, , [b], c] = [5, null, [6]]; return a === 5 && b === 6 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a, , [b], c] = [5, null, [6]]; return a === 5 && b === 6 && c === void undefined;
}
ยงwith sparse arrays
?
function(){
var [a, , b] = [,,,]; return a === void undefined && b === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a, , b] = [,,,]; return a === void undefined && b === void undefined;
}
ยงwith strings
?
function(){
var [a, b, c] = "ab"; return a === "a" && b === "b" && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a, b, c] = "ab"; return a === "a" && b === "b" && c === void undefined;
}
ยงwith astral plane strings
?
function(){
var [c] = "๐ ฎท๐ ฎถ"; return c === "๐ ฎท";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [c] = "๐ ฎท๐ ฎถ"; return c === "๐ ฎท";
}
ยงwith generator instances
?
function(){
var [a, b, c] = (function*(){ yield 1; yield 2; }()); return a === 1 && b === 2 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a, b, c] = (function*(){ yield 1; yield 2; }()); return a === 1 && b === 2 && c === void undefined;
}
ยงwith generic iterables
?
function(){
var [a, b, c] = global.__createIterableObject([1, 2]); return a === 1 && b === 2 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a, b, c] = global.__createIterableObject([1, 2]); return a === 1 && b === 2 && c === void undefined;
}
ยงwith instances of generic iterables
?
function(){
var [a, b, c] = Object.create(global.__createIterableObject([1, 2])); return a === 1 && b === 2 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a, b, c] = Object.create(global.__createIterableObject([1, 2])); return a === 1 && b === 2 && c === void undefined;
}
ยงiterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); var [a, b] = iter; return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); var [a, b] = iter; return closed;
}
ยงtrailing commas in iterable patterns
?
function(){
var [a,] = [1]; return a === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a,] = [1]; return a === 1;
}
ยงwith objects
?
function(){
var {c, x:d, e} = {c:7, x:8}; return c === 7 && d === 8 && e === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var {c, x:d, e} = {c:7, x:8}; return c === 7 && d === 8 && e === void undefined;
}
ยงobject destructuring with primitives
?
function(){
var {toFixed} = 2; var {slice} = ''; return toFixed === Number.prototype.toFixed && slice === String.prototype.slice;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var {toFixed} = 2; var {slice} = ''; return toFixed === Number.prototype.toFixed && slice === String.prototype.slice;
}
ยงtrailing commas in object patterns
?
function(){
var {a,} = {a:1}; return a === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var {a,} = {a:1}; return a === 1;
}
ยงthrows on null and undefined
?
function(){
try { var {a} = null; return false; } catch(e) { if (!(e instanceof TypeError)) return false; } try { var {b} = void undefined; return false; } catch(e) { if (!(e instanceof TypeError)) return false; } return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
try { var {a} = null; return false; } catch(e) { if (!(e instanceof TypeError)) return false; } try { var {b} = void undefined; return false; } catch(e) { if (!(e instanceof TypeError)) return false; } return true;
}
ยงcomputed properties
?
function(){
var qux = "corge"; var { [qux]: grault } = { corge: "garply" }; return grault === "garply";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var qux = "corge"; var { [qux]: grault } = { corge: "garply" }; return grault === "garply";
}
ยงmultiples in a single var statement
?
function(){
var [a,b] = [5,6], {c,d} = {c:7,d:8}; return a === 5 && b === 6 && c === 7 && d === 8;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a,b] = [5,6], {c,d} = {c:7,d:8}; return a === 5 && b === 6 && c === 7 && d === 8;
}
ยงnested
?
function(){
var [e, {x:f, g}] = [9, {x:10}]; var {h, x:[i]} = {h:11, x:[12]}; return e === 9 && f === 10 && g === void undefined && h === 11 && i === 12;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [e, {x:f, g}] = [9, {x:10}]; var {h, x:[i]} = {h:11, x:[12]}; return e === 9 && f === 10 && g === void undefined && h === 11 && i === 12;
}
ยงin for-in loop heads
?
function(){
for(var [i, j, k] in { qux: 1 }) { return i === "q" && j === "u" && k === "x"; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
for(var [i, j, k] in { qux: 1 }) { return i === "q" && j === "u" && k === "x"; }
}
ยงin for-of loop heads
?
function(){
for(var [i, j, k] of [[1,2,3]]) { return i === 1 && j === 2 && k === 3; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
for(var [i, j, k] of [[1,2,3]]) { return i === 1 && j === 2 && k === 3; }
}
ยงin catch heads
?
function(){
try { throw [1,2]; } catch([i,j]) { try { throw { k: 3, l: 4 }; } catch({k, l}) { return i === 1 && j === 2 && k === 3 && l === 4; } }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
try { throw [1,2]; } catch([i,j]) { try { throw { k: 3, l: 4 }; } catch({k, l}) { return i === 1 && j === 2 && k === 3 && l === 4; } }
}
ยงrest
?
function(){
var [a, ...b] = [3, 4, 5]; var [c, ...d] = [6]; return a === 3 && b instanceof Array && (b + "") === "4,5" && c === 6 && d instanceof Array && d.length === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var [a, ...b] = [3, 4, 5]; var [c, ...d] = [6]; return a === 3 && b instanceof Array && (b + "") === "4,5" && c === 6 && d instanceof Array && d.length === 0;
}
ยงdefaults
?
function(){
var {a = 1, b = 0, z:c = 3} = {b:2, z:undefined}; var [d = 0, e = 5, f = 6] = [4,,undefined]; return a === 1 && b === 2 && c === 3 && d === 4 && e === 5 && f === 6;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var {a = 1, b = 0, z:c = 3} = {b:2, z:undefined}; var [d = 0, e = 5, f = 6] = [4,,undefined]; return a === 1 && b === 2 && c === 3 && d === 4 && e === 5 && f === 6;
}
ยงdefaults, let temporal dead zone
?
function(){
var {a, b = 2} = {a:1}; try { eval("let {c = c} = {};"); return false; } catch(e){} try { eval("let {c = d, d} = {d:1};"); return false; } catch(e){} return a === 1 && b === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var {a, b = 2} = {a:1}; try { eval("let {c = c} = {};"); return false; } catch(e){} try { eval("let {c = d, d} = {d:1};"); return false; } catch(e){} return a === 1 && b === 2;
}

destructuring, assignment

ยงwith arrays
?
function(){
var a,b,c; [a, , [b], c] = [5, null, [6]]; return a === 5 && b === 6 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c; [a, , [b], c] = [5, null, [6]]; return a === 5 && b === 6 && c === void undefined;
}
ยงwith sparse arrays
?
function(){
var a, b; [a, , b] = [,,,]; return a === void undefined && b === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a, b; [a, , b] = [,,,]; return a === void undefined && b === void undefined;
}
ยงwith strings
?
function(){
var a,b,c; [a, b, c] = "ab"; return a === "a" && b === "b" && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c; [a, b, c] = "ab"; return a === "a" && b === "b" && c === void undefined;
}
ยงwith astral plane strings
?
function(){
var c; [c] = "๐ ฎท๐ ฎถ"; return c === "๐ ฎท";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var c; [c] = "๐ ฎท๐ ฎถ"; return c === "๐ ฎท";
}
ยงwith generator instances
?
function(){
var a,b,c; [a, b, c] = (function*(){ yield 1; yield 2; }()); return a === 1 && b === 2 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c; [a, b, c] = (function*(){ yield 1; yield 2; }()); return a === 1 && b === 2 && c === void undefined;
}
ยงwith generic iterables
?
function(){
var a,b,c; [a, b, c] = global.__createIterableObject([1, 2]); return a === 1 && b === 2 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c; [a, b, c] = global.__createIterableObject([1, 2]); return a === 1 && b === 2 && c === void undefined;
}
ยงwith instances of generic iterables
?
function(){
var a,b,c; [a, b, c] = Object.create(global.__createIterableObject([1, 2])); return a === 1 && b === 2 && c === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c; [a, b, c] = Object.create(global.__createIterableObject([1, 2])); return a === 1 && b === 2 && c === void undefined;
}
ยงiterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); var a,b; [a, b] = iter; return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); var a,b; [a, b] = iter; return closed;
}
ยงiterable destructuring expression
?
function(){
var a, b, iterable = [1,2]; return ([a, b] = iterable) === iterable;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a, b, iterable = [1,2]; return ([a, b] = iterable) === iterable;
}
ยงchained iterable destructuring
?
function(){
var a,b,c,d; [a,b] = [c,d] = [1,2]; return a === 1 && b === 2 && c === 1 && d === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c,d; [a,b] = [c,d] = [1,2]; return a === 1 && b === 2 && c === 1 && d === 2;
}
ยงtrailing commas in iterable patterns
?
function(){
var a; [a,] = [1]; return a === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a; [a,] = [1]; return a === 1;
}
ยงwith objects
?
function(){
var c,d,e; ({c, x:d, e} = {c:7, x:8}); return c === 7 && d === 8 && e === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var c,d,e; ({c, x:d, e} = {c:7, x:8}); return c === 7 && d === 8 && e === void undefined;
}
ยงobject destructuring with primitives
?
function(){
var toFixed, slice; ({toFixed} = 2); ({slice} = ''); return toFixed === Number.prototype.toFixed && slice === String.prototype.slice;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var toFixed, slice; ({toFixed} = 2); ({slice} = ''); return toFixed === Number.prototype.toFixed && slice === String.prototype.slice;
}
ยงtrailing commas in object patterns
?
function(){
var a; ({a,} = {a:1}); return a === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a; ({a,} = {a:1}); return a === 1;
}
ยงobject destructuring expression
?
function(){
var a, b, obj = { a:1, b:2 }; return ({a,b} = obj) === obj;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a, b, obj = { a:1, b:2 }; return ({a,b} = obj) === obj;
}
ยงparenthesised left-hand-side is a syntax error
?
function(){
var a, b; ({a,b} = {a:1,b:2}); try { eval("({a,b}) = {a:3,b:4};"); } catch(e) { return a === 1 && b === 2; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a, b; ({a,b} = {a:1,b:2}); try { eval("({a,b}) = {a:3,b:4};"); } catch(e) { return a === 1 && b === 2; }
}
ยงchained object destructuring
?
function(){
var a,b,c,d; ({a,b} = {c,d} = {a:1,b:2,c:3,d:4}); return a === 1 && b === 2 && c === 3 && d === 4;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c,d; ({a,b} = {c,d} = {a:1,b:2,c:3,d:4}); return a === 1 && b === 2 && c === 3 && d === 4;
}
ยงthrows on null and undefined
?
function(){
var a,b; try { ({a} = null); return false; } catch(e) { if (!(e instanceof TypeError)) return false; } try { ({b} = void undefined); return false; } catch(e) { if (!(e instanceof TypeError)) return false; } return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b; try { ({a} = null); return false; } catch(e) { if (!(e instanceof TypeError)) return false; } try { ({b} = void undefined); return false; } catch(e) { if (!(e instanceof TypeError)) return false; } return true;
}
ยงcomputed properties
?
function(){
var grault, qux = "corge"; ({ [qux]: grault } = { corge: "garply" }); return grault === "garply";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var grault, qux = "corge"; ({ [qux]: grault } = { corge: "garply" }); return grault === "garply";
}
ยงnested
?
function(){
var e,f,g,h,i; [e, {x:f, g}] = [9, {x:10}]; ({h, x:[i]} = {h:11, x:[12]}); return e === 9 && f === 10 && g === void undefined && h === 11 && i === 12;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var e,f,g,h,i; [e, {x:f, g}] = [9, {x:10}]; ({h, x:[i]} = {h:11, x:[12]}); return e === 9 && f === 10 && g === void undefined && h === 11 && i === 12;
}
ยงrest
?
function(){
var a,b,c,d; [a, ...b] = [3, 4, 5]; [c, ...d] = [6]; return a === 3 && b instanceof Array && (b + "") === "4,5" && c === 6 && d instanceof Array && d.length === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c,d; [a, ...b] = [3, 4, 5]; [c, ...d] = [6]; return a === 3 && b instanceof Array && (b + "") === "4,5" && c === 6 && d instanceof Array && d.length === 0;
}
ยงnested rest
?
function(){
var a = [1, 2, 3], first, last; [first, ...[a[2], last]] = a; return first === 1 && last === 3 && (a + "") === "1,2,2";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a = [1, 2, 3], first, last; [first, ...[a[2], last]] = a; return first === 1 && last === 3 && (a + "") === "1,2,2";
}
ยงempty patterns
?
function(){
[] = [1,2]; ({} = {a:1,b:2}); return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
[] = [1,2]; ({} = {a:1,b:2}); return true;
}
ยงdefaults
?
function(){
var a,b,c,d,e,f; ({a = 1, b = 0, z:c = 3} = {b:2, z:undefined}); [d = 0, e = 5, f = 6] = [4,,undefined]; return a === 1 && b === 2 && c === 3 && d === 4 && e === 5 && f === 6;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a,b,c,d,e,f; ({a = 1, b = 0, z:c = 3} = {b:2, z:undefined}); [d = 0, e = 5, f = 6] = [4,,undefined]; return a === 1 && b === 2 && c === 3 && d === 4 && e === 5 && f === 6;
}

destructuring, parameters

ยงwith arrays
?
function(){
return function([a, , [b], c]) { return a === 5 && b === 6 && c === void undefined; }([5, null, [6]]);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a, , [b], c]) { return a === 5 && b === 6 && c === void undefined; }([5, null, [6]]);
}
ยงwith sparse arrays
?
function(){
return function([a, , b]) { return a === void undefined && b === void undefined; }([,,,]);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a, , b]) { return a === void undefined && b === void undefined; }([,,,]);
}
ยงwith strings
?
function(){
return function([a, b, c]) { return a === "a" && b === "b" && c === void undefined; }("ab");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a, b, c]) { return a === "a" && b === "b" && c === void undefined; }("ab");
}
ยงwith astral plane strings
?
function(){
return function([c]) { return c === "๐ ฎท"; }("๐ ฎท๐ ฎถ");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([c]) { return c === "๐ ฎท"; }("๐ ฎท๐ ฎถ");
}
ยงwith generator instances
?
function(){
return function([a, b, c]) { return a === 1 && b === 2 && c === void undefined; }(function*(){ yield 1; yield 2; }());
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a, b, c]) { return a === 1 && b === 2 && c === void undefined; }(function*(){ yield 1; yield 2; }());
}
ยงwith generic iterables
?
function(){
return function([a, b, c]) { return a === 1 && b === 2 && c === void undefined; }(global.__createIterableObject([1, 2]));
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a, b, c]) { return a === 1 && b === 2 && c === void undefined; }(global.__createIterableObject([1, 2]));
}
ยงwith instances of generic iterables
?
function(){
return function([a, b, c]) { return a === 1 && b === 2 && c === void undefined; }(Object.create(global.__createIterableObject([1, 2])));
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a, b, c]) { return a === 1 && b === 2 && c === void undefined; }(Object.create(global.__createIterableObject([1, 2])));
}
ยงiterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); (function([a,b]) {}(iter)); return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); (function([a,b]) {}(iter)); return closed;
}
ยงtrailing commas in iterable patterns
?
function(){
return function([a,]) { return a === 1; }([1]);
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a,]) { return a === 1; }([1]);
}
ยงwith objects
?
function(){
return function({c, x:d, e}) { return c === 7 && d === 8 && e === void undefined; }({c:7, x:8});
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function({c, x:d, e}) { return c === 7 && d === 8 && e === void undefined; }({c:7, x:8});
}
ยงobject destructuring with primitives
?
function(){
return function({toFixed}, {slice}) { return toFixed === Number.prototype.toFixed && slice === String.prototype.slice; }(2,'');
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function({toFixed}, {slice}) { return toFixed === Number.prototype.toFixed && slice === String.prototype.slice; }(2,'');
}
ยงtrailing commas in object patterns
?
function(){
return function({a,}) { return a === 1; }({a:1});
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function({a,}) { return a === 1; }({a:1});
}
ยงthrows on null and undefined
?
function(){
try { (function({a}){}(null)); return false; } catch(e) {} try { (function({b}){}(undefined)); return false; } catch(e) {} return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
try { (function({a}){}(null)); return false; } catch(e) {} try { (function({b}){}(undefined)); return false; } catch(e) {} return true;
}
ยงcomputed properties
?
function(){
var qux = "corge"; return function({ [qux]: grault }) { return grault === "garply"; }({ corge: "garply" });
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var qux = "corge"; return function({ [qux]: grault }) { return grault === "garply"; }({ corge: "garply" });
}
ยงnested
?
function(){
return function([e, {x:f, g}], {h, x:[i]}) { return e === 9 && f === 10 && g === void undefined && h === 11 && i === 12; }([9, {x:10}],{h:11, x:[12]});
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([e, {x:f, g}], {h, x:[i]}) { return e === 9 && f === 10 && g === void undefined && h === 11 && i === 12; }([9, {x:10}],{h:11, x:[12]});
}
ยง'arguments' interaction
?
function(){
return (function({a, x:b, y:e}, [c, d]) { return arguments[0].a === 1 && arguments[0].x === 2 && !("y" in arguments[0]) && arguments[1] + '' === "3,4"; }({a:1, x:2}, [3, 4]));
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return (function({a, x:b, y:e}, [c, d]) { return arguments[0].a === 1 && arguments[0].x === 2 && !("y" in arguments[0]) && arguments[1] + '' === "3,4"; }({a:1, x:2}, [3, 4]));
}
ยงnew Function() support
?
function(){
return new Function("{a, x:b, y:e}","[c, d]", "return a === 1 && b === 2 && c === 3 && " + "d === 4 && e === void undefined;" )({a:1, x:2}, [3, 4]);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return new Function("{a, x:b, y:e}","[c, d]", "return a === 1 && b === 2 && c === 3 && " + "d === 4 && e === void undefined;" )({a:1, x:2}, [3, 4]);
}
ยงin parameters, function 'length' property
?
function(){
return function({a, b}, [c, d]){}.length === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function({a, b}, [c, d]){}.length === 2;
}
ยงrest
?
function(){
return function([a, ...b], [c, ...d]) { return a === 3 && b instanceof Array && (b + "") === "4,5" && c === 6 && d instanceof Array && d.length === 0; }([3, 4, 5], [6]);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function([a, ...b], [c, ...d]) { return a === 3 && b instanceof Array && (b + "") === "4,5" && c === 6 && d instanceof Array && d.length === 0; }([3, 4, 5], [6]);
}
ยงempty patterns
?
function(){
return function ([],{}){ return arguments[0] + '' === "3,4" && arguments[1].x === "foo"; }([3,4],{x:"foo"});
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return function ([],{}){ return arguments[0] + '' === "3,4" && arguments[1].x === "foo"; }([3,4],{x:"foo"});
}
ยงdefaults
?
function(){
return (function({a = 1, b = 0, c = 3, x:d = 0, y:e = 5}, [f = 6, g = 0, h = 8]) { return a === 1 && b === 2 && c === 3 && d === 4 && e === 5 && f === 6 && g === 7 && h === 8; }({b:2, c:undefined, x:4},[, 7, undefined]));
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return (function({a = 1, b = 0, c = 3, x:d = 0, y:e = 5}, [f = 6, g = 0, h = 8]) { return a === 1 && b === 2 && c === 3 && d === 4 && e === 5 && f === 6 && g === 7 && h === 8; }({b:2, c:undefined, x:4},[, 7, undefined]));
}
ยงdefaults, separate scope
?
function(){
return (function({a=function(){ return typeof b === 'undefined'; }}){ var b = 1; return a(); }({}));
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return (function({a=function(){ return typeof b === 'undefined'; }}){ var b = 1; return a(); }({}));
}
ยงdefaults, new Function() support
?
function(){
return new Function("{a = 1, b = 0, c = 3, x:d = 0, y:e = 5}", "return a === 1 && b === 2 && c === 3 && d === 4 && e === 5;" )({b:2, c:undefined, x:4});
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return new Function("{a = 1, b = 0, c = 3, x:d = 0, y:e = 5}", "return a === 1 && b === 2 && c === 3 && d === 4 && e === 5;" )({b:2, c:undefined, x:4});
}
ยงaliased defaults, arrow function
?
function(){
return ((a, {b: x = 0, c: y = 3}) => { return a === 1 && x === 2 && y === 3; })(1, {b: 2});
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return ((a, {b: x = 0, c: y = 3}) => { return a === 1 && x === 2 && y === 3; })(1, {b: 2});
}
ยงshorthand defaults, arrow function
?
function(){
return ((a, {b = 0, c = 3}) => { return a === 1 && b === 2 && c === 3; })(1, {b: 2});
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return ((a, {b = 0, c = 3}) => { return a === 1 && b === 2 && c === 3; })(1, {b: 2});
}
ยงduplicate identifier
?
function(){
try { eval('var d = function d([d]) { return d };'); if (d([true]) !== true) return false; } catch (e) { return !(e instanceof SyntaxError); } try { eval('var f = function f([id, id]) { return id }'); return false; } catch (e) { return e instanceof SyntaxError; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
try { eval('var d = function d([d]) { return d };'); if (d([true]) !== true) return false; } catch (e) { return !(e instanceof SyntaxError); } try { eval('var f = function f([id, id]) { return id }'); return false; } catch (e) { return e instanceof SyntaxError; }
}

Unicode code point escapes

ยงin strings
?
function(){
return '\u{1d306}' === '\ud834\udf06';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
return '\u{1d306}' === '\ud834\udf06';
}
ยงin identifiers
?
function(){
var \u{102C0} = 2; return \u{102C0} === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var \u{102C0} = 2; return \u{102C0} === 2;
}
ยงin property key definitions
?
function(){
var o = { \u{102C0} : 2 }; return o['\ud800\udec0'] === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var o = { \u{102C0} : 2 }; return o['\ud800\udec0'] === 2;
}
ยงin property key accesses
?
function(){
var o = { '\ud800\udec0' : 2 }; return o.\u{102C0} === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var o = { '\ud800\udec0' : 2 }; return o.\u{102C0} === 2;
}

new.target

ยงin constructors
?
function(){
var passed = false; new function f() { passed = (new.target === f); }(); (function() { passed &= (new.target === void undefined); }()); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new function f() { passed = (new.target === f); }(); (function() { passed &= (new.target === void undefined); }()); return passed;
}
ยงassignment is an early error
?
function(){
var passed = false; new function f() { passed = (new.target === f); }(); try { Function("new.target = function(){};"); } catch(e) { return passed; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new function f() { passed = (new.target === f); }(); try { Function("new.target = function(){};"); } catch(e) { return passed; }
}

bindings

const

ยงbasic support
?
function(){
const foo = 123; return (foo === 123);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
const foo = 123; return (foo === 123);
}
ยงis block-scoped
?
function(){
const bar = 123; { const bar = 456; } return bar === 123;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
const bar = 123; { const bar = 456; } return bar === 123;
}
ยงscope shadow resolution
?
function(){
try { { const bar = 456; } const bar = 123; return bar === 123; } catch(e) { return false; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
try { { const bar = 456; } const bar = 123; return bar === 123; } catch(e) { return false; }
}
ยงcannot be in statements
?
function(){
const bar = 1; try { Function("if(true) const baz = 1;")(); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
const bar = 1; try { Function("if(true) const baz = 1;")(); } catch(e) { return true; }
}
ยงredefining a const is an error
?
function(){
const baz = 1; try { Function("const foo = 1; foo = 2;")(); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
const baz = 1; try { Function("const foo = 1; foo = 2;")(); } catch(e) { return true; }
}
ยงfor loop statement scope
?
function(){
const baz = 1; for(const baz = 0; false;) {} return baz === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
const baz = 1; for(const baz = 0; false;) {} return baz === 1;
}
ยงfor-in loop iteration scope
?
function(){
var scopes = []; for(const i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Error
Error
Error
Error
function(){
var scopes = []; for(const i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
ยงfor-of loop iteration scope
?
function(){
var scopes = []; for(const i of ['a','b']) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Error
Error
Error
Error
function(){
var scopes = []; for(const i of ['a','b']) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
ยงtemporal dead zone
?
function(){
var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } const qux = 456; fn(); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } const qux = 456; fn(); return passed;
}
ยงbasic support (strict mode)
?
function(){
"use strict"; const foo = 123; return (foo === 123);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
"use strict"; const foo = 123; return (foo === 123);
}
ยงis block-scoped (strict mode)
?
function(){
'use strict'; const bar = 123; { const bar = 456; } return bar === 123;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; const bar = 123; { const bar = 456; } return bar === 123;
}
ยงscope shadow resolution (strict mode)
?
function(){
'use strict'; try { { const bar = 456; } const bar = 123; return bar === 123; } catch(e) { return false; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; try { { const bar = 456; } const bar = 123; return bar === 123; } catch(e) { return false; }
}
ยงcannot be in statements (strict mode)
?
function(){
'use strict'; const bar = 1; try { Function("'use strict'; if(true) const baz = 1;")(); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; const bar = 1; try { Function("'use strict'; if(true) const baz = 1;")(); } catch(e) { return true; }
}
ยงredefining a const (strict mode)
?
function(){
'use strict'; const baz = 1; try { Function("'use strict'; const foo = 1; foo = 2;")(); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; const baz = 1; try { Function("'use strict'; const foo = 1; foo = 2;")(); } catch(e) { return true; }
}
ยงfor loop statement scope (strict mode)
?
function(){
'use strict'; const baz = 1; for(const baz = 0; false;) {} return baz === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; const baz = 1; for(const baz = 0; false;) {} return baz === 1;
}
ยงfor-in loop iteration scope (strict mode)
?
function(){
'use strict'; var scopes = []; for(const i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
'use strict'; var scopes = []; for(const i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
ยงfor-of loop iteration scope (strict mode)
?
function(){
'use strict'; var scopes = []; for(const i of ['a','b']) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
'use strict'; var scopes = []; for(const i of ['a','b']) { scopes.push(function(){ return i; }); } return (scopes[0]() === "a" && scopes[1]() === "b");
}
ยงtemporal dead zone (strict mode)
?
function(){
'use strict'; var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } const qux = 456; fn(); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } const qux = 456; fn(); return passed;
}

let

ยงbasic support
?
function(){
let foo = 123; return (foo === 123);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
let foo = 123; return (foo === 123);
}
ยงis block-scoped
?
function(){
let bar = 123; { let bar = 456; } return bar === 123;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
let bar = 123; { let bar = 456; } return bar === 123;
}
ยงscope shadow resolution
?
function(){
try { { let bar = 456; } let bar = 123; return bar === 123; } catch(e) { return false; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
try { { let bar = 456; } let bar = 123; return bar === 123; } catch(e) { return false; }
}
ยงcannot be in statements
?
function(){
let bar = 1; try { Function("if(true) let baz = 1;")(); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
let bar = 1; try { Function("if(true) let baz = 1;")(); } catch(e) { return true; }
}
ยงfor loop statement scope
?
function(){
let baz = 1; for(let baz = 0; false;) {} return baz === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
let baz = 1; for(let baz = 0; false;) {} return baz === 1;
}
ยงtemporal dead zone
?
function(){
var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } let qux = 456; fn(); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } let qux = 456; fn(); return passed;
}
ยงfor/for-in loop iteration scope
?
function(){
let scopes = []; for(let i = 0; i < 2; i++) { scopes.push(function(){ return i; }); } let passed = (scopes[0]() === 0 && scopes[1]() === 1); scopes = []; for(let i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } passed &= (scopes[0]() === "a" && scopes[1]() === "b"); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
let scopes = []; for(let i = 0; i < 2; i++) { scopes.push(function(){ return i; }); } let passed = (scopes[0]() === 0 && scopes[1]() === 1); scopes = []; for(let i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } passed &= (scopes[0]() === "a" && scopes[1]() === "b"); return passed;
}
ยงfor-in loop binding shadowing parameter
?
function(){
try { Function("function f(e) { for (let e in {}) e }"); return true; } catch(e) { return false; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
try { Function("function f(e) { for (let e in {}) e }"); return true; } catch(e) { return false; }
}
ยงbasic support (strict mode)
?
function(){
'use strict'; let foo = 123; return (foo === 123);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; let foo = 123; return (foo === 123);
}
ยงis block-scoped (strict mode)
?
function(){
'use strict'; let bar = 123; { let bar = 456; } return bar === 123;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; let bar = 123; { let bar = 456; } return bar === 123;
}
ยงscope shadow resolution (strict mode)
?
function(){
'use strict'; try { { let bar = 456; } let bar = 123; return bar === 123; } catch(e) { return false; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
function(){
'use strict'; try { { let bar = 456; } let bar = 123; return bar === 123; } catch(e) { return false; }
}
ยงcannot be in statements (strict mode)
?
function(){
'use strict'; let bar = 1; try { Function("'use strict'; if(true) let baz = 1;")(); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
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Error
Flag
Error
Flag
function(){
'use strict'; let bar = 1; try { Function("'use strict'; if(true) let baz = 1;")(); } catch(e) { return true; }
}
ยงfor loop statement scope (strict mode)
?
function(){
'use strict'; let baz = 1; for(let baz = 0; false;) {} return baz === 1;
}
Yes
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Error
Flag
Error
Flag
function(){
'use strict'; let baz = 1; for(let baz = 0; false;) {} return baz === 1;
}
ยงtemporal dead zone (strict mode)
?
function(){
'use strict'; var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } let qux = 456; fn(); return passed;
}
Yes
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Error
Flag
Error
Flag
function(){
'use strict'; var passed = (function(){ try { qux; } catch(e) { return true; }}()); function fn() { passed &= qux === 456; } let qux = 456; fn(); return passed;
}
ยงfor/for-in loop iteration scope (strict mode)
?
function(){
'use strict'; let scopes = []; for(let i = 0; i < 2; i++) { scopes.push(function(){ return i; }); } let passed = (scopes[0]() === 0 && scopes[1]() === 1); scopes = []; for(let i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } passed &= (scopes[0]() === "a" && scopes[1]() === "b"); return passed;
}
Yes
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Yes
Error
Flag
Error
No
function(){
'use strict'; let scopes = []; for(let i = 0; i < 2; i++) { scopes.push(function(){ return i; }); } let passed = (scopes[0]() === 0 && scopes[1]() === 1); scopes = []; for(let i in { a:1, b:1 }) { scopes.push(function(){ return i; }); } passed &= (scopes[0]() === "a" && scopes[1]() === "b"); return passed;
}
ยงfor-in loop binding shadowing parameter (strict mode)
?
function(){
try { Function("'use strict'; function f(e) { for (let e in {}) e }"); return true; } catch(e) { return false; }
}
Yes
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No
Flag
No
Flag
function(){
try { Function("'use strict'; function f(e) { for (let e in {}) e }"); return true; } catch(e) { return false; }
}

ยงblock-level function declaration
?
function(){
'use strict'; if (f() !== 1) return false; function f() { return 1; } { if (f() !== 2) return false; function f() { return 2; } if (f() !== 2) return false; } if (f() !== 1) return false; return true;
}
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Error
Flag
Error
Flag
function(){
'use strict'; if (f() !== 1) return false; function f() { return 1; } { if (f() !== 2) return false; function f() { return 2; } if (f() !== 2) return false; } if (f() !== 1) return false; return true;
}

functions

arrow functions

ยง0 parameters
?
function(){
return (() => 5)() === 5;
}
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Error
Flag
Error
Error
function(){
return (() => 5)() === 5;
}
ยง1 parameter, no brackets
?
function(){
var b = x => x + "foo"; return (b("fee fie foe ") === "fee fie foe foo");
}
Yes
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Error
Flag
Error
Error
function(){
var b = x => x + "foo"; return (b("fee fie foe ") === "fee fie foe foo");
}
ยงmultiple parameters
?
function(){
var c = (v, w, x, y, z) => "" + v + w + x + y + z; return (c(6, 5, 4, 3, 2) === "65432");
}
Yes
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Error
Flag
Error
Error
function(){
var c = (v, w, x, y, z) => "" + v + w + x + y + z; return (c(6, 5, 4, 3, 2) === "65432");
}
ยงlexical "this" binding
?
function(){
var d = { x : "bar", y : function() { return z => this.x + z; }}.y(); var e = { x : "baz", y : d }; return d("ley") === "barley" && e.y("ley") === "barley";
}
Yes
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Error
No
Error
Error
function(){
var d = { x : "bar", y : function() { return z => this.x + z; }}.y(); var e = { x : "baz", y : d }; return d("ley") === "barley" && e.y("ley") === "barley";
}
ยง"this" unchanged by call or apply
?
function(){
var d = { x : "foo", y : function() { return () => this.x; }}; var e = { x : "bar" }; return d.y().call(e) === "foo" && d.y().apply(e) === "foo";
}
Yes
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Error
No
Error
Error
function(){
var d = { x : "foo", y : function() { return () => this.x; }}; var e = { x : "bar" }; return d.y().call(e) === "foo" && d.y().apply(e) === "foo";
}
ยงcan't be bound, can be curried
?
function(){
var d = { x : "bar", y : function() { return z => this.x + z; }}; var e = { x : "baz" }; return d.y().bind(e, "ley")() === "barley";
}
Yes
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Yes
Yes
Error
No
Error
Error
function(){
var d = { x : "bar", y : function() { return z => this.x + z; }}; var e = { x : "baz" }; return d.y().bind(e, "ley")() === "barley";
}
ยงlexical "arguments" binding
?
function(){
var f = (function() { return z => arguments[0]; }(5)); return f(6) === 5;
}
Yes
Yes
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Yes
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Error
No
Error
Error
function(){
var f = (function() { return z => arguments[0]; }(5)); return f(6) === 5;
}
ยงno line break between params and =>
?
function(){
return (() => { try { Function("x\n => 2")(); } catch(e) { return true; } })();
}
Yes
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Error
No
Error
Error
function(){
return (() => { try { Function("x\n => 2")(); } catch(e) { return true; } })();
}
ยงcorrect precedence
?
function(){
return (() => { try { Function("0 || () => 2")(); } catch(e) { return true; } })();
}
Yes
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No
No
No
No
Error
No
Error
Error
function(){
return (() => { try { Function("0 || () => 2")(); } catch(e) { return true; } })();
}
ยงno "prototype" property
?
function(){
var a = () => 5; return !a.hasOwnProperty("prototype");
}
Yes
Yes
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Yes
Yes
Error
No
Error
Error
function(){
var a = () => 5; return !a.hasOwnProperty("prototype");
}
ยงlexical "super" binding in constructors
?
function(){
var received; class B { constructor (arg) { received = arg; } } class C extends B { constructor () { var callSuper = () => super('foo'); callSuper(); } } return new C instanceof C && received === 'foo'
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var received; class B { constructor (arg) { received = arg; } } class C extends B { constructor () { var callSuper = () => super('foo'); callSuper(); } } return new C instanceof C && received === 'foo'
}
ยงlexical "super" binding in methods
?
function(){
class B { qux() { return "quux"; } } class C extends B { baz() { return x => super.qux(); } } var arrow = new C().baz(); return arrow() === "quux";
}
Yes
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Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class B { qux() { return "quux"; } } class C extends B { baz() { return x => super.qux(); } } var arrow = new C().baz(); return arrow() === "quux";
}
ยงlexical "new.target" binding
?
function(){
function C() { return x => new.target; } return new C()() === C && C()() === void undefined;
}
Yes
Yes
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Yes
Yes
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Yes
Error
Error
Error
Error
Error
Error
function(){
function C() { return x => new.target; } return new C()() === C && C()() === void undefined;
}

class

ยงclass statement
?
function(){
class C {} return typeof C === "function";
}
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C {} return typeof C === "function";
}
ยงis block-scoped
?
function(){
class C {} var c1 = C; { class C {} var c2 = C; } return C === c1;
}
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C {} var c1 = C; { class C {} var c2 = C; } return C === c1;
}
ยงclass expression
?
function(){
return typeof class C {} === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
return typeof class C {} === "function";
}
ยงanonymous class
?
function(){
return typeof class {} === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
return typeof class {} === "function";
}
ยงconstructor
?
function(){
class C { constructor() { this.x = 1; } } return C.prototype.constructor === C && new C().x === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { constructor() { this.x = 1; } } return C.prototype.constructor === C && new C().x === 1;
}
ยงprototype methods
?
function(){
class C { method() { return 2; } } return typeof C.prototype.method === "function" && new C().method() === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { method() { return 2; } } return typeof C.prototype.method === "function" && new C().method() === 2;
}
ยงstring-keyed methods
?
function(){
class C { "foo bar"() { return 2; } } return typeof C.prototype["foo bar"] === "function" && new C()["foo bar"]() === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { "foo bar"() { return 2; } } return typeof C.prototype["foo bar"] === "function" && new C()["foo bar"]() === 2;
}
ยงcomputed prototype methods
?
function(){
var foo = "method"; class C { [foo]() { return 2; } } return typeof C.prototype.method === "function" && new C().method() === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var foo = "method"; class C { [foo]() { return 2; } } return typeof C.prototype.method === "function" && new C().method() === 2;
}
ยงoptional semicolons
?
function(){
class C { ; method() { return 2; }; method2() { return 2; } method3() { return 2; }; } return typeof C.prototype.method === "function" && typeof C.prototype.method2 === "function" && typeof C.prototype.method3 === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { ; method() { return 2; }; method2() { return 2; } method3() { return 2; }; } return typeof C.prototype.method === "function" && typeof C.prototype.method2 === "function" && typeof C.prototype.method3 === "function";
}
ยงstatic methods
?
function(){
class C { static method() { return 3; } } return typeof C.method === "function" && C.method() === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { static method() { return 3; } } return typeof C.method === "function" && C.method() === 3;
}
ยงcomputed static methods
?
function(){
var foo = "method"; class C { static [foo]() { return 3; } } return typeof C.method === "function" && C.method() === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var foo = "method"; class C { static [foo]() { return 3; } } return typeof C.method === "function" && C.method() === 3;
}
ยงaccessor properties
?
function(){
var baz = false; class C { get foo() { return "foo"; } set bar(x) { baz = x; } } new C().bar = true; return new C().foo === "foo" && baz;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var baz = false; class C { get foo() { return "foo"; } set bar(x) { baz = x; } } new C().bar = true; return new C().foo === "foo" && baz;
}
ยงcomputed accessor properties
?
function(){
var garply = "foo", grault = "bar", baz = false; class C { get [garply]() { return "foo"; } set [grault](x) { baz = x; } } new C().bar = true; return new C().foo === "foo" && baz;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var garply = "foo", grault = "bar", baz = false; class C { get [garply]() { return "foo"; } set [grault](x) { baz = x; } } new C().bar = true; return new C().foo === "foo" && baz;
}
ยงstatic accessor properties
?
function(){
var baz = false; class C { static get foo() { return "foo"; } static set bar(x) { baz = x; } } C.bar = true; return C.foo === "foo" && baz;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var baz = false; class C { static get foo() { return "foo"; } static set bar(x) { baz = x; } } C.bar = true; return C.foo === "foo" && baz;
}
ยงcomputed static accessor properties
?
function(){
var garply = "foo", grault = "bar", baz = false; class C { static get [garply]() { return "foo"; } static set [grault](x) { baz = x; } } C.bar = true; return C.foo === "foo" && baz;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var garply = "foo", grault = "bar", baz = false; class C { static get [garply]() { return "foo"; } static set [grault](x) { baz = x; } } C.bar = true; return C.foo === "foo" && baz;
}
ยงclass name is lexically scoped
?
function(){
class C { method() { return typeof C === "function"; } } var M = C.prototype.method; C = void undefined; return C === void undefined && M();
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { method() { return typeof C === "function"; } } var M = C.prototype.method; C = void undefined; return C === void undefined && M();
}
ยงcomputed names, temporal dead zone
?
function(){
try { var B = class C { [C](){} } } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
try { var B = class C { [C](){} } } catch(e) { return true; }
}
ยงmethods aren't enumerable
?
function(){
class C { foo() {} static bar() {} } return !C.prototype.propertyIsEnumerable("foo") && !C.propertyIsEnumerable("bar");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { foo() {} static bar() {} } return !C.prototype.propertyIsEnumerable("foo") && !C.propertyIsEnumerable("bar");
}
ยงimplicit strict mode
?
function(){
class C { static method() { return this === void undefined; } } return (0,C.method)();
}
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { static method() { return this === void undefined; } } return (0,C.method)();
}
ยงconstructor requires new
?
function(){
class C {} try { C(); } catch(e) { return true; }
}
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C {} try { C(); } catch(e) { return true; }
}
ยงextends
?
function(){
class B {} class C extends B {} return new C() instanceof B && B.isPrototypeOf(C);
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class B {} class C extends B {} return new C() instanceof B && B.isPrototypeOf(C);
}
ยงextends expressions
?
function(){
var B; class C extends (B = class {}) {} return new C() instanceof B && B.isPrototypeOf(C);
}
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var B; class C extends (B = class {}) {} return new C() instanceof B && B.isPrototypeOf(C);
}
ยงextends null
?
function(){
class C extends null { constructor() { return Object.create(null); } } return Function.prototype.isPrototypeOf(C) && Object.getPrototypeOf(C.prototype) === null;
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends null { constructor() { return Object.create(null); } } return Function.prototype.isPrototypeOf(C) && Object.getPrototypeOf(C.prototype) === null;
}
ยงnew.target
?
function(){
var passed = false; new function f() { passed = new.target === f; }(); class A { constructor() { passed &= new.target === B; } } class B extends A {} new B(); return passed;
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new function f() { passed = new.target === f; }(); class A { constructor() { passed &= new.target === B; } } class B extends A {} new B(); return passed;
}

super

ยงstatement in constructors
?
function(){
var passed = false; class B { constructor(a) { passed = (a === "barbaz"); } } class C extends B { constructor(a) { super("bar" + a); } } new C("baz"); return passed;
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var passed = false; class B { constructor(a) { passed = (a === "barbaz"); } } class C extends B { constructor(a) { super("bar" + a); } } new C("baz"); return passed;
}
ยงexpression in constructors
?
function(){
class B { constructor(a) { return ["foo" + a]; } } class C extends B { constructor(a) { return super("bar" + a); } } return new C("baz")[0] === "foobarbaz";
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class B { constructor(a) { return ["foo" + a]; } } class C extends B { constructor(a) { return super("bar" + a); } } return new C("baz")[0] === "foobarbaz";
}
ยงin methods, property access
?
function(){
class B {} B.prototype.qux = "foo"; B.prototype.corge = "baz"; class C extends B { quux(a) { return super.qux + a + super["corge"]; } } C.prototype.qux = "garply"; return new C().quux("bar") === "foobarbaz";
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class B {} B.prototype.qux = "foo"; B.prototype.corge = "baz"; class C extends B { quux(a) { return super.qux + a + super["corge"]; } } C.prototype.qux = "garply"; return new C().quux("bar") === "foobarbaz";
}
ยงin methods, method calls
?
function(){
class B { qux(a) { return "foo" + a; } } class C extends B { qux(a) { return super.qux("bar" + a); } } return new C().qux("baz") === "foobarbaz";
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class B { qux(a) { return "foo" + a; } } class C extends B { qux(a) { return super.qux("bar" + a); } } return new C().qux("baz") === "foobarbaz";
}
ยงmethod calls use correct "this" binding
?
function(){
class B { qux(a) { return this.foo + a; } } class C extends B { qux(a) { return super.qux("bar" + a); } } var obj = new C(); obj.foo = "foo"; return obj.qux("baz") === "foobarbaz";
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class B { qux(a) { return this.foo + a; } } class C extends B { qux(a) { return super.qux("bar" + a); } } var obj = new C(); obj.foo = "foo"; return obj.qux("baz") === "foobarbaz";
}
ยงconstructor calls use correct "new.target" binding
?
function(){
var passed; class B { constructor() { passed = (new.target === C); } } class C extends B { constructor() { super(); } } new C(); return passed;
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var passed; class B { constructor() { passed = (new.target === C); } } class C extends B { constructor() { super(); } } new C(); return passed;
}
ยงis statically bound
?
function(){
class B { qux() { return "bar"; } } class C extends B { qux() { return super.qux() + this.corge; } } var obj = { qux: C.prototype.qux, corge: "ley" }; return obj.qux() === "barley";
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class B { qux() { return "bar"; } } class C extends B { qux() { return super.qux() + this.corge; } } var obj = { qux: C.prototype.qux, corge: "ley" }; return obj.qux() === "barley";
}
ยงsuper() invokes the correct constructor
?
function(){
// checks that super() is *not* a synonym of super.constructor() var passed; class B { constructor() { passed = true; } }; B.prototype.constructor = function () { passed = false; }; class C extends B { }; new C; return passed;
}
Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
function(){
// checks that super() is *not* a synonym of super.constructor() var passed; class B { constructor() { passed = true; } }; B.prototype.constructor = function () { passed = false; }; class C extends B { }; new C; return passed;
}

generators

ยงbasic functionality
?
function(){
function * generator(){ yield 5; yield 6; }; var iterator = generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
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Error
Flag
Error
Error
function(){
function * generator(){ yield 5; yield 6; }; var iterator = generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงgenerator function expressions
?
function(){
var generator = function * (){ yield 5; yield 6; }; var iterator = generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
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Yes
Error
Flag
Error
Error
function(){
var generator = function * (){ yield 5; yield 6; }; var iterator = generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงcorrect "this" binding
?
function(){
function * generator(){ yield this.x; yield this.y; }; var iterator = { g: generator, x: 5, y: 6 }.g(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
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Error
Flag
Error
Error
function(){
function * generator(){ yield this.x; yield this.y; }; var iterator = { g: generator, x: 5, y: 6 }.g(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงcan't use "this" with new
?
function(){
function * generator(){ yield this.x; yield this.y; }; try { (new generator()).next(); } catch (e) { return true; }
}
Yes
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No
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Error
No
Error
Error
function(){
function * generator(){ yield this.x; yield this.y; }; try { (new generator()).next(); } catch (e) { return true; }
}
ยงsending
?
function(){
var sent; function * generator(){ sent = [yield 5, yield 6]; }; var iterator = generator(); iterator.next(); iterator.next("foo"); iterator.next("bar"); return sent[0] === "foo" && sent[1] === "bar";
}
Yes
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Error
Flag
Error
Error
function(){
var sent; function * generator(){ sent = [yield 5, yield 6]; }; var iterator = generator(); iterator.next(); iterator.next("foo"); iterator.next("bar"); return sent[0] === "foo" && sent[1] === "bar";
}
ยง%GeneratorPrototype%
?
function(){
function * generatorFn(){} var ownProto = Object.getPrototypeOf(generatorFn()); var passed = ownProto === generatorFn.prototype; var sharedProto = Object.getPrototypeOf(ownProto); passed &= sharedProto !== Object.prototype && sharedProto === Object.getPrototypeOf(function*(){}.prototype) && sharedProto.hasOwnProperty('next'); return passed;
}
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Error
Flag
Error
Error
function(){
function * generatorFn(){} var ownProto = Object.getPrototypeOf(generatorFn()); var passed = ownProto === generatorFn.prototype; var sharedProto = Object.getPrototypeOf(ownProto); passed &= sharedProto !== Object.prototype && sharedProto === Object.getPrototypeOf(function*(){}.prototype) && sharedProto.hasOwnProperty('next'); return passed;
}
ยง%GeneratorPrototype% prototype chain
?
function(){
function * generatorFn(){} var g = generatorFn(); var ownProto = Object.getPrototypeOf(g); var passed = ownProto === generatorFn.prototype; var sharedProto = Object.getPrototypeOf(ownProto); var iterProto = Object.getPrototypeOf(sharedProto); passed &= iterProto.hasOwnProperty(Symbol.iterator) && !sharedProto .hasOwnProperty(Symbol.iterator) && !ownProto .hasOwnProperty(Symbol.iterator) && g[Symbol.iterator]() === g; return passed;
}
Yes
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Error
No
Error
Error
function(){
function * generatorFn(){} var g = generatorFn(); var ownProto = Object.getPrototypeOf(g); var passed = ownProto === generatorFn.prototype; var sharedProto = Object.getPrototypeOf(ownProto); var iterProto = Object.getPrototypeOf(sharedProto); passed &= iterProto.hasOwnProperty(Symbol.iterator) && !sharedProto .hasOwnProperty(Symbol.iterator) && !ownProto .hasOwnProperty(Symbol.iterator) && g[Symbol.iterator]() === g; return passed;
}
ยง%GeneratorPrototype%.constructor
?
function(){
function * g (){} var iterator = new g.constructor("a","b","c","yield a; yield b; yield c;")(5,6,7); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; passed &= g.constructor === (function*(){}).constructor; return passed;
}
Yes
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Yes
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Yes
Error
Flag
Error
Error
function(){
function * g (){} var iterator = new g.constructor("a","b","c","yield a; yield b; yield c;")(5,6,7); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; passed &= g.constructor === (function*(){}).constructor; return passed;
}
ยง%GeneratorPrototype%.throw
?
function(){
var passed = false; function * generator(){ try { yield 5; yield 6; } catch(e) { passed = (e === "foo"); } }; var iterator = generator(); iterator.next(); iterator.throw("foo"); return passed;
}
Yes
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Yes
Error
Flag
Error
Error
function(){
var passed = false; function * generator(){ try { yield 5; yield 6; } catch(e) { passed = (e === "foo"); } }; var iterator = generator(); iterator.next(); iterator.throw("foo"); return passed;
}
ยง%GeneratorPrototype%.return
?
function(){
function * generator(){ yield 5; yield 6; }; var iterator = generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.return("quxquux"); passed &= item.value === "quxquux" && item.done === true; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
function * generator(){ yield 5; yield 6; }; var iterator = generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.return("quxquux"); passed &= item.value === "quxquux" && item.done === true; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield operator precedence
?
function(){
var passed; function * generator(){ passed = yield 0 ? true : false; }; var iterator = generator(); iterator.next(); iterator.next(true); return passed;
}
Yes
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Yes
Yes
Error
Flag
Error
Error
function(){
var passed; function * generator(){ passed = yield 0 ? true : false; }; var iterator = generator(); iterator.next(); iterator.next(true); return passed;
}
ยงyield *, arrays
?
function(){
var iterator = (function * generator() { yield * [5, 6]; }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * [5, 6]; }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield *, sparse arrays
?
function(){
var iterator = (function * generator() { yield * [,,]; }()); var item = iterator.next(); var passed = item.value === void undefined && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * [,,]; }()); var item = iterator.next(); var passed = item.value === void undefined && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield *, strings
?
function(){
var iterator = (function * generator() { yield * "56"; }()); var item = iterator.next(); var passed = item.value === "5" && item.done === false; item = iterator.next(); passed &= item.value === "6" && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * "56"; }()); var item = iterator.next(); var passed = item.value === "5" && item.done === false; item = iterator.next(); passed &= item.value === "6" && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield *, astral plane strings
?
function(){
var iterator = (function * generator() { yield * "๐ ฎท๐ ฎถ"; }()); var item = iterator.next(); var passed = item.value === "๐ ฎท" && item.done === false; item = iterator.next(); passed &= item.value === "๐ ฎถ" && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
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Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * "๐ ฎท๐ ฎถ"; }()); var item = iterator.next(); var passed = item.value === "๐ ฎท" && item.done === false; item = iterator.next(); passed &= item.value === "๐ ฎถ" && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield *, generator instances
?
function(){
var iterator = (function * generator() { yield * (function*(){ yield 5; yield 6; yield 7; }()); }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * (function*(){ yield 5; yield 6; yield 7; }()); }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield *, generic iterables
?
function(){
var iterator = (function * generator() { yield * global.__createIterableObject([5, 6, 7]); }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * global.__createIterableObject([5, 6, 7]); }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield *, instances of iterables
?
function(){
var iterator = (function * generator() { yield * Object.create(__createIterableObject([5, 6, 7])); }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
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Yes
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Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * Object.create(__createIterableObject([5, 6, 7])); }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === 7 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงyield * on non-iterables is a runtime error
?
function(){
var iterator = (function * generator() { yield * [5]; }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; iterator = (function * generator() { yield * 5; }()); try { iterator.next(); } catch (e) { return passed; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
function(){
var iterator = (function * generator() { yield * [5]; }()); var item = iterator.next(); var passed = item.value === 5 && item.done === false; iterator = (function * generator() { yield * 5; }()); try { iterator.next(); } catch (e) { return passed; }
}
ยงyield *, iterator closing
?
function(){
var closed = ''; var iter = __createIterableObject([1, 2, 3], { 'return': function(){ closed += 'a'; return {done: true}; } }); var gen = (function* generator(){ try { yield *iter; } finally { closed += 'b'; } })(); gen.next(); gen['return'](); return closed === 'ab';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var closed = ''; var iter = __createIterableObject([1, 2, 3], { 'return': function(){ closed += 'a'; return {done: true}; } }); var gen = (function* generator(){ try { yield *iter; } finally { closed += 'b'; } })(); gen.next(); gen['return'](); return closed === 'ab';
}
ยงyield *, iterator closing via throw()
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'throw': undefined, 'return': function() { closed = true; return {done: true}; } }); var gen = (function*(){ try { yield *iter; } catch(e){} })(); gen.next(); gen['throw'](); return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Error
No
Error
Error
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'throw': undefined, 'return': function() { closed = true; return {done: true}; } }); var gen = (function*(){ try { yield *iter; } catch(e){} })(); gen.next(); gen['throw'](); return closed;
}
ยงshorthand generator methods
?
function(){
var o = { * generator() { yield 5; yield 6; } }; var iterator = o.generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var o = { * generator() { yield 5; yield 6; } }; var iterator = o.generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงstring-keyed shorthand generator methods
?
function(){
var o = { * "foo bar"() { yield 5; yield 6; } }; var iterator = o["foo bar"](); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var o = { * "foo bar"() { yield 5; yield 6; } }; var iterator = o["foo bar"](); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงcomputed shorthand generators
?
function(){
var garply = "generator"; var o = { * [garply] () { yield 5; yield 6; } }; var iterator = o.generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var garply = "generator"; var o = { * [garply] () { yield 5; yield 6; } }; var iterator = o.generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงshorthand generator methods, classes
?
function(){
class C { * generator() { yield 5; yield 6; } }; var iterator = new C().generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { * generator() { yield 5; yield 6; } }; var iterator = new C().generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงcomputed shorthand generators, classes
?
function(){
var garply = "generator"; class C { * [garply] () { yield 5; yield 6; } } var iterator = new C().generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var garply = "generator"; class C { * [garply] () { yield 5; yield 6; } } var iterator = new C().generator(); var item = iterator.next(); var passed = item.value === 5 && item.done === false; item = iterator.next(); passed &= item.value === 6 && item.done === false; item = iterator.next(); passed &= item.value === void undefined && item.done === true; return passed;
}
ยงshorthand generators can't be constructors
?
function(){
class C { * generator() { yield 5; yield 6; } }; try { Function("class D { * constructor() { return {}; } }"); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { * generator() { yield 5; yield 6; } }; try { Function("class D { * constructor() { return {}; } }"); } catch(e) { return true; }
}

built-ins

typed arrays

ยงInt8Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Int8Array(buffer); view[0] = 0x80; return view[0] === -0x80;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Int8Array(buffer); view[0] = 0x80; return view[0] === -0x80;
}
ยงUint8Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Uint8Array(buffer); view[0] = 0x100; return view[0] === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Uint8Array(buffer); view[0] = 0x100; return view[0] === 0;
}
ยงUint8ClampedArray
?
function(){
var buffer = new ArrayBuffer(64); var view = new Uint8ClampedArray(buffer); view[0] = 0x100; return view[0] === 0xFF;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Uint8ClampedArray(buffer); view[0] = 0x100; return view[0] === 0xFF;
}
ยงInt16Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Int16Array(buffer); view[0] = 0x8000; return view[0] === -0x8000;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Int16Array(buffer); view[0] = 0x8000; return view[0] === -0x8000;
}
ยงUint16Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Uint16Array(buffer); view[0] = 0x10000; return view[0] === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Uint16Array(buffer); view[0] = 0x10000; return view[0] === 0;
}
ยงInt32Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Int32Array(buffer); view[0] = 0x80000000; return view[0] === -0x80000000;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Int32Array(buffer); view[0] = 0x80000000; return view[0] === -0x80000000;
}
ยงUint32Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Uint32Array(buffer); view[0] = 0x100000000; return view[0] === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Uint32Array(buffer); view[0] = 0x100000000; return view[0] === 0;
}
ยงFloat32Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Float32Array(buffer); view[0] = 0.1; return view[0] === 0.10000000149011612;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Float32Array(buffer); view[0] = 0.1; return view[0] === 0.10000000149011612;
}
ยงFloat64Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new Float64Array(buffer); view[0] = 0.1; return view[0] === 0.1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new Float64Array(buffer); view[0] = 0.1; return view[0] === 0.1;
}
ยงDataView (Int8)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setInt8 (0, 0x80); return view.getInt8(0) === -0x80;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setInt8 (0, 0x80); return view.getInt8(0) === -0x80;
}
ยงDataView (Uint8)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setUint8(0, 0x100); return view.getUint8(0) === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setUint8(0, 0x100); return view.getUint8(0) === 0;
}
ยงDataView (Int16)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setInt16(0, 0x8000); return view.getInt16(0) === -0x8000;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setInt16(0, 0x8000); return view.getInt16(0) === -0x8000;
}
ยงDataView (Uint16)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setUint16(0, 0x10000); return view.getUint16(0) === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setUint16(0, 0x10000); return view.getUint16(0) === 0;
}
ยงDataView (Int32)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setInt32(0, 0x80000000); return view.getInt32(0) === -0x80000000;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setInt32(0, 0x80000000); return view.getInt32(0) === -0x80000000;
}
ยงDataView (Uint32)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setUint32(0, 0x100000000); return view.getUint32(0) === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setUint32(0, 0x100000000); return view.getUint32(0) === 0;
}
ยงDataView (Float32)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setFloat32(0, 0.1); return view.getFloat32(0) === 0.10000000149011612;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setFloat32(0, 0.1); return view.getFloat32(0) === 0.10000000149011612;
}
ยงDataView (Float64)
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setFloat64(0, 0.1); return view.getFloat64(0) === 0.1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setFloat64(0, 0.1); return view.getFloat64(0) === 0.1;
}
ยงArrayBuffer[Symbol.species]
?
function(){
return typeof ArrayBuffer[Symbol.species] === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
return typeof ArrayBuffer[Symbol.species] === 'function';
}
ยงconstructors require new
?
function(){
var buffer = new ArrayBuffer(64); var constructors = [ 'ArrayBuffer', 'DataView', 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ]; return constructors.every(function (constructor) { try { if (constructor in global) { global[constructor](constructor === "ArrayBuffer" ? 64 : buffer); } return false; } catch(e) { return true; } });
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
var buffer = new ArrayBuffer(64); var constructors = [ 'ArrayBuffer', 'DataView', 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ]; return constructors.every(function (constructor) { try { if (constructor in global) { global[constructor](constructor === "ArrayBuffer" ? 64 : buffer); } return false; } catch(e) { return true; } });
}
ยงconstructors accept generic iterables
?
function(){
var constructors = [ 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ]; for(var i = 0; i < constructors.length; i++){ var arr = new global[constructors[i]](__createIterableObject([1, 2, 3])); if(arr.length !== 3 || arr[0] !== 1 || arr[1] !== 2 || arr[2] !== 3)return false; } return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
var constructors = [ 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ]; for(var i = 0; i < constructors.length; i++){ var arr = new global[constructors[i]](__createIterableObject([1, 2, 3])); if(arr.length !== 3 || arr[0] !== 1 || arr[1] !== 2 || arr[2] !== 3)return false; } return true;
}
ยงcorrect prototype chains
?
function(){
var constructors = [ 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ]; var constructor = Object.getPrototypeOf(Int8Array); var prototype = Object.getPrototypeOf(Int8Array.prototype); if(constructor === Function.prototype || prototype === Object.prototype)return false; for(var i = 0; i < constructors.length; i+=1) { if (!(constructors[i] in global && Object.getPrototypeOf(global[constructors[i]]) === constructor && Object.getPrototypeOf(global[constructors[i]].prototype) === prototype && Object.getOwnPropertyNames(global[constructors[i]].prototype).sort() + '' === "BYTES_PER_ELEMENT,constructor")) { return false; } } return true;
}
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
function(){
var constructors = [ 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ]; var constructor = Object.getPrototypeOf(Int8Array); var prototype = Object.getPrototypeOf(Int8Array.prototype); if(constructor === Function.prototype || prototype === Object.prototype)return false; for(var i = 0; i < constructors.length; i+=1) { if (!(constructors[i] in global && Object.getPrototypeOf(global[constructors[i]]) === constructor && Object.getPrototypeOf(global[constructors[i]].prototype) === prototype && Object.getOwnPropertyNames(global[constructors[i]].prototype).sort() + '' === "BYTES_PER_ELEMENT,constructor")) { return false; } } return true;
}
ยง%TypedArray%.from
?
function(){
return typeof Int8Array.from === "function" && typeof Uint8Array.from === "function" && typeof Uint8ClampedArray.from === "function" && typeof Int16Array.from === "function" && typeof Uint16Array.from === "function" && typeof Int32Array.from === "function" && typeof Uint32Array.from === "function" && typeof Float32Array.from === "function" && typeof Float64Array.from === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.from === "function" && typeof Uint8Array.from === "function" && typeof Uint8ClampedArray.from === "function" && typeof Int16Array.from === "function" && typeof Uint16Array.from === "function" && typeof Int32Array.from === "function" && typeof Uint32Array.from === "function" && typeof Float32Array.from === "function" && typeof Float64Array.from === "function";
}
ยง%TypedArray%.of
?
function(){
return typeof Int8Array.of === "function" && typeof Uint8Array.of === "function" && typeof Uint8ClampedArray.of === "function" && typeof Int16Array.of === "function" && typeof Uint16Array.of === "function" && typeof Int32Array.of === "function" && typeof Uint32Array.of === "function" && typeof Float32Array.of === "function" && typeof Float64Array.of === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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No
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function(){
return typeof Int8Array.of === "function" && typeof Uint8Array.of === "function" && typeof Uint8ClampedArray.of === "function" && typeof Int16Array.of === "function" && typeof Uint16Array.of === "function" && typeof Int32Array.of === "function" && typeof Uint32Array.of === "function" && typeof Float32Array.of === "function" && typeof Float64Array.of === "function";
}
ยง%TypedArray%.prototype.subarray
?
function(){
return typeof Int8Array.prototype.subarray === "function" && typeof Uint8Array.prototype.subarray === "function" && typeof Uint8ClampedArray.prototype.subarray === "function" && typeof Int16Array.prototype.subarray === "function" && typeof Uint16Array.prototype.subarray === "function" && typeof Int32Array.prototype.subarray === "function" && typeof Uint32Array.prototype.subarray === "function" && typeof Float32Array.prototype.subarray === "function" && typeof Float64Array.prototype.subarray === "function";
}
Yes
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No
No
function(){
return typeof Int8Array.prototype.subarray === "function" && typeof Uint8Array.prototype.subarray === "function" && typeof Uint8ClampedArray.prototype.subarray === "function" && typeof Int16Array.prototype.subarray === "function" && typeof Uint16Array.prototype.subarray === "function" && typeof Int32Array.prototype.subarray === "function" && typeof Uint32Array.prototype.subarray === "function" && typeof Float32Array.prototype.subarray === "function" && typeof Float64Array.prototype.subarray === "function";
}
ยง%TypedArray%.prototype.join
?
function(){
return typeof Int8Array.prototype.join === "function" && typeof Uint8Array.prototype.join === "function" && typeof Uint8ClampedArray.prototype.join === "function" && typeof Int16Array.prototype.join === "function" && typeof Uint16Array.prototype.join === "function" && typeof Int32Array.prototype.join === "function" && typeof Uint32Array.prototype.join === "function" && typeof Float32Array.prototype.join === "function" && typeof Float64Array.prototype.join === "function";
}
Yes
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No
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No
function(){
return typeof Int8Array.prototype.join === "function" && typeof Uint8Array.prototype.join === "function" && typeof Uint8ClampedArray.prototype.join === "function" && typeof Int16Array.prototype.join === "function" && typeof Uint16Array.prototype.join === "function" && typeof Int32Array.prototype.join === "function" && typeof Uint32Array.prototype.join === "function" && typeof Float32Array.prototype.join === "function" && typeof Float64Array.prototype.join === "function";
}
ยง%TypedArray%.prototype.indexOf
?
function(){
return typeof Int8Array.prototype.indexOf === "function" && typeof Uint8Array.prototype.indexOf === "function" && typeof Uint8ClampedArray.prototype.indexOf === "function" && typeof Int16Array.prototype.indexOf === "function" && typeof Uint16Array.prototype.indexOf === "function" && typeof Int32Array.prototype.indexOf === "function" && typeof Uint32Array.prototype.indexOf === "function" && typeof Float32Array.prototype.indexOf === "function" && typeof Float64Array.prototype.indexOf === "function";
}
Yes
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No
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No
function(){
return typeof Int8Array.prototype.indexOf === "function" && typeof Uint8Array.prototype.indexOf === "function" && typeof Uint8ClampedArray.prototype.indexOf === "function" && typeof Int16Array.prototype.indexOf === "function" && typeof Uint16Array.prototype.indexOf === "function" && typeof Int32Array.prototype.indexOf === "function" && typeof Uint32Array.prototype.indexOf === "function" && typeof Float32Array.prototype.indexOf === "function" && typeof Float64Array.prototype.indexOf === "function";
}
ยง%TypedArray%.prototype.lastIndexOf
?
function(){
return typeof Int8Array.prototype.lastIndexOf === "function" && typeof Uint8Array.prototype.lastIndexOf === "function" && typeof Uint8ClampedArray.prototype.lastIndexOf === "function" && typeof Int16Array.prototype.lastIndexOf === "function" && typeof Uint16Array.prototype.lastIndexOf === "function" && typeof Int32Array.prototype.lastIndexOf === "function" && typeof Uint32Array.prototype.lastIndexOf === "function" && typeof Float32Array.prototype.lastIndexOf === "function" && typeof Float64Array.prototype.lastIndexOf === "function";
}
Yes
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No
No
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No
function(){
return typeof Int8Array.prototype.lastIndexOf === "function" && typeof Uint8Array.prototype.lastIndexOf === "function" && typeof Uint8ClampedArray.prototype.lastIndexOf === "function" && typeof Int16Array.prototype.lastIndexOf === "function" && typeof Uint16Array.prototype.lastIndexOf === "function" && typeof Int32Array.prototype.lastIndexOf === "function" && typeof Uint32Array.prototype.lastIndexOf === "function" && typeof Float32Array.prototype.lastIndexOf === "function" && typeof Float64Array.prototype.lastIndexOf === "function";
}
ยง%TypedArray%.prototype.slice
?
function(){
return typeof Int8Array.prototype.slice === "function" && typeof Uint8Array.prototype.slice === "function" && typeof Uint8ClampedArray.prototype.slice === "function" && typeof Int16Array.prototype.slice === "function" && typeof Uint16Array.prototype.slice === "function" && typeof Int32Array.prototype.slice === "function" && typeof Uint32Array.prototype.slice === "function" && typeof Float32Array.prototype.slice === "function" && typeof Float64Array.prototype.slice === "function";
}
Yes
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Yes
No
No
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No
function(){
return typeof Int8Array.prototype.slice === "function" && typeof Uint8Array.prototype.slice === "function" && typeof Uint8ClampedArray.prototype.slice === "function" && typeof Int16Array.prototype.slice === "function" && typeof Uint16Array.prototype.slice === "function" && typeof Int32Array.prototype.slice === "function" && typeof Uint32Array.prototype.slice === "function" && typeof Float32Array.prototype.slice === "function" && typeof Float64Array.prototype.slice === "function";
}
ยง%TypedArray%.prototype.every
?
function(){
return typeof Int8Array.prototype.every === "function" && typeof Uint8Array.prototype.every === "function" && typeof Uint8ClampedArray.prototype.every === "function" && typeof Int16Array.prototype.every === "function" && typeof Uint16Array.prototype.every === "function" && typeof Int32Array.prototype.every === "function" && typeof Uint32Array.prototype.every === "function" && typeof Float32Array.prototype.every === "function" && typeof Float64Array.prototype.every === "function";
}
Yes
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Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.every === "function" && typeof Uint8Array.prototype.every === "function" && typeof Uint8ClampedArray.prototype.every === "function" && typeof Int16Array.prototype.every === "function" && typeof Uint16Array.prototype.every === "function" && typeof Int32Array.prototype.every === "function" && typeof Uint32Array.prototype.every === "function" && typeof Float32Array.prototype.every === "function" && typeof Float64Array.prototype.every === "function";
}
ยง%TypedArray%.prototype.filter
?
function(){
return typeof Int8Array.prototype.filter === "function" && typeof Uint8Array.prototype.filter === "function" && typeof Uint8ClampedArray.prototype.filter === "function" && typeof Int16Array.prototype.filter === "function" && typeof Uint16Array.prototype.filter === "function" && typeof Int32Array.prototype.filter === "function" && typeof Uint32Array.prototype.filter === "function" && typeof Float32Array.prototype.filter === "function" && typeof Float64Array.prototype.filter === "function";
}
Yes
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Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.filter === "function" && typeof Uint8Array.prototype.filter === "function" && typeof Uint8ClampedArray.prototype.filter === "function" && typeof Int16Array.prototype.filter === "function" && typeof Uint16Array.prototype.filter === "function" && typeof Int32Array.prototype.filter === "function" && typeof Uint32Array.prototype.filter === "function" && typeof Float32Array.prototype.filter === "function" && typeof Float64Array.prototype.filter === "function";
}
ยง%TypedArray%.prototype.forEach
?
function(){
return typeof Int8Array.prototype.forEach === "function" && typeof Uint8Array.prototype.forEach === "function" && typeof Uint8ClampedArray.prototype.forEach === "function" && typeof Int16Array.prototype.forEach === "function" && typeof Uint16Array.prototype.forEach === "function" && typeof Int32Array.prototype.forEach === "function" && typeof Uint32Array.prototype.forEach === "function" && typeof Float32Array.prototype.forEach === "function" && typeof Float64Array.prototype.forEach === "function";
}
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.forEach === "function" && typeof Uint8Array.prototype.forEach === "function" && typeof Uint8ClampedArray.prototype.forEach === "function" && typeof Int16Array.prototype.forEach === "function" && typeof Uint16Array.prototype.forEach === "function" && typeof Int32Array.prototype.forEach === "function" && typeof Uint32Array.prototype.forEach === "function" && typeof Float32Array.prototype.forEach === "function" && typeof Float64Array.prototype.forEach === "function";
}
ยง%TypedArray%.prototype.map
?
function(){
return typeof Int8Array.prototype.map === "function" && typeof Uint8Array.prototype.map === "function" && typeof Uint8ClampedArray.prototype.map === "function" && typeof Int16Array.prototype.map === "function" && typeof Uint16Array.prototype.map === "function" && typeof Int32Array.prototype.map === "function" && typeof Uint32Array.prototype.map === "function" && typeof Float32Array.prototype.map === "function" && typeof Float64Array.prototype.map === "function";
}
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.map === "function" && typeof Uint8Array.prototype.map === "function" && typeof Uint8ClampedArray.prototype.map === "function" && typeof Int16Array.prototype.map === "function" && typeof Uint16Array.prototype.map === "function" && typeof Int32Array.prototype.map === "function" && typeof Uint32Array.prototype.map === "function" && typeof Float32Array.prototype.map === "function" && typeof Float64Array.prototype.map === "function";
}
ยง%TypedArray%.prototype.reduce
?
function(){
return typeof Int8Array.prototype.reduce === "function" && typeof Uint8Array.prototype.reduce === "function" && typeof Uint8ClampedArray.prototype.reduce === "function" && typeof Int16Array.prototype.reduce === "function" && typeof Uint16Array.prototype.reduce === "function" && typeof Int32Array.prototype.reduce === "function" && typeof Uint32Array.prototype.reduce === "function" && typeof Float32Array.prototype.reduce === "function" && typeof Float64Array.prototype.reduce === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.reduce === "function" && typeof Uint8Array.prototype.reduce === "function" && typeof Uint8ClampedArray.prototype.reduce === "function" && typeof Int16Array.prototype.reduce === "function" && typeof Uint16Array.prototype.reduce === "function" && typeof Int32Array.prototype.reduce === "function" && typeof Uint32Array.prototype.reduce === "function" && typeof Float32Array.prototype.reduce === "function" && typeof Float64Array.prototype.reduce === "function";
}
ยง%TypedArray%.prototype.reduceRight
?
function(){
return typeof Int8Array.prototype.reduceRight === "function" && typeof Uint8Array.prototype.reduceRight === "function" && typeof Uint8ClampedArray.prototype.reduceRight === "function" && typeof Int16Array.prototype.reduceRight === "function" && typeof Uint16Array.prototype.reduceRight === "function" && typeof Int32Array.prototype.reduceRight === "function" && typeof Uint32Array.prototype.reduceRight === "function" && typeof Float32Array.prototype.reduceRight === "function" && typeof Float64Array.prototype.reduceRight === "function";
}
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.reduceRight === "function" && typeof Uint8Array.prototype.reduceRight === "function" && typeof Uint8ClampedArray.prototype.reduceRight === "function" && typeof Int16Array.prototype.reduceRight === "function" && typeof Uint16Array.prototype.reduceRight === "function" && typeof Int32Array.prototype.reduceRight === "function" && typeof Uint32Array.prototype.reduceRight === "function" && typeof Float32Array.prototype.reduceRight === "function" && typeof Float64Array.prototype.reduceRight === "function";
}
ยง%TypedArray%.prototype.reverse
?
function(){
return typeof Int8Array.prototype.reverse === "function" && typeof Uint8Array.prototype.reverse === "function" && typeof Uint8ClampedArray.prototype.reverse === "function" && typeof Int16Array.prototype.reverse === "function" && typeof Uint16Array.prototype.reverse === "function" && typeof Int32Array.prototype.reverse === "function" && typeof Uint32Array.prototype.reverse === "function" && typeof Float32Array.prototype.reverse === "function" && typeof Float64Array.prototype.reverse === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.reverse === "function" && typeof Uint8Array.prototype.reverse === "function" && typeof Uint8ClampedArray.prototype.reverse === "function" && typeof Int16Array.prototype.reverse === "function" && typeof Uint16Array.prototype.reverse === "function" && typeof Int32Array.prototype.reverse === "function" && typeof Uint32Array.prototype.reverse === "function" && typeof Float32Array.prototype.reverse === "function" && typeof Float64Array.prototype.reverse === "function";
}
ยง%TypedArray%.prototype.some
?
function(){
return typeof Int8Array.prototype.some === "function" && typeof Uint8Array.prototype.some === "function" && typeof Uint8ClampedArray.prototype.some === "function" && typeof Int16Array.prototype.some === "function" && typeof Uint16Array.prototype.some === "function" && typeof Int32Array.prototype.some === "function" && typeof Uint32Array.prototype.some === "function" && typeof Float32Array.prototype.some === "function" && typeof Float64Array.prototype.some === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.some === "function" && typeof Uint8Array.prototype.some === "function" && typeof Uint8ClampedArray.prototype.some === "function" && typeof Int16Array.prototype.some === "function" && typeof Uint16Array.prototype.some === "function" && typeof Int32Array.prototype.some === "function" && typeof Uint32Array.prototype.some === "function" && typeof Float32Array.prototype.some === "function" && typeof Float64Array.prototype.some === "function";
}
ยง%TypedArray%.prototype.sort
?
function(){
return typeof Int8Array.prototype.sort === "function" && typeof Uint8Array.prototype.sort === "function" && typeof Uint8ClampedArray.prototype.sort === "function" && typeof Int16Array.prototype.sort === "function" && typeof Uint16Array.prototype.sort === "function" && typeof Int32Array.prototype.sort === "function" && typeof Uint32Array.prototype.sort === "function" && typeof Float32Array.prototype.sort === "function" && typeof Float64Array.prototype.sort === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.sort === "function" && typeof Uint8Array.prototype.sort === "function" && typeof Uint8ClampedArray.prototype.sort === "function" && typeof Int16Array.prototype.sort === "function" && typeof Uint16Array.prototype.sort === "function" && typeof Int32Array.prototype.sort === "function" && typeof Uint32Array.prototype.sort === "function" && typeof Float32Array.prototype.sort === "function" && typeof Float64Array.prototype.sort === "function";
}
ยง%TypedArray%.prototype.copyWithin
?
function(){
return typeof Int8Array.prototype.copyWithin === "function" && typeof Uint8Array.prototype.copyWithin === "function" && typeof Uint8ClampedArray.prototype.copyWithin === "function" && typeof Int16Array.prototype.copyWithin === "function" && typeof Uint16Array.prototype.copyWithin === "function" && typeof Int32Array.prototype.copyWithin === "function" && typeof Uint32Array.prototype.copyWithin === "function" && typeof Float32Array.prototype.copyWithin === "function" && typeof Float64Array.prototype.copyWithin === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.copyWithin === "function" && typeof Uint8Array.prototype.copyWithin === "function" && typeof Uint8ClampedArray.prototype.copyWithin === "function" && typeof Int16Array.prototype.copyWithin === "function" && typeof Uint16Array.prototype.copyWithin === "function" && typeof Int32Array.prototype.copyWithin === "function" && typeof Uint32Array.prototype.copyWithin === "function" && typeof Float32Array.prototype.copyWithin === "function" && typeof Float64Array.prototype.copyWithin === "function";
}
ยง%TypedArray%.prototype.find
?
function(){
return typeof Int8Array.prototype.find === "function" && typeof Uint8Array.prototype.find === "function" && typeof Uint8ClampedArray.prototype.find === "function" && typeof Int16Array.prototype.find === "function" && typeof Uint16Array.prototype.find === "function" && typeof Int32Array.prototype.find === "function" && typeof Uint32Array.prototype.find === "function" && typeof Float32Array.prototype.find === "function" && typeof Float64Array.prototype.find === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.find === "function" && typeof Uint8Array.prototype.find === "function" && typeof Uint8ClampedArray.prototype.find === "function" && typeof Int16Array.prototype.find === "function" && typeof Uint16Array.prototype.find === "function" && typeof Int32Array.prototype.find === "function" && typeof Uint32Array.prototype.find === "function" && typeof Float32Array.prototype.find === "function" && typeof Float64Array.prototype.find === "function";
}
ยง%TypedArray%.prototype.findIndex
?
function(){
return typeof Int8Array.prototype.findIndex === "function" && typeof Uint8Array.prototype.findIndex === "function" && typeof Uint8ClampedArray.prototype.findIndex === "function" && typeof Int16Array.prototype.findIndex === "function" && typeof Uint16Array.prototype.findIndex === "function" && typeof Int32Array.prototype.findIndex === "function" && typeof Uint32Array.prototype.findIndex === "function" && typeof Float32Array.prototype.findIndex === "function" && typeof Float64Array.prototype.findIndex === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.findIndex === "function" && typeof Uint8Array.prototype.findIndex === "function" && typeof Uint8ClampedArray.prototype.findIndex === "function" && typeof Int16Array.prototype.findIndex === "function" && typeof Uint16Array.prototype.findIndex === "function" && typeof Int32Array.prototype.findIndex === "function" && typeof Uint32Array.prototype.findIndex === "function" && typeof Float32Array.prototype.findIndex === "function" && typeof Float64Array.prototype.findIndex === "function";
}
ยง%TypedArray%.prototype.fill
?
function(){
return typeof Int8Array.prototype.fill === "function" && typeof Uint8Array.prototype.fill === "function" && typeof Uint8ClampedArray.prototype.fill === "function" && typeof Int16Array.prototype.fill === "function" && typeof Uint16Array.prototype.fill === "function" && typeof Int32Array.prototype.fill === "function" && typeof Uint32Array.prototype.fill === "function" && typeof Float32Array.prototype.fill === "function" && typeof Float64Array.prototype.fill === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Int8Array.prototype.fill === "function" && typeof Uint8Array.prototype.fill === "function" && typeof Uint8ClampedArray.prototype.fill === "function" && typeof Int16Array.prototype.fill === "function" && typeof Uint16Array.prototype.fill === "function" && typeof Int32Array.prototype.fill === "function" && typeof Uint32Array.prototype.fill === "function" && typeof Float32Array.prototype.fill === "function" && typeof Float64Array.prototype.fill === "function";
}
ยง%TypedArray%.prototype.keys
?
function(){
return typeof Int8Array.prototype.keys === "function" && typeof Uint8Array.prototype.keys === "function" && typeof Uint8ClampedArray.prototype.keys === "function" && typeof Int16Array.prototype.keys === "function" && typeof Uint16Array.prototype.keys === "function" && typeof Int32Array.prototype.keys === "function" && typeof Uint32Array.prototype.keys === "function" && typeof Float32Array.prototype.keys === "function" && typeof Float64Array.prototype.keys === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Int8Array.prototype.keys === "function" && typeof Uint8Array.prototype.keys === "function" && typeof Uint8ClampedArray.prototype.keys === "function" && typeof Int16Array.prototype.keys === "function" && typeof Uint16Array.prototype.keys === "function" && typeof Int32Array.prototype.keys === "function" && typeof Uint32Array.prototype.keys === "function" && typeof Float32Array.prototype.keys === "function" && typeof Float64Array.prototype.keys === "function";
}
ยง%TypedArray%.prototype.values
?
function(){
return typeof Int8Array.prototype.values === "function" && typeof Uint8Array.prototype.values === "function" && typeof Uint8ClampedArray.prototype.values === "function" && typeof Int16Array.prototype.values === "function" && typeof Uint16Array.prototype.values === "function" && typeof Int32Array.prototype.values === "function" && typeof Uint32Array.prototype.values === "function" && typeof Float32Array.prototype.values === "function" && typeof Float64Array.prototype.values === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Int8Array.prototype.values === "function" && typeof Uint8Array.prototype.values === "function" && typeof Uint8ClampedArray.prototype.values === "function" && typeof Int16Array.prototype.values === "function" && typeof Uint16Array.prototype.values === "function" && typeof Int32Array.prototype.values === "function" && typeof Uint32Array.prototype.values === "function" && typeof Float32Array.prototype.values === "function" && typeof Float64Array.prototype.values === "function";
}
ยง%TypedArray%.prototype.entries
?
function(){
return typeof Int8Array.prototype.entries === "function" && typeof Uint8Array.prototype.entries === "function" && typeof Uint8ClampedArray.prototype.entries === "function" && typeof Int16Array.prototype.entries === "function" && typeof Uint16Array.prototype.entries === "function" && typeof Int32Array.prototype.entries === "function" && typeof Uint32Array.prototype.entries === "function" && typeof Float32Array.prototype.entries === "function" && typeof Float64Array.prototype.entries === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Int8Array.prototype.entries === "function" && typeof Uint8Array.prototype.entries === "function" && typeof Uint8ClampedArray.prototype.entries === "function" && typeof Int16Array.prototype.entries === "function" && typeof Uint16Array.prototype.entries === "function" && typeof Int32Array.prototype.entries === "function" && typeof Uint32Array.prototype.entries === "function" && typeof Float32Array.prototype.entries === "function" && typeof Float64Array.prototype.entries === "function";
}
ยง%TypedArray%.prototype[Symbol.iterator]
?
function(){
return typeof Int8Array.prototype[Symbol.iterator] === "function" && typeof Uint8Array.prototype[Symbol.iterator] === "function" && typeof Uint8ClampedArray.prototype[Symbol.iterator] === "function" && typeof Int16Array.prototype[Symbol.iterator] === "function" && typeof Uint16Array.prototype[Symbol.iterator] === "function" && typeof Int32Array.prototype[Symbol.iterator] === "function" && typeof Uint32Array.prototype[Symbol.iterator] === "function" && typeof Float32Array.prototype[Symbol.iterator] === "function" && typeof Float64Array.prototype[Symbol.iterator] === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return typeof Int8Array.prototype[Symbol.iterator] === "function" && typeof Uint8Array.prototype[Symbol.iterator] === "function" && typeof Uint8ClampedArray.prototype[Symbol.iterator] === "function" && typeof Int16Array.prototype[Symbol.iterator] === "function" && typeof Uint16Array.prototype[Symbol.iterator] === "function" && typeof Int32Array.prototype[Symbol.iterator] === "function" && typeof Uint32Array.prototype[Symbol.iterator] === "function" && typeof Float32Array.prototype[Symbol.iterator] === "function" && typeof Float64Array.prototype[Symbol.iterator] === "function";
}
ยง%TypedArray%[Symbol.species]
?
function(){
return typeof Int8Array[Symbol.species] === "function" && typeof Uint8Array[Symbol.species] === "function" && typeof Uint8ClampedArray[Symbol.species] === "function" && typeof Int16Array[Symbol.species] === "function" && typeof Uint16Array[Symbol.species] === "function" && typeof Int32Array[Symbol.species] === "function" && typeof Uint32Array[Symbol.species] === "function" && typeof Float32Array[Symbol.species] === "function" && typeof Float64Array[Symbol.species] === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
return typeof Int8Array[Symbol.species] === "function" && typeof Uint8Array[Symbol.species] === "function" && typeof Uint8ClampedArray[Symbol.species] === "function" && typeof Int16Array[Symbol.species] === "function" && typeof Uint16Array[Symbol.species] === "function" && typeof Int32Array[Symbol.species] === "function" && typeof Uint32Array[Symbol.species] === "function" && typeof Float32Array[Symbol.species] === "function" && typeof Float64Array[Symbol.species] === "function";
}

Map

ยงbasic functionality
?
function(){
var key = {}; var map = new Map(); map.set(key, 123); return map.has(key) && map.get(key) === 123;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
function(){
var key = {}; var map = new Map(); map.set(key, 123); return map.has(key) && map.get(key) === 123;
}
ยงconstructor arguments
?
function(){
var key1 = {}; var key2 = {}; var map = new Map([[key1, 123], [key2, 456]]); return map.has(key1) && map.get(key1) === 123 && map.has(key2) && map.get(key2) === 456;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
var key1 = {}; var key2 = {}; var map = new Map([[key1, 123], [key2, 456]]); return map.has(key1) && map.get(key1) === 123 && map.has(key2) && map.get(key2) === 456;
}
ยงconstructor requires new
?
function(){
new Map(); try { Map(); return false; } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
new Map(); try { Map(); return false; } catch(e) { return true; }
}
ยงconstructor accepts null
?
function(){
new Map(null); return true;
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Error
Flag
function(){
new Map(null); return true;
}
ยงconstructor invokes set
?
function(){
var passed = false; var _set = Map.prototype.set; Map.prototype.set = function(k, v) { passed = true; }; new Map([ [1, 2] ]); Map.prototype.set = _set; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
No
function(){
var passed = false; var _set = Map.prototype.set; Map.prototype.set = function(k, v) { passed = true; }; new Map([ [1, 2] ]); Map.prototype.set = _set; return passed;
}
ยงiterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { new Map(iter); } catch(e){} return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { new Map(iter); } catch(e){} return closed;
}
ยงMap.prototype.set returns this
?
function(){
var map = new Map(); return map.set(0, 0) === map;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
var map = new Map(); return map.set(0, 0) === map;
}
ยง-0 key converts to +0
?
function(){
var map = new Map(); map.set(-0, "foo"); var k; map.forEach(function (value, key) { k = 1 / key; }); return k === Infinity && map.get(+0) === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
No
No
Error
Error
function(){
var map = new Map(); map.set(-0, "foo"); var k; map.forEach(function (value, key) { k = 1 / key; }); return k === Infinity && map.get(+0) === "foo";
}
ยงMap.prototype.size
?
function(){
var key = {}; var map = new Map(); map.set(key, 123); return map.size === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
var key = {}; var map = new Map(); map.set(key, 123); return map.size === 1;
}
ยงMap.prototype.delete
?
function(){
return typeof Map.prototype.delete === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Flag
function(){
return typeof Map.prototype.delete === "function";
}
ยงMap.prototype.clear
?
function(){
return typeof Map.prototype.clear === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Map.prototype.clear === "function";
}
ยงMap.prototype.forEach
?
function(){
return typeof Map.prototype.forEach === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Map.prototype.forEach === "function";
}
ยงMap.prototype.keys
?
function(){
return typeof Map.prototype.keys === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Error
No
function(){
return typeof Map.prototype.keys === "function";
}
ยงMap.prototype.values
?
function(){
return typeof Map.prototype.values === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Map.prototype.values === "function";
}
ยงMap.prototype.entries
?
function(){
return typeof Map.prototype.entries === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Map.prototype.entries === "function";
}
ยงMap.prototype[Symbol.iterator]
?
function(){
return typeof Map.prototype[Symbol.iterator] === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return typeof Map.prototype[Symbol.iterator] === "function";
}
ยงMap.prototype isn't an instance
?
function(){
new Map(); var obj = {}; try { Map.prototype.has(obj); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
function(){
new Map(); var obj = {}; try { Map.prototype.has(obj); } catch(e) { return true; }
}
ยงMap iterator prototype chain
?
function(){
// Iterator instance var iterator = new Map()[Symbol.iterator](); // %MapIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
function(){
// Iterator instance var iterator = new Map()[Symbol.iterator](); // %MapIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}
ยงMap[Symbol.species]
?
function(){
var prop = Object.getOwnPropertyDescriptor(Map, Symbol.species); return 'get' in prop && Map[Symbol.species] === Map;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var prop = Object.getOwnPropertyDescriptor(Map, Symbol.species); return 'get' in prop && Map[Symbol.species] === Map;
}

Set

ยงbasic functionality
?
function(){
var obj = {}; var set = new Set(); set.add(123); set.add(123); return set.has(123);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
function(){
var obj = {}; var set = new Set(); set.add(123); set.add(123); return set.has(123);
}
ยงconstructor arguments
?
function(){
var obj1 = {}; var obj2 = {}; var set = new Set([obj1, obj2]); return set.has(obj1) && set.has(obj2);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
var obj1 = {}; var obj2 = {}; var set = new Set([obj1, obj2]); return set.has(obj1) && set.has(obj2);
}
ยงconstructor requires new
?
function(){
new Set(); try { Set(); return false; } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
new Set(); try { Set(); return false; } catch(e) { return true; }
}
ยงconstructor accepts null
?
function(){
new Set(null); return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Error
Flag
function(){
new Set(null); return true;
}
ยงconstructor invokes add
?
function(){
var passed = false; var _add = Set.prototype.add; Set.prototype.add = function(v) { passed = true; }; new Set([1]); Set.prototype.add = _add; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Error
No
function(){
var passed = false; var _add = Set.prototype.add; Set.prototype.add = function(v) { passed = true; }; new Set([1]); Set.prototype.add = _add; return passed;
}
ยงiterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); var add = Set.prototype.add; Set.prototype.add = function(){ throw 0 }; try { new Set(iter); } catch(e){} Set.prototype.add = add; return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Error
No
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); var add = Set.prototype.add; Set.prototype.add = function(){ throw 0 }; try { new Set(iter); } catch(e){} Set.prototype.add = add; return closed;
}
ยงSet.prototype.add returns this
?
function(){
var set = new Set(); return set.add(0) === set;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
var set = new Set(); return set.add(0) === set;
}
ยง-0 key converts to +0
?
function(){
var set = new Set(); set.add(-0); var k; set.forEach(function (value) { k = 1 / value; }); return k === Infinity && set.has(+0);
}
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
No
No
Error
Error
function(){
var set = new Set(); set.add(-0); var k; set.forEach(function (value) { k = 1 / value; }); return k === Infinity && set.has(+0);
}
ยงSet.prototype.size
?
function(){
var obj = {}; var set = new Set(); set.add(123); set.add(123); set.add(456); return set.size === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
var obj = {}; var set = new Set(); set.add(123); set.add(123); set.add(456); return set.size === 2;
}
ยงSet.prototype.delete
?
function(){
return typeof Set.prototype.delete === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Error
Flag
function(){
return typeof Set.prototype.delete === "function";
}
ยงSet.prototype.clear
?
function(){
return typeof Set.prototype.clear === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Set.prototype.clear === "function";
}
ยงSet.prototype.forEach
?
function(){
return typeof Set.prototype.forEach === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Set.prototype.forEach === "function";
}
ยงSet.prototype.keys
?
function(){
return typeof Set.prototype.keys === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Error
No
function(){
return typeof Set.prototype.keys === "function";
}
ยงSet.prototype.values
?
function(){
return typeof Set.prototype.values === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Set.prototype.values === "function";
}
ยงSet.prototype.entries
?
function(){
return typeof Set.prototype.entries === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
No
function(){
return typeof Set.prototype.entries === "function";
}
ยงSet.prototype[Symbol.iterator]
?
function(){
return typeof Set.prototype[Symbol.iterator] === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return typeof Set.prototype[Symbol.iterator] === "function";
}
ยงSet.prototype isn't an instance
?
function(){
new Set(); var obj = {}; try { Set.prototype.has(obj); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
function(){
new Set(); var obj = {}; try { Set.prototype.has(obj); } catch(e) { return true; }
}
ยงSet iterator prototype chain
?
function(){
// Iterator instance var iterator = new Set()[Symbol.iterator](); // %SetIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
function(){
// Iterator instance var iterator = new Set()[Symbol.iterator](); // %SetIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}
ยงSet[Symbol.species]
?
function(){
var prop = Object.getOwnPropertyDescriptor(Set, Symbol.species); return 'get' in prop && Set[Symbol.species] === Set;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var prop = Object.getOwnPropertyDescriptor(Set, Symbol.species); return 'get' in prop && Set[Symbol.species] === Set;
}

WeakMap

ยงbasic functionality
?
function(){
var key = {}; var weakmap = new WeakMap(); weakmap.set(key, 123); return weakmap.has(key) && weakmap.get(key) === 123;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
function(){
var key = {}; var weakmap = new WeakMap(); weakmap.set(key, 123); return weakmap.has(key) && weakmap.get(key) === 123;
}
ยงconstructor arguments
?
function(){
var key1 = {}; var key2 = {}; var weakmap = new WeakMap([[key1, 123], [key2, 456]]); return weakmap.has(key1) && weakmap.get(key1) === 123 && weakmap.has(key2) && weakmap.get(key2) === 456;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
No
function(){
var key1 = {}; var key2 = {}; var weakmap = new WeakMap([[key1, 123], [key2, 456]]); return weakmap.has(key1) && weakmap.get(key1) === 123 && weakmap.has(key2) && weakmap.get(key2) === 456;
}
ยงconstructor requires new
?
function(){
new WeakMap(); try { WeakMap(); return false; } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Error
No
function(){
new WeakMap(); try { WeakMap(); return false; } catch(e) { return true; }
}
ยงconstructor accepts null
?
function(){
new WeakMap(null); return true;
}
Yes
Yes
Yes
Yes
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Error
Flag
function(){
new WeakMap(null); return true;
}
ยงconstructor invokes set
?
function(){
var passed = false; var _set = WeakMap.prototype.set; WeakMap.prototype.set = function(k, v) { passed = true; }; new WeakMap([ [{ }, 42] ]); WeakMap.prototype.set = _set; return passed;
}
Yes
Yes
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Yes
Yes
Error
No
function(){
var passed = false; var _set = WeakMap.prototype.set; WeakMap.prototype.set = function(k, v) { passed = true; }; new WeakMap([ [{ }, 42] ]); WeakMap.prototype.set = _set; return passed;
}
ยงfrozen objects as keys
?
function(){
var f = Object.freeze({}); var m = new WeakMap; m.set(f, 42); return m.get(f) === 42;
}
Yes
Yes
Yes
Yes
Yes
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Error
Flag
function(){
var f = Object.freeze({}); var m = new WeakMap; m.set(f, 42); return m.get(f) === 42;
}
ยงiterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { new WeakMap(iter); } catch(e){} return closed;
}
Yes
Yes
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No
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No
No
No
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { new WeakMap(iter); } catch(e){} return closed;
}
ยงWeakMap.prototype.set returns this
?
function(){
var weakmap = new WeakMap(); var key = {}; return weakmap.set(key, 0) === weakmap;
}
Yes
Yes
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Error
No
function(){
var weakmap = new WeakMap(); var key = {}; return weakmap.set(key, 0) === weakmap;
}
ยงWeakMap.prototype.delete
?
function(){
return typeof WeakMap.prototype.delete === "function";
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Error
Flag
function(){
return typeof WeakMap.prototype.delete === "function";
}
ยงno WeakMap.prototype.clear method
?
function(){
if (!("clear" in WeakMap.prototype)) { return true; } var m = new WeakMap(); var key = {}; m.set(key, 2); m.clear(); return m.has(key);
}
Yes
Yes
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No
No
Error
Flag
function(){
if (!("clear" in WeakMap.prototype)) { return true; } var m = new WeakMap(); var key = {}; m.set(key, 2); m.clear(); return m.has(key);
}
ยง.has, .get and .delete methods accept primitives
?
function(){
var m = new WeakMap; return m.has(1) === false && m.get(1) === void undefined && m.delete(1) === false;
}
Yes
Yes
Yes
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Yes
Error
Error
Error
Error
function(){
var m = new WeakMap; return m.has(1) === false && m.get(1) === void undefined && m.delete(1) === false;
}
ยงWeakMap.prototype isn't an instance
?
function(){
new WeakMap(); var obj = {}; try { WeakMap.prototype.has(obj); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Error
Flag
function(){
new WeakMap(); var obj = {}; try { WeakMap.prototype.has(obj); } catch(e) { return true; }
}

WeakSet

ยงbasic functionality
?
function(){
var obj1 = {}; var weakset = new WeakSet(); weakset.add(obj1); weakset.add(obj1); return weakset.has(obj1);
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Error
function(){
var obj1 = {}; var weakset = new WeakSet(); weakset.add(obj1); weakset.add(obj1); return weakset.has(obj1);
}
ยงconstructor arguments
?
function(){
var obj1 = {}, obj2 = {}; var weakset = new WeakSet([obj1, obj2]); return weakset.has(obj1) && weakset.has(obj2);
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Error
Error
function(){
var obj1 = {}, obj2 = {}; var weakset = new WeakSet([obj1, obj2]); return weakset.has(obj1) && weakset.has(obj2);
}
ยงconstructor requires new
?
function(){
new WeakSet(); try { WeakSet(); return false; } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
new WeakSet(); try { WeakSet(); return false; } catch(e) { return true; }
}
ยงconstructor accepts null
?
function(){
new WeakSet(null); return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
new WeakSet(null); return true;
}
ยงconstructor invokes add
?
function(){
var passed = false; var _add = WeakSet.prototype.add; WeakSet.prototype.add = function(v) { passed = true; }; new WeakSet([ { } ]); WeakSet.prototype.add = _add; return passed;
}
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Error
Error
function(){
var passed = false; var _add = WeakSet.prototype.add; WeakSet.prototype.add = function(v) { passed = true; }; new WeakSet([ { } ]); WeakSet.prototype.add = _add; return passed;
}
ยงiterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { new WeakSet(iter); } catch(e){} return closed;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
No
No
No
No
No
No
No
No
No
No
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { new WeakSet(iter); } catch(e){} return closed;
}
ยงWeakSet.prototype.add returns this
?
function(){
var weakset = new WeakSet(); var obj = {}; return weakset.add(obj) === weakset;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var weakset = new WeakSet(); var obj = {}; return weakset.add(obj) === weakset;
}
ยงWeakSet.prototype.delete
?
function(){
return typeof WeakSet.prototype.delete === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return typeof WeakSet.prototype.delete === "function";
}
ยงno WeakSet.prototype.clear method
?
function(){
if (!("clear" in WeakSet.prototype)) { return true; } var s = new WeakSet(); var key = {}; s.add(key); s.clear(); return s.has(key);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
No
No
Error
Error
function(){
if (!("clear" in WeakSet.prototype)) { return true; } var s = new WeakSet(); var key = {}; s.add(key); s.clear(); return s.has(key);
}
ยง.has and .delete methods accept primitives
?
function(){
var s = new WeakSet; return s.has(1) === false && s.delete(1) === false;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var s = new WeakSet; return s.has(1) === false && s.delete(1) === false;
}
ยงWeakSet.prototype isn't an instance
?
function(){
new WeakSet(); var obj = {}; try { WeakSet.prototype.has(obj); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
new WeakSet(); var obj = {}; try { WeakSet.prototype.has(obj); } catch(e) { return true; }
}

Proxy

ยงconstructor requires new
?
function(){
new Proxy({}, {}); try { Proxy({}, {}); return false; } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
new Proxy({}, {}); try { Proxy({}, {}); return false; } catch(e) { return true; }
}
ยงno "prototype" property
?
function(){
new Proxy({}, {}); return !Proxy.hasOwnProperty('prototype');
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
new Proxy({}, {}); return !Proxy.hasOwnProperty('prototype');
}
ยง"get" handler
?
function(){
var proxied = { }; var proxy = new Proxy(proxied, { get: function (t, k, r) { return t === proxied && k === "foo" && r === proxy && 5; } }); return proxy.foo === 5;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = { }; var proxy = new Proxy(proxied, { get: function (t, k, r) { return t === proxied && k === "foo" && r === proxy && 5; } }); return proxy.foo === 5;
}
ยง"get" handler, instances of proxies
?
function(){
var proxied = { }; var proxy = Object.create(new Proxy(proxied, { get: function (t, k, r) { return t === proxied && k === "foo" && r === proxy && 5; } })); return proxy.foo === 5;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = { }; var proxy = Object.create(new Proxy(proxied, { get: function (t, k, r) { return t === proxied && k === "foo" && r === proxy && 5; } })); return proxy.foo === 5;
}
ยง"get" handler invariants
?
function(){
var passed = false; var proxied = { }; var proxy = new Proxy(proxied, { get: function () { passed = true; return 4; } }); // The value reported for a property must be the same as the value of the corresponding // target object property if the target object property is a non-writable, // non-configurable own data property. Object.defineProperty(proxied, "foo", { value: 5, enumerable: true }); try { proxy.foo; return false; } catch(e) {} // The value reported for a property must be undefined if the corresponding target // object property is a non-configurable own accessor property that has undefined // as its [[Get]] attribute. Object.defineProperty(proxied, "bar", { set: function(){}, enumerable: true }); try { proxy.bar; return false; } catch(e) {} return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var passed = false; var proxied = { }; var proxy = new Proxy(proxied, { get: function () { passed = true; return 4; } }); // The value reported for a property must be the same as the value of the corresponding // target object property if the target object property is a non-writable, // non-configurable own data property. Object.defineProperty(proxied, "foo", { value: 5, enumerable: true }); try { proxy.foo; return false; } catch(e) {} // The value reported for a property must be undefined if the corresponding target // object property is a non-configurable own accessor property that has undefined // as its [[Get]] attribute. Object.defineProperty(proxied, "bar", { set: function(){}, enumerable: true }); try { proxy.bar; return false; } catch(e) {} return passed;
}
ยง"set" handler
?
function(){
var proxied = { }; var passed = false; var proxy = new Proxy(proxied, { set: function (t, k, v, r) { passed = t === proxied && k + v === "foobar" && r === proxy; } }); proxy.foo = "bar"; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = { }; var passed = false; var proxy = new Proxy(proxied, { set: function (t, k, v, r) { passed = t === proxied && k + v === "foobar" && r === proxy; } }); proxy.foo = "bar"; return passed;
}
ยง"set" handler, instances of proxies
?
function(){
var proxied = { }; var passed = false; var proxy = Object.create(new Proxy(proxied, { set: function (t, k, v, r) { passed = t === proxied && k + v === "foobar" && r === proxy; } })); proxy.foo = "bar"; return passed;
}
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = { }; var passed = false; var proxy = Object.create(new Proxy(proxied, { set: function (t, k, v, r) { passed = t === proxied && k + v === "foobar" && r === proxy; } })); proxy.foo = "bar"; return passed;
}
ยง"set" handler invariants
?
function(){
var passed = false; new Proxy({},{}); // Cannot change the value of a property to be different from the value of // the corresponding target object if the corresponding target object // property is a non-writable, non-configurable own data property. var proxied = {}; var proxy = new Proxy(proxied, { set: function () { passed = true; return true; } }); Object.defineProperty(proxied, "foo", { value: 2, enumerable: true }); proxy.foo = 2; try { proxy.foo = 4; return false; } catch(e) {} // Cannot set the value of a property if the corresponding target // object property is a non-configurable own accessor property // that has undefined as its [[Set]] attribute. Object.defineProperty(proxied, "bar", { get: function(){}, enumerable: true }); try { proxy.bar = 2; return false; } catch(e) {} return passed;
}
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new Proxy({},{}); // Cannot change the value of a property to be different from the value of // the corresponding target object if the corresponding target object // property is a non-writable, non-configurable own data property. var proxied = {}; var proxy = new Proxy(proxied, { set: function () { passed = true; return true; } }); Object.defineProperty(proxied, "foo", { value: 2, enumerable: true }); proxy.foo = 2; try { proxy.foo = 4; return false; } catch(e) {} // Cannot set the value of a property if the corresponding target // object property is a non-configurable own accessor property // that has undefined as its [[Set]] attribute. Object.defineProperty(proxied, "bar", { get: function(){}, enumerable: true }); try { proxy.bar = 2; return false; } catch(e) {} return passed;
}
ยง"has" handler
?
function(){
var proxied = {}; var passed = false; "foo" in new Proxy(proxied, { has: function (t, k) { passed = t === proxied && k === "foo"; } }); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = {}; var passed = false; "foo" in new Proxy(proxied, { has: function (t, k) { passed = t === proxied && k === "foo"; } }); return passed;
}
ยง"has" handler, instances of proxies
?
function(){
var proxied = {}; var passed = false; "foo" in Object.create(new Proxy(proxied, { has: function (t, k) { passed = t === proxied && k === "foo"; } })); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = {}; var passed = false; "foo" in Object.create(new Proxy(proxied, { has: function (t, k) { passed = t === proxied && k === "foo"; } })); return passed;
}
ยง"has" handler invariants
?
function(){
var passed = false; new Proxy({},{}); // A property cannot be reported as non-existent, if it exists as a // non-configurable own property of the target object. var proxied = {}; var proxy = new Proxy(proxied, { has: function () { passed = true; return false; } }); Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { 'foo' in proxy; return false; } catch(e) {} // A property cannot be reported as non-existent, if it exists as an // own property of the target object and the target object is not extensible. proxied.bar = 2; Object.preventExtensions(proxied); try { 'bar' in proxy; return false; } catch(e) {} return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new Proxy({},{}); // A property cannot be reported as non-existent, if it exists as a // non-configurable own property of the target object. var proxied = {}; var proxy = new Proxy(proxied, { has: function () { passed = true; return false; } }); Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { 'foo' in proxy; return false; } catch(e) {} // A property cannot be reported as non-existent, if it exists as an // own property of the target object and the target object is not extensible. proxied.bar = 2; Object.preventExtensions(proxied); try { 'bar' in proxy; return false; } catch(e) {} return passed;
}
ยง"deleteProperty" handler
?
function(){
var proxied = {}; var passed = false; delete new Proxy(proxied, { deleteProperty: function (t, k) { passed = t === proxied && k === "foo"; } }).foo; return passed;
}
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = {}; var passed = false; delete new Proxy(proxied, { deleteProperty: function (t, k) { passed = t === proxied && k === "foo"; } }).foo; return passed;
}
ยง"deleteProperty" handler invariant
?
function(){
var passed = false; new Proxy({},{}); // A property cannot be reported as deleted, if it exists as a non-configurable // own property of the target object. var proxied = {}; Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { delete new Proxy(proxied, { deleteProperty: function () { passed = true; return true; } }).foo; return false; } catch(e) {} return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new Proxy({},{}); // A property cannot be reported as deleted, if it exists as a non-configurable // own property of the target object. var proxied = {}; Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { delete new Proxy(proxied, { deleteProperty: function () { passed = true; return true; } }).foo; return false; } catch(e) {} return passed;
}
ยง"getOwnPropertyDescriptor" handler
?
function(){
var proxied = {}; var fakeDesc = { value: "foo", configurable: true }; var returnedDesc = Object.getOwnPropertyDescriptor( new Proxy(proxied, { getOwnPropertyDescriptor: function (t, k) { return t === proxied && k === "foo" && fakeDesc; } }), "foo" ); return (returnedDesc.value === fakeDesc.value && returnedDesc.configurable === fakeDesc.configurable && returnedDesc.writable === false && returnedDesc.enumerable === false);
}
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Error
Error
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Error
function(){
var proxied = {}; var fakeDesc = { value: "foo", configurable: true }; var returnedDesc = Object.getOwnPropertyDescriptor( new Proxy(proxied, { getOwnPropertyDescriptor: function (t, k) { return t === proxied && k === "foo" && fakeDesc; } }), "foo" ); return (returnedDesc.value === fakeDesc.value && returnedDesc.configurable === fakeDesc.configurable && returnedDesc.writable === false && returnedDesc.enumerable === false);
}
ยง"getOwnPropertyDescriptor" handler invariants
?
function(){
var passed = false; new Proxy({},{}); // A property cannot be reported as non-existent, if it exists as a non-configurable // own property of the target object. var proxied = {}; var proxy = new Proxy(proxied, { getOwnPropertyDescriptor: function () { passed = true; return undefined; } }); Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { Object.getOwnPropertyDescriptor(proxy, "foo"); return false; } catch(e) {} // A property cannot be reported as non-existent, if it exists as an own property // of the target object and the target object is not extensible. proxied.bar = 3; Object.preventExtensions(proxied); try { Object.getOwnPropertyDescriptor(proxy, "bar"); return false; } catch(e) {} // A property cannot be reported as existent, if it does not exists as an own property // of the target object and the target object is not extensible. try { Object.getOwnPropertyDescriptor(new Proxy(proxied, { getOwnPropertyDescriptor: function() { return { value: 2, configurable: true, writable: true, enumerable: true }; }}), "baz"); return false; } catch(e) {} // A property cannot be reported as non-configurable, if it does not exists as an own // property of the target object or if it exists as a configurable own property of // the target object. try { Object.getOwnPropertyDescriptor(new Proxy({}, { getOwnPropertyDescriptor: function() { return { value: 2, configurable: false, writable: true, enumerable: true }; }}), "baz"); return false; } catch(e) {} try { Object.getOwnPropertyDescriptor(new Proxy({baz:1}, { getOwnPropertyDescriptor: function() { return { value: 1, configurable: false, writable: true, enumerable: true }; }}), "baz"); return false; } catch(e) {} return passed;
}
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Error
Error
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Error
function(){
var passed = false; new Proxy({},{}); // A property cannot be reported as non-existent, if it exists as a non-configurable // own property of the target object. var proxied = {}; var proxy = new Proxy(proxied, { getOwnPropertyDescriptor: function () { passed = true; return undefined; } }); Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { Object.getOwnPropertyDescriptor(proxy, "foo"); return false; } catch(e) {} // A property cannot be reported as non-existent, if it exists as an own property // of the target object and the target object is not extensible. proxied.bar = 3; Object.preventExtensions(proxied); try { Object.getOwnPropertyDescriptor(proxy, "bar"); return false; } catch(e) {} // A property cannot be reported as existent, if it does not exists as an own property // of the target object and the target object is not extensible. try { Object.getOwnPropertyDescriptor(new Proxy(proxied, { getOwnPropertyDescriptor: function() { return { value: 2, configurable: true, writable: true, enumerable: true }; }}), "baz"); return false; } catch(e) {} // A property cannot be reported as non-configurable, if it does not exists as an own // property of the target object or if it exists as a configurable own property of // the target object. try { Object.getOwnPropertyDescriptor(new Proxy({}, { getOwnPropertyDescriptor: function() { return { value: 2, configurable: false, writable: true, enumerable: true }; }}), "baz"); return false; } catch(e) {} try { Object.getOwnPropertyDescriptor(new Proxy({baz:1}, { getOwnPropertyDescriptor: function() { return { value: 1, configurable: false, writable: true, enumerable: true }; }}), "baz"); return false; } catch(e) {} return passed;
}
ยง"defineProperty" handler
?
function(){
var proxied = {}; var passed = false; Object.defineProperty( new Proxy(proxied, { defineProperty: function (t, k, d) { passed = t === proxied && k === "foo" && d.value === 5; return true; } }), "foo", { value: 5, configurable: true } ); return passed;
}
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Error
Error
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Error
Error
Error
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Error
function(){
var proxied = {}; var passed = false; Object.defineProperty( new Proxy(proxied, { defineProperty: function (t, k, d) { passed = t === proxied && k === "foo" && d.value === 5; return true; } }), "foo", { value: 5, configurable: true } ); return passed;
}
ยง"defineProperty" handler invariants
?
function(){
var passed = false; new Proxy({},{}); // A property cannot be added, if the target object is not extensible. var proxied = Object.preventExtensions({}); var proxy = new Proxy(proxied, { defineProperty: function() { passed = true; return true; } }); try { Object.defineProperty(proxy, "foo", { value: 2 }); return false; } catch(e) {} // A property cannot be non-configurable, unless there exists a corresponding // non-configurable own property of the target object. try { Object.defineProperty( new Proxy({ bar: true }, { defineProperty: function () { return true; } }), "bar", { value: 5, configurable: false, writable: true, enumerable: true } ); return false; } catch(e) {} return passed;
}
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Error
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Error
function(){
var passed = false; new Proxy({},{}); // A property cannot be added, if the target object is not extensible. var proxied = Object.preventExtensions({}); var proxy = new Proxy(proxied, { defineProperty: function() { passed = true; return true; } }); try { Object.defineProperty(proxy, "foo", { value: 2 }); return false; } catch(e) {} // A property cannot be non-configurable, unless there exists a corresponding // non-configurable own property of the target object. try { Object.defineProperty( new Proxy({ bar: true }, { defineProperty: function () { return true; } }), "bar", { value: 5, configurable: false, writable: true, enumerable: true } ); return false; } catch(e) {} return passed;
}
ยง"getPrototypeOf" handler
?
function(){
var proxied = {}; var fakeProto = {}; var proxy = new Proxy(proxied, { getPrototypeOf: function (t) { return t === proxied && fakeProto; } }); return Object.getPrototypeOf(proxy) === fakeProto;
}
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = {}; var fakeProto = {}; var proxy = new Proxy(proxied, { getPrototypeOf: function (t) { return t === proxied && fakeProto; } }); return Object.getPrototypeOf(proxy) === fakeProto;
}
ยง"getPrototypeOf" handler invariant
?
function(){
var passed = false; new Proxy({},{}); // If the target object is not extensible, [[GetPrototypeOf]] applied to the proxy object // must return the same value as [[GetPrototypeOf]] applied to the proxy object's target object. try { Object.getPrototypeOf(new Proxy(Object.preventExtensions({}), { getPrototypeOf: function () { passed = true; return {}; } })); return false; } catch(e) {} return passed;
}
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Error
Error
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Error
function(){
var passed = false; new Proxy({},{}); // If the target object is not extensible, [[GetPrototypeOf]] applied to the proxy object // must return the same value as [[GetPrototypeOf]] applied to the proxy object's target object. try { Object.getPrototypeOf(new Proxy(Object.preventExtensions({}), { getPrototypeOf: function () { passed = true; return {}; } })); return false; } catch(e) {} return passed;
}
ยง"setPrototypeOf" handler
?
function(){
var proxied = {}; var newProto = {}; var passed = false; Object.setPrototypeOf( new Proxy(proxied, { setPrototypeOf: function (t, p) { passed = t === proxied && p === newProto; return true; } }), newProto ); return passed;
}
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Error
Error
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Error
Error
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Error
Error
function(){
var proxied = {}; var newProto = {}; var passed = false; Object.setPrototypeOf( new Proxy(proxied, { setPrototypeOf: function (t, p) { passed = t === proxied && p === newProto; return true; } }), newProto ); return passed;
}
ยง"setPrototypeOf" handler invariant
?
function(){
var passed = false; new Proxy({},{}); Object.setPrototypeOf({},{}); // If the target object is not extensible, the argument value must be the // same as the result of [[GetPrototypeOf]] applied to target object. try { Object.setPrototypeOf( new Proxy(Object.preventExtensions({}), { setPrototypeOf: function () { passed = true; return true; } }),{}); return false; } catch(e) {} return passed;
}
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new Proxy({},{}); Object.setPrototypeOf({},{}); // If the target object is not extensible, the argument value must be the // same as the result of [[GetPrototypeOf]] applied to target object. try { Object.setPrototypeOf( new Proxy(Object.preventExtensions({}), { setPrototypeOf: function () { passed = true; return true; } }),{}); return false; } catch(e) {} return passed;
}
ยง"isExtensible" handler
?
function(){
var proxied = {}; var passed = false; Object.isExtensible( new Proxy(proxied, { isExtensible: function (t) { passed = t === proxied; return true; } }) ); return passed;
}
Yes
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Error
Error
Error
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Error
Error
Error
function(){
var proxied = {}; var passed = false; Object.isExtensible( new Proxy(proxied, { isExtensible: function (t) { passed = t === proxied; return true; } }) ); return passed;
}
ยง"isExtensible" handler invariant
?
function(){
var passed = false; new Proxy({},{}); // [[IsExtensible]] applied to the proxy object must return the same value // as [[IsExtensible]] applied to the proxy object's target object with the same argument. try { Object.isExtensible(new Proxy({}, { isExtensible: function (t) { passed = true; return false; } })); return false; } catch(e) {} try { Object.isExtensible(new Proxy(Object.preventExtensions({}), { isExtensible: function (t) { return true; } })); return false; } catch(e) {} return true;
}
Yes
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Error
Error
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Error
function(){
var passed = false; new Proxy({},{}); // [[IsExtensible]] applied to the proxy object must return the same value // as [[IsExtensible]] applied to the proxy object's target object with the same argument. try { Object.isExtensible(new Proxy({}, { isExtensible: function (t) { passed = true; return false; } })); return false; } catch(e) {} try { Object.isExtensible(new Proxy(Object.preventExtensions({}), { isExtensible: function (t) { return true; } })); return false; } catch(e) {} return true;
}
ยง"preventExtensions" handler
?
function(){
var proxied = {}; var passed = false; Object.preventExtensions( new Proxy(proxied, { preventExtensions: function (t) { passed = t === proxied; return Object.preventExtensions(proxied); } }) ); return passed;
}
Yes
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = {}; var passed = false; Object.preventExtensions( new Proxy(proxied, { preventExtensions: function (t) { passed = t === proxied; return Object.preventExtensions(proxied); } }) ); return passed;
}
ยง"preventExtensions" handler invariant
?
function(){
var passed = false; new Proxy({},{}); // [[PreventExtensions]] applied to the proxy object only returns true // if [[IsExtensible]] applied to the proxy object's target object is false. try { Object.preventExtensions(new Proxy({}, { preventExtensions: function () { passed = true; return true; } })); return false; } catch(e) {} return passed;
}
Yes
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
var passed = false; new Proxy({},{}); // [[PreventExtensions]] applied to the proxy object only returns true // if [[IsExtensible]] applied to the proxy object's target object is false. try { Object.preventExtensions(new Proxy({}, { preventExtensions: function () { passed = true; return true; } })); return false; } catch(e) {} return passed;
}
ยง"ownKeys" handler
?
function(){
var proxied = {}; var passed = false; Object.keys( new Proxy(proxied, { ownKeys: function (t) { passed = t === proxied; return []; } }) ); return passed;
}
Yes
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
var proxied = {}; var passed = false; Object.keys( new Proxy(proxied, { ownKeys: function (t) { passed = t === proxied; return []; } }) ); return passed;
}
ยง"ownKeys" handler invariant
?
function(){
var passed = false; new Proxy({},{}); // The Type of each result List element is either String or Symbol. try { Object.keys(new Proxy({}, { ownKeys: function () { passed = true; return [2]; }})); return false; } catch(e) {} // The result List must contain the keys of all non-configurable own properties of the target object. var proxied = {}; Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { Object.keys(new Proxy(proxied, { ownKeys: function () { return []; }})); return false; } catch(e) {} // If the target object is not extensible, then the result List must contain all the keys // of the own properties of the target object and no other values. try { Object.keys(new Proxy(Object.preventExtensions({b:1}), { ownKeys: function () { return ['a']; }})); return false; } catch(e) {} return passed;
}
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function(){
var passed = false; new Proxy({},{}); // The Type of each result List element is either String or Symbol. try { Object.keys(new Proxy({}, { ownKeys: function () { passed = true; return [2]; }})); return false; } catch(e) {} // The result List must contain the keys of all non-configurable own properties of the target object. var proxied = {}; Object.defineProperty(proxied, "foo", { value: 2, writable: true, enumerable: true }); try { Object.keys(new Proxy(proxied, { ownKeys: function () { return []; }})); return false; } catch(e) {} // If the target object is not extensible, then the result List must contain all the keys // of the own properties of the target object and no other values. try { Object.keys(new Proxy(Object.preventExtensions({b:1}), { ownKeys: function () { return ['a']; }})); return false; } catch(e) {} return passed;
}
ยง"apply" handler
?
function(){
var proxied = function(){}; var passed = false; var host = { method: new Proxy(proxied, { apply: function (t, thisArg, args) { passed = t === proxied && thisArg === host && args + "" === "foo,bar"; } }) }; host.method("foo", "bar"); return passed;
}
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function(){
var proxied = function(){}; var passed = false; var host = { method: new Proxy(proxied, { apply: function (t, thisArg, args) { passed = t === proxied && thisArg === host && args + "" === "foo,bar"; } }) }; host.method("foo", "bar"); return passed;
}
ยง"apply" handler invariant
?
function(){
var passed = false; new Proxy(function(){}, { apply: function () { passed = true; } })(); // A Proxy exotic object only has a [[Call]] internal method if the // initial value of its [[ProxyTarget]] internal slot is an object // that has a [[Call]] internal method. try { new Proxy({}, { apply: function () {} })(); return false; } catch(e) {} return passed;
}
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function(){
var passed = false; new Proxy(function(){}, { apply: function () { passed = true; } })(); // A Proxy exotic object only has a [[Call]] internal method if the // initial value of its [[ProxyTarget]] internal slot is an object // that has a [[Call]] internal method. try { new Proxy({}, { apply: function () {} })(); return false; } catch(e) {} return passed;
}
ยง"construct" handler
?
function(){
var proxied = function(){}; var passed = false; new new Proxy(proxied, { construct: function (t, args) { passed = t === proxied && args + "" === "foo,bar"; return {}; } })("foo","bar"); return passed;
}
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function(){
var proxied = function(){}; var passed = false; new new Proxy(proxied, { construct: function (t, args) { passed = t === proxied && args + "" === "foo,bar"; return {}; } })("foo","bar"); return passed;
}
ยง"construct" handler invariants
?
function(){
var passed = false; new Proxy({},{}); // A Proxy exotic object only has a [[Construct]] internal method if the // initial value of its [[ProxyTarget]] internal slot is an object // that has a [[Construct]] internal method. try { new new Proxy({}, { construct: function (t, args) { return {}; } })(); return false; } catch(e) {} // The result of [[Construct]] must be an Object. try { new new Proxy(function(){}, { construct: function (t, args) { passed = true; return 5; } })(); return false; } catch(e) {} return passed;
}
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function(){
var passed = false; new Proxy({},{}); // A Proxy exotic object only has a [[Construct]] internal method if the // initial value of its [[ProxyTarget]] internal slot is an object // that has a [[Construct]] internal method. try { new new Proxy({}, { construct: function (t, args) { return {}; } })(); return false; } catch(e) {} // The result of [[Construct]] must be an Object. try { new new Proxy(function(){}, { construct: function (t, args) { passed = true; return 5; } })(); return false; } catch(e) {} return passed;
}
ยงProxy.revocable
?
function(){
var obj = Proxy.revocable({}, { get: function() { return 5; } }); var passed = (obj.proxy.foo === 5); obj.revoke(); try { obj.proxy.foo; } catch(e) { passed &= e instanceof TypeError; } return passed;
}
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function(){
var obj = Proxy.revocable({}, { get: function() { return 5; } }); var passed = (obj.proxy.foo === 5); obj.revoke(); try { obj.proxy.foo; } catch(e) { passed &= e instanceof TypeError; } return passed;
}
ยงArray.isArray support
?
function(){
return Array.isArray(new Proxy([], {}));
}
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function(){
return Array.isArray(new Proxy([], {}));
}
ยงJSON.stringify support
?
function(){
return JSON.stringify(new Proxy(['foo'], {})) === '["foo"]';
}
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function(){
return JSON.stringify(new Proxy(['foo'], {})) === '["foo"]';
}

Reflect

ยงReflect.get
?
function(){
return Reflect.get({ qux: 987 }, "qux") === 987;
}
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function(){
return Reflect.get({ qux: 987 }, "qux") === 987;
}
ยงReflect.set
?
function(){
var obj = {}; Reflect.set(obj, "quux", 654); return obj.quux === 654;
}
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function(){
var obj = {}; Reflect.set(obj, "quux", 654); return obj.quux === 654;
}
ยงReflect.has
?
function(){
return Reflect.has({ qux: 987 }, "qux");
}
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Error
function(){
return Reflect.has({ qux: 987 }, "qux");
}
ยงReflect.deleteProperty
?
function(){
var obj = { bar: 456 }; Reflect.deleteProperty(obj, "bar"); return !("bar" in obj);
}
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function(){
var obj = { bar: 456 }; Reflect.deleteProperty(obj, "bar"); return !("bar" in obj);
}
ยงReflect.getOwnPropertyDescriptor
?
function(){
var obj = { baz: 789 }; var desc = Reflect.getOwnPropertyDescriptor(obj, "baz"); return desc.value === 789 && desc.configurable && desc.writable && desc.enumerable;
}
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function(){
var obj = { baz: 789 }; var desc = Reflect.getOwnPropertyDescriptor(obj, "baz"); return desc.value === 789 && desc.configurable && desc.writable && desc.enumerable;
}
ยงReflect.defineProperty
?
function(){
var obj = {}; Reflect.defineProperty(obj, "foo", { value: 123 }); return obj.foo === 123 && Reflect.defineProperty(Object.freeze({}), "foo", { value: 123 }) === false;
}
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function(){
var obj = {}; Reflect.defineProperty(obj, "foo", { value: 123 }); return obj.foo === 123 && Reflect.defineProperty(Object.freeze({}), "foo", { value: 123 }) === false;
}
ยงReflect.getPrototypeOf
?
function(){
return Reflect.getPrototypeOf([]) === Array.prototype;
}
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function(){
return Reflect.getPrototypeOf([]) === Array.prototype;
}
ยงReflect.setPrototypeOf
?
function(){
var obj = {}; Reflect.setPrototypeOf(obj, Array.prototype); return obj instanceof Array;
}
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function(){
var obj = {}; Reflect.setPrototypeOf(obj, Array.prototype); return obj instanceof Array;
}
ยงReflect.isExtensible
?
function(){
return Reflect.isExtensible({}) && !Reflect.isExtensible(Object.preventExtensions({}));
}
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Error
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function(){
return Reflect.isExtensible({}) && !Reflect.isExtensible(Object.preventExtensions({}));
}
ยงReflect.preventExtensions
?
function(){
var obj = {}; Reflect.preventExtensions(obj); return !Object.isExtensible(obj);
}
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
var obj = {}; Reflect.preventExtensions(obj); return !Object.isExtensible(obj);
}
ยงReflect.ownKeys, string keys
?
function(){
var obj = Object.create({ C: true }); obj.A = true; Object.defineProperty(obj, 'B', { value: true, enumerable: false }); return Reflect.ownKeys(obj).sort() + '' === "A,B";
}
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Error
Error
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Error
function(){
var obj = Object.create({ C: true }); obj.A = true; Object.defineProperty(obj, 'B', { value: true, enumerable: false }); return Reflect.ownKeys(obj).sort() + '' === "A,B";
}
ยงReflect.ownKeys, symbol keys
?
function(){
var s1 = Symbol(), s2 = Symbol(), s3 = Symbol(); var proto = {}; proto[s1] = true; var obj = Object.create(proto); obj[s2] = true; Object.defineProperty(obj, s3, { value: true, enumerable: false }); var keys = Reflect.ownKeys(obj); return keys.indexOf(s2) >-1 && keys.indexOf(s3) >-1 && keys.length === 2;
}
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Error
Error
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Error
function(){
var s1 = Symbol(), s2 = Symbol(), s3 = Symbol(); var proto = {}; proto[s1] = true; var obj = Object.create(proto); obj[s2] = true; Object.defineProperty(obj, s3, { value: true, enumerable: false }); var keys = Reflect.ownKeys(obj); return keys.indexOf(s2) >-1 && keys.indexOf(s3) >-1 && keys.length === 2;
}
ยงReflect.apply
?
function(){
return Reflect.apply(Array.prototype.push, [1,2], [3,4,5]) === 5;
}
Yes
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
return Reflect.apply(Array.prototype.push, [1,2], [3,4,5]) === 5;
}
ยงReflect.construct
?
function(){
return Reflect.construct(function(a, b, c) { this.qux = a + b + c; }, ["foo", "bar", "baz"]).qux === "foobarbaz";
}
Yes
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Error
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Error
function(){
return Reflect.construct(function(a, b, c) { this.qux = a + b + c; }, ["foo", "bar", "baz"]).qux === "foobarbaz";
}
ยงReflect.construct sets new.target meta-property
?
function(){
return Reflect.construct(function(a, b, c) { if (new.target === Object) { this.qux = a + b + c; } }, ["foo", "bar", "baz"], Object).qux === "foobarbaz";
}
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Error
Error
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Error
Error
function(){
return Reflect.construct(function(a, b, c) { if (new.target === Object) { this.qux = a + b + c; } }, ["foo", "bar", "baz"], Object).qux === "foobarbaz";
}
ยงReflect.construct creates instances from third argument
?
function(){
function F(){} var obj = Reflect.construct(function(){ this.y = 1; }, [], F); return obj.y === 1 && obj instanceof F;
}
Yes
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Error
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Error
function(){
function F(){} var obj = Reflect.construct(function(){ this.y = 1; }, [], F); return obj.y === 1 && obj instanceof F;
}
ยงReflect.construct, Array subclassing
?
function(){
function F(){} var obj = Reflect.construct(Array, [], F); obj[2] = 'foo'; return obj.length === 3 && obj instanceof F;
}
Yes
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Error
Error
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Error
function(){
function F(){} var obj = Reflect.construct(Array, [], F); obj[2] = 'foo'; return obj.length === 3 && obj instanceof F;
}
ยงReflect.construct, RegExp subclassing
?
function(){
function F(){} var obj = Reflect.construct(RegExp, ["baz","g"], F); return RegExp.prototype.exec.call(obj, "foobarbaz")[0] === "baz" && obj.lastIndex === 9 && obj instanceof F;
}
Yes
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Error
Error
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Error
function(){
function F(){} var obj = Reflect.construct(RegExp, ["baz","g"], F); return RegExp.prototype.exec.call(obj, "foobarbaz")[0] === "baz" && obj.lastIndex === 9 && obj instanceof F;
}
ยงReflect.construct, Function subclassing
?
function(){
function F(){} var obj = Reflect.construct(Function, ["return 2"], F); return obj() === 2 && obj instanceof F;
}
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Error
Error
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Error
function(){
function F(){} var obj = Reflect.construct(Function, ["return 2"], F); return obj() === 2 && obj instanceof F;
}
ยงReflect.construct, Promise subclassing
?
function(){
function F(){} var p1 = Reflect.construct(Promise,[function(resolve, reject) { resolve("foo"); }], F); var p2 = Reflect.construct(Promise,[function(resolve, reject) { reject("quux"); }], F); var score = +(p1 instanceof F && p2 instanceof F); function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "quux"); check(); } function shouldNotRun(result) { score = -Infinity; } p1.then = p2.then = Promise.prototype.then; p1.catch = p2.catch = Promise.prototype.catch; p1.then(thenFn, shouldNotRun); p2.then(shouldNotRun, catchFn); p1.catch(shouldNotRun); p2.catch(catchFn); function check() { if (score === 4) asyncTestPassed(); }
}
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Error
Error
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Error
Error
function(){
function F(){} var p1 = Reflect.construct(Promise,[function(resolve, reject) { resolve("foo"); }], F); var p2 = Reflect.construct(Promise,[function(resolve, reject) { reject("quux"); }], F); var score = +(p1 instanceof F && p2 instanceof F); function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "quux"); check(); } function shouldNotRun(result) { score = -Infinity; } p1.then = p2.then = Promise.prototype.then; p1.catch = p2.catch = Promise.prototype.catch; p1.then(thenFn, shouldNotRun); p2.then(shouldNotRun, catchFn); p1.catch(shouldNotRun); p2.catch(catchFn); function check() { if (score === 4) asyncTestPassed(); }
}

Promise

ยงbasic functionality
?
function(){
var p1 = new Promise(function(resolve, reject) { resolve("foo"); }); var p2 = new Promise(function(resolve, reject) { reject("quux"); }); var score = 0; function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "quux"); check(); } function shouldNotRun(result) { score = -Infinity; } p1.then(thenFn, shouldNotRun); p2.then(shouldNotRun, catchFn); p1.catch(shouldNotRun); p2.catch(catchFn); p1.then(function() { // Promise.prototype.then() should return a new Promise score += p1.then() !== p1; check(); }); function check() { if (score === 4) asyncTestPassed(); }
}
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Error
Error
function(){
var p1 = new Promise(function(resolve, reject) { resolve("foo"); }); var p2 = new Promise(function(resolve, reject) { reject("quux"); }); var score = 0; function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "quux"); check(); } function shouldNotRun(result) { score = -Infinity; } p1.then(thenFn, shouldNotRun); p2.then(shouldNotRun, catchFn); p1.catch(shouldNotRun); p2.catch(catchFn); p1.then(function() { // Promise.prototype.then() should return a new Promise score += p1.then() !== p1; check(); }); function check() { if (score === 4) asyncTestPassed(); }
}
ยงconstructor requires new
?
function(){
new Promise(function(){}); try { Promise(function(){}); return false; } catch(e) { return true; }
}
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Error
Error
function(){
new Promise(function(){}); try { Promise(function(){}); return false; } catch(e) { return true; }
}
ยงPromise.prototype isn't an instance
?
function(){
new Promise(function(){}); try { Promise.prototype.then(function(){}); } catch (e) { return true; }
}
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Error
Error
function(){
new Promise(function(){}); try { Promise.prototype.then(function(){}); } catch (e) { return true; }
}
ยงPromise.all
?
function(){
var fulfills = Promise.all([ new Promise(function(resolve) { setTimeout(resolve,2000,"foo"); }), new Promise(function(resolve) { setTimeout(resolve,1000,"bar"); }) ]); var rejects = Promise.all([ new Promise(function(_, reject) { setTimeout(reject, 2000,"baz"); }), new Promise(function(_, reject) { setTimeout(reject, 1000,"qux"); }) ]); var score = 0; fulfills.then(function(result) { score += (result + "" === "foo,bar"); check(); }); rejects.catch(function(result) { score += (result === "qux"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
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Error
Error
function(){
var fulfills = Promise.all([ new Promise(function(resolve) { setTimeout(resolve,2000,"foo"); }), new Promise(function(resolve) { setTimeout(resolve,1000,"bar"); }) ]); var rejects = Promise.all([ new Promise(function(_, reject) { setTimeout(reject, 2000,"baz"); }), new Promise(function(_, reject) { setTimeout(reject, 1000,"qux"); }) ]); var score = 0; fulfills.then(function(result) { score += (result + "" === "foo,bar"); check(); }); rejects.catch(function(result) { score += (result === "qux"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
ยงPromise.all, generic iterables
?
function(){
var fulfills = Promise.all(global.__createIterableObject([ new Promise(function(resolve) { setTimeout(resolve,2000,"foo"); }), new Promise(function(resolve) { setTimeout(resolve,1000,"bar"); }) ])); var rejects = Promise.all(global.__createIterableObject([ new Promise(function(_, reject) { setTimeout(reject, 2000,"baz"); }), new Promise(function(_, reject) { setTimeout(reject, 1000,"qux"); }) ])); var score = 0; fulfills.then(function(result) { score += (result + "" === "foo,bar"); check(); }); rejects.catch(function(result) { score += (result === "qux"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
Yes
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No
No
Error
Error
function(){
var fulfills = Promise.all(global.__createIterableObject([ new Promise(function(resolve) { setTimeout(resolve,2000,"foo"); }), new Promise(function(resolve) { setTimeout(resolve,1000,"bar"); }) ])); var rejects = Promise.all(global.__createIterableObject([ new Promise(function(_, reject) { setTimeout(reject, 2000,"baz"); }), new Promise(function(_, reject) { setTimeout(reject, 1000,"qux"); }) ])); var score = 0; fulfills.then(function(result) { score += (result + "" === "foo,bar"); check(); }); rejects.catch(function(result) { score += (result === "qux"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
ยงPromise.race
?
function(){
var fulfills = Promise.race([ new Promise(function(resolve) { setTimeout(resolve,1000,"foo"); }), new Promise(function(_, reject) { setTimeout(reject, 2000,"bar"); }) ]); var rejects = Promise.race([ new Promise(function(_, reject) { setTimeout(reject, 1000,"baz"); }), new Promise(function(resolve) { setTimeout(resolve,2000,"qux"); }) ]); var score = 0; fulfills.then(function(result) { score += (result === "foo"); check(); }); rejects.catch(function(result) { score += (result === "baz"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
Yes
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Yes
Yes
Yes
Error
Error
function(){
var fulfills = Promise.race([ new Promise(function(resolve) { setTimeout(resolve,1000,"foo"); }), new Promise(function(_, reject) { setTimeout(reject, 2000,"bar"); }) ]); var rejects = Promise.race([ new Promise(function(_, reject) { setTimeout(reject, 1000,"baz"); }), new Promise(function(resolve) { setTimeout(resolve,2000,"qux"); }) ]); var score = 0; fulfills.then(function(result) { score += (result === "foo"); check(); }); rejects.catch(function(result) { score += (result === "baz"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
ยงPromise.race, generic iterables
?
function(){
var fulfills = Promise.race(global.__createIterableObject([ new Promise(function(resolve) { setTimeout(resolve,1000,"foo"); }), new Promise(function(_, reject) { setTimeout(reject, 2000,"bar"); }) ])); var rejects = Promise.race(global.__createIterableObject([ new Promise(function(_, reject) { setTimeout(reject, 1000,"baz"); }), new Promise(function(resolve) { setTimeout(resolve,2000,"qux"); }) ])); var score = 0; fulfills.then(function(result) { score += (result === "foo"); check(); }); rejects.catch(function(result) { score += (result === "baz"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
Yes
Yes
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Yes
Yes
Yes
Yes
No
No
Error
Error
function(){
var fulfills = Promise.race(global.__createIterableObject([ new Promise(function(resolve) { setTimeout(resolve,1000,"foo"); }), new Promise(function(_, reject) { setTimeout(reject, 2000,"bar"); }) ])); var rejects = Promise.race(global.__createIterableObject([ new Promise(function(_, reject) { setTimeout(reject, 1000,"baz"); }), new Promise(function(resolve) { setTimeout(resolve,2000,"qux"); }) ])); var score = 0; fulfills.then(function(result) { score += (result === "foo"); check(); }); rejects.catch(function(result) { score += (result === "baz"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
ยงPromise[Symbol.species]
?
function(){
var prop = Object.getOwnPropertyDescriptor(Promise, Symbol.species); return 'get' in prop && Promise[Symbol.species] === Promise;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var prop = Object.getOwnPropertyDescriptor(Promise, Symbol.species); return 'get' in prop && Promise[Symbol.species] === Promise;
}

Symbol

ยงbasic functionality
?
function(){
var object = {}; var symbol = Symbol(); var value = {}; object[symbol] = value; return object[symbol] === value;
}
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var object = {}; var symbol = Symbol(); var value = {}; object[symbol] = value; return object[symbol] === value;
}
ยงtypeof support
?
function(){
return typeof Symbol() === "symbol";
}
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return typeof Symbol() === "symbol";
}
ยงsymbol keys are hidden to pre-ES6 code
?
function(){
var object = {}; var symbol = Symbol(); object[symbol] = 1; for (var x in object){} var passed = !x; if (Object.keys && Object.getOwnPropertyNames) { passed &= Object.keys(object).length === 0 && Object.getOwnPropertyNames(object).length === 0; } return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var object = {}; var symbol = Symbol(); object[symbol] = 1; for (var x in object){} var passed = !x; if (Object.keys && Object.getOwnPropertyNames) { passed &= Object.keys(object).length === 0 && Object.getOwnPropertyNames(object).length === 0; } return passed;
}
ยงObject.defineProperty support
?
function(){
var object = {}; var symbol = Symbol(); var value = {}; if (Object.defineProperty) { Object.defineProperty(object, symbol, { value: value }); return object[symbol] === value; } return passed;
}
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var object = {}; var symbol = Symbol(); var value = {}; if (Object.defineProperty) { Object.defineProperty(object, symbol, { value: value }); return object[symbol] === value; } return passed;
}
ยงsymbols inherit from Symbol.prototype
?
function(){
var symbol = Symbol(); var passed = symbol.foo === void undefined; Symbol.prototype.foo = 2; passed &= symbol.foo === 2; delete Symbol.prototype.foo; return passed;
}
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var symbol = Symbol(); var passed = symbol.foo === void undefined; Symbol.prototype.foo = 2; passed &= symbol.foo === 2; delete Symbol.prototype.foo; return passed;
}
ยงcannot coerce to string or number
?
function(){
var symbol = Symbol(); try { symbol + ""; return false; } catch(e) {} try { symbol + 0; return false; } catch(e) {} return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var symbol = Symbol(); try { symbol + ""; return false; } catch(e) {} try { symbol + 0; return false; } catch(e) {} return true;
}
ยงcan convert with String()
?
function(){
return String(Symbol("foo")) === "Symbol(foo)";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
return String(Symbol("foo")) === "Symbol(foo)";
}
ยงnew Symbol() throws
?
function(){
var symbol = Symbol(); try { new Symbol(); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var symbol = Symbol(); try { new Symbol(); } catch(e) { return true; }
}
ยงObject(symbol)
?
function(){
var symbol = Symbol(); var symbolObject = Object(symbol); return typeof symbolObject === "object" && symbolObject instanceof Symbol && symbolObject == symbol && // eslint-disable-line eqeqeq symbolObject !== symbol && symbolObject.valueOf() === symbol;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var symbol = Symbol(); var symbolObject = Object(symbol); return typeof symbolObject === "object" && symbolObject instanceof Symbol && symbolObject == symbol && // eslint-disable-line eqeqeq symbolObject !== symbol && symbolObject.valueOf() === symbol;
}
ยงJSON.stringify ignores symbol primitives
?
function(){
var object = { foo: Symbol() }; object[Symbol()] = 1; var array = [Symbol()]; return JSON.stringify(object) === '{}' && JSON.stringify(array) === '[null]' && JSON.stringify(Symbol()) === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var object = { foo: Symbol() }; object[Symbol()] = 1; var array = [Symbol()]; return JSON.stringify(object) === '{}' && JSON.stringify(array) === '[null]' && JSON.stringify(Symbol()) === void undefined;
}
ยงJSON.stringify ignores symbol objects
?
function(){
var testSymbolObject = function (sym) { var object = { foo: sym }; try { // some browsers throw a TypeError when setting symbol object keys. // this isn't part of this test, so, ignore it if so. object[sym] = 1; } catch (e) {} // some browsers throw a TypeError when setting symbol object keys. var array = [sym]; return JSON.stringify(object) === '{"foo":{}}' && JSON.stringify(array) === '[{}]' && JSON.stringify(sym) === '{}'; }; var objSym = Object(Symbol()); var symNoToJSON = Object(Symbol()); Object.defineProperty(symNoToJSON, 'toJSON', { enumerable: false, value: null }); // ensure it overrides the prototype, but is not callable return testSymbolObject(objSym) && testSymbolObject(symNoToJSON);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var testSymbolObject = function (sym) { var object = { foo: sym }; try { // some browsers throw a TypeError when setting symbol object keys. // this isn't part of this test, so, ignore it if so. object[sym] = 1; } catch (e) {} // some browsers throw a TypeError when setting symbol object keys. var array = [sym]; return JSON.stringify(object) === '{"foo":{}}' && JSON.stringify(array) === '[{}]' && JSON.stringify(sym) === '{}'; }; var objSym = Object(Symbol()); var symNoToJSON = Object(Symbol()); Object.defineProperty(symNoToJSON, 'toJSON', { enumerable: false, value: null }); // ensure it overrides the prototype, but is not callable return testSymbolObject(objSym) && testSymbolObject(symNoToJSON);
}
ยงglobal symbol registry
?
function(){
var symbol = Symbol.for('foo'); return Symbol.for('foo') === symbol && Symbol.keyFor(symbol) === 'foo';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var symbol = Symbol.for('foo'); return Symbol.for('foo') === symbol && Symbol.keyFor(symbol) === 'foo';
}

well-known symbols

ยงSymbol.hasInstance
?
function(){
var passed = false; var obj = { foo: true }; var C = function(){}; Object.defineProperty(C, Symbol.hasInstance, { value: function(inst) { passed = inst.foo; return false; } }); obj instanceof C; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
var passed = false; var obj = { foo: true }; var C = function(){}; Object.defineProperty(C, Symbol.hasInstance, { value: function(inst) { passed = inst.foo; return false; } }); obj instanceof C; return passed;
}
ยงSymbol.isConcatSpreadable, non-spreadable array
?
function(){
var a = [], b = []; b[Symbol.isConcatSpreadable] = false; a = a.concat(b); return a[0] === b;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var a = [], b = []; b[Symbol.isConcatSpreadable] = false; a = a.concat(b); return a[0] === b;
}
ยงSymbol.isConcatSpreadable, spreadable object with poisoned getter
?
function(){
if (typeof Symbol !== 'function' || !Symbol.isConcatSpreadable) { return null; } var spreadableHasPoisonedIndex = { length: Math.pow(2, 53) - 1 }; spreadableHasPoisonedIndex[Symbol.isConcatSpreadable] = true; Object.defineProperty(spreadableHasPoisonedIndex, 0, { get: function () { throw new SyntaxError(); } }); try { [].concat(spreadableHasPoisonedIndex); return false; } catch (e) { return !!e && e.name === 'SyntaxError'; }
}
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
if (typeof Symbol !== 'function' || !Symbol.isConcatSpreadable) { return null; } var spreadableHasPoisonedIndex = { length: Math.pow(2, 53) - 1 }; spreadableHasPoisonedIndex[Symbol.isConcatSpreadable] = true; Object.defineProperty(spreadableHasPoisonedIndex, 0, { get: function () { throw new SyntaxError(); } }); try { [].concat(spreadableHasPoisonedIndex); return false; } catch (e) { return !!e && e.name === 'SyntaxError'; }
}
ยงSymbol.iterator, existence
?
function(){
return "iterator" in Symbol;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return "iterator" in Symbol;
}
ยงSymbol.iterator, arguments object
?
function(){
return (function() { return typeof arguments[Symbol.iterator] === 'function' && Object.hasOwnProperty.call(arguments, Symbol.iterator); }());
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
function(){
return (function() { return typeof arguments[Symbol.iterator] === 'function' && Object.hasOwnProperty.call(arguments, Symbol.iterator); }());
}
ยงSymbol.species, existence
?
function(){
return "species" in Symbol;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
return "species" in Symbol;
}
ยงSymbol.species, Array.prototype.concat
?
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.concat.call(obj, []).foo === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.concat.call(obj, []).foo === 1;
}
ยงSymbol.species, Array.prototype.filter
?
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.filter.call(obj, Boolean).foo === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.filter.call(obj, Boolean).foo === 1;
}
ยงSymbol.species, Array.prototype.map
?
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.map.call(obj, Boolean).foo === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.map.call(obj, Boolean).foo === 1;
}
ยงSymbol.species, Array.prototype.slice
?
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.slice.call(obj, 0).foo === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.slice.call(obj, 0).foo === 1;
}
ยงSymbol.species, Array.prototype.splice
?
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.splice.call(obj, 0).foo === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
var obj = []; obj.constructor = {}; obj.constructor[Symbol.species] = function() { return { foo: 1 }; }; return Array.prototype.splice.call(obj, 0).foo === 1;
}
ยงSymbol.species, RegExp.prototype[Symbol.split]
?
function(){
var passed = false; var obj = { constructor: {} }; obj[Symbol.split] = RegExp.prototype[Symbol.split]; obj.constructor[Symbol.species] = function() { passed = true; return /./; }; "".split(obj); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
No
No
No
No
No
No
Error
Error
function(){
var passed = false; var obj = { constructor: {} }; obj[Symbol.split] = RegExp.prototype[Symbol.split]; obj.constructor[Symbol.species] = function() { passed = true; return /./; }; "".split(obj); return passed;
}
ยงSymbol.species, Promise.prototype.then
?
function(){
var promise = new Promise(function(resolve){ resolve(42); }); var FakePromise1 = promise.constructor = function(exec){ exec(function(){}, function(){}); }; var FakePromise2 = function(exec){ exec(function(){}, function(){}); }; Object.defineProperty(FakePromise1, Symbol.species, {value: FakePromise2}); return promise.then(function(){}) instanceof FakePromise2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
Error
Error
function(){
var promise = new Promise(function(resolve){ resolve(42); }); var FakePromise1 = promise.constructor = function(exec){ exec(function(){}, function(){}); }; var FakePromise2 = function(exec){ exec(function(){}, function(){}); }; Object.defineProperty(FakePromise1, Symbol.species, {value: FakePromise2}); return promise.then(function(){}) instanceof FakePromise2;
}
ยงSymbol.replace
?
function(){
var O = {}; O[Symbol.replace] = function(){ return 42; }; return ''.replace(O) === 42;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var O = {}; O[Symbol.replace] = function(){ return 42; }; return ''.replace(O) === 42;
}
ยงSymbol.search
?
function(){
var O = {}; O[Symbol.search] = function(){ return 42; }; return ''.search(O) === 42;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var O = {}; O[Symbol.search] = function(){ return 42; }; return ''.search(O) === 42;
}
ยงSymbol.split
?
function(){
var O = {}; O[Symbol.split] = function(){ return 42; }; return ''.split(O) === 42;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var O = {}; O[Symbol.split] = function(){ return 42; }; return ''.split(O) === 42;
}
ยงSymbol.match
?
function(){
var O = {}; O[Symbol.match] = function(){ return 42; }; return ''.match(O) === 42;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var O = {}; O[Symbol.match] = function(){ return 42; }; return ''.match(O) === 42;
}
ยงSymbol.match, RegExp constructor
?
function(){
var re = /./; re[Symbol.match] = false; var foo = {constructor: RegExp}; foo[Symbol.match] = true; return RegExp(re) !== re && RegExp(foo) === foo;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var re = /./; re[Symbol.match] = false; var foo = {constructor: RegExp}; foo[Symbol.match] = true; return RegExp(re) !== re && RegExp(foo) === foo;
}
ยงSymbol.match, String.prototype.startsWith
?
function(){
var re = /./; try { '/./'.startsWith(re); } catch(e){ re[Symbol.match] = false; return '/./'.startsWith(re); }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var re = /./; try { '/./'.startsWith(re); } catch(e){ re[Symbol.match] = false; return '/./'.startsWith(re); }
}
ยงSymbol.match, String.prototype.endsWith
?
function(){
var re = /./; try { '/./'.endsWith(re); } catch(e){ re[Symbol.match] = false; return '/./'.endsWith(re); }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var re = /./; try { '/./'.endsWith(re); } catch(e){ re[Symbol.match] = false; return '/./'.endsWith(re); }
}
ยงSymbol.match, String.prototype.includes
?
function(){
var re = /./; try { '/./'.includes(re); } catch(e){ re[Symbol.match] = false; return '/./'.includes(re); }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var re = /./; try { '/./'.includes(re); } catch(e){ re[Symbol.match] = false; return '/./'.includes(re); }
}
ยงSymbol.toPrimitive
?
function(){
var a = {}, b = {}, c = {}; var passed = 0; a[Symbol.toPrimitive] = function(hint) { passed += hint === "number"; return 0; }; b[Symbol.toPrimitive] = function(hint) { passed += hint === "string"; return 0; }; c[Symbol.toPrimitive] = function(hint) { passed += hint === "default"; return 0; }; a >= 0; b in {}; c == 0; // eslint-disable-line eqeqeq return passed === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
var a = {}, b = {}, c = {}; var passed = 0; a[Symbol.toPrimitive] = function(hint) { passed += hint === "number"; return 0; }; b[Symbol.toPrimitive] = function(hint) { passed += hint === "string"; return 0; }; c[Symbol.toPrimitive] = function(hint) { passed += hint === "default"; return 0; }; a >= 0; b in {}; c == 0; // eslint-disable-line eqeqeq return passed === 3;
}
ยงSymbol.toStringTag
?
function(){
var a = {}; a[Symbol.toStringTag] = "foo"; return (a + "") === "[object foo]";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
Flag
No
No
Error
Error
function(){
var a = {}; a[Symbol.toStringTag] = "foo"; return (a + "") === "[object foo]";
}
ยงSymbol.toStringTag affects existing built-ins
?
function(){
var s = Symbol.toStringTag; var passed = true; [ [Array.prototype, []], [String.prototype, ''], [arguments, arguments], [Function.prototype, function(){}], [Error.prototype, new Error()], [Boolean.prototype, true], [Number.prototype, 2], [Date.prototype, new Date()], [RegExp.prototype, /./] ].forEach(function(pair){ pair[0][s] = "foo"; passed &= (Object.prototype.toString.call(pair[1]) === "[object foo]"); delete pair[0][s]; }); return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
Yes
No
Flag
No
Flag
No
No
Error
Error
function(){
var s = Symbol.toStringTag; var passed = true; [ [Array.prototype, []], [String.prototype, ''], [arguments, arguments], [Function.prototype, function(){}], [Error.prototype, new Error()], [Boolean.prototype, true], [Number.prototype, 2], [Date.prototype, new Date()], [RegExp.prototype, /./] ].forEach(function(pair){ pair[0][s] = "foo"; passed &= (Object.prototype.toString.call(pair[1]) === "[object foo]"); delete pair[0][s]; }); return passed;
}
ยงSymbol.toStringTag, new built-ins
?
function(){
var passed = true; var s = Symbol.toStringTag; [ [String, "String Iterator"], [Array, "Array Iterator"], [Map, "Map Iterator"], [Set, "Set Iterator"] ].forEach(function(pair){ var iterProto = Object.getPrototypeOf(new pair[0]()[Symbol.iterator]()); passed = passed && iterProto.hasOwnProperty(s) && iterProto[s] === pair[1]; }); passed = passed && Object.getPrototypeOf(function*(){})[s] === "GeneratorFunction" && Object.getPrototypeOf(function*(){}())[s] === "Generator" && Map.prototype[s] === "Map" && Set.prototype[s] === "Set" && ArrayBuffer.prototype[s] === "ArrayBuffer" && DataView.prototype[s] === "DataView" && Promise.prototype[s] === "Promise" && Symbol.prototype[s] === "Symbol" && typeof Object.getOwnPropertyDescriptor( Object.getPrototypeOf(Int8Array).prototype, Symbol.toStringTag).get === "function"; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Error
No
Error
Error
No
Error
Error
function(){
var passed = true; var s = Symbol.toStringTag; [ [String, "String Iterator"], [Array, "Array Iterator"], [Map, "Map Iterator"], [Set, "Set Iterator"] ].forEach(function(pair){ var iterProto = Object.getPrototypeOf(new pair[0]()[Symbol.iterator]()); passed = passed && iterProto.hasOwnProperty(s) && iterProto[s] === pair[1]; }); passed = passed && Object.getPrototypeOf(function*(){})[s] === "GeneratorFunction" && Object.getPrototypeOf(function*(){}())[s] === "Generator" && Map.prototype[s] === "Map" && Set.prototype[s] === "Set" && ArrayBuffer.prototype[s] === "ArrayBuffer" && DataView.prototype[s] === "DataView" && Promise.prototype[s] === "Promise" && Symbol.prototype[s] === "Symbol" && typeof Object.getOwnPropertyDescriptor( Object.getPrototypeOf(Int8Array).prototype, Symbol.toStringTag).get === "function"; return passed;
}
ยงSymbol.toStringTag, misc. built-ins
?
function(){
var s = Symbol.toStringTag; return Math[s] === "Math" && JSON[s] === "JSON";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
Flag
No
No
Error
Error
function(){
var s = Symbol.toStringTag; return Math[s] === "Math" && JSON[s] === "JSON";
}
ยงSymbol.unscopables
?
function(){
var a = { foo: 1, bar: 2 }; a[Symbol.unscopables] = { bar: true }; with (a) { return foo === 1 && typeof bar === "undefined"; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var a = { foo: 1, bar: 2 }; a[Symbol.unscopables] = { bar: true }; with (a) { return foo === 1 && typeof bar === "undefined"; }
}

built-in extensions

Object static methods

ยงObject.assign
?
function(){
var o = Object.assign({a:true}, {b:true}, {c:true}); return "a" in o && "b" in o && "c" in o;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var o = Object.assign({a:true}, {b:true}, {c:true}); return "a" in o && "b" in o && "c" in o;
}
ยงObject.is
?
function(){
return typeof Object.is === 'function' && Object.is(NaN, NaN) && !Object.is(-0, 0);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return typeof Object.is === 'function' && Object.is(NaN, NaN) && !Object.is(-0, 0);
}
ยงObject.getOwnPropertySymbols
?
function(){
var o = {}; var sym = Symbol(), sym2 = Symbol(), sym3 = Symbol(); o[sym] = true; o[sym2] = true; o[sym3] = true; var result = Object.getOwnPropertySymbols(o); return result[0] === sym && result[1] === sym2 && result[2] === sym3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var o = {}; var sym = Symbol(), sym2 = Symbol(), sym3 = Symbol(); o[sym] = true; o[sym2] = true; o[sym3] = true; var result = Object.getOwnPropertySymbols(o); return result[0] === sym && result[1] === sym2 && result[2] === sym3;
}
ยงObject.setPrototypeOf
?
function(){
return Object.setPrototypeOf({}, Array.prototype) instanceof Array;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return Object.setPrototypeOf({}, Array.prototype) instanceof Array;
}

function "name" property

ยงfunction statements
?
function(){
function foo(){}; return foo.name === 'foo' && (function(){}).name === '';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
function foo(){}; return foo.name === 'foo' && (function(){}).name === '';
}
ยงfunction expressions
?
function(){
return (function foo(){}).name === 'foo' && (function(){}).name === '';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return (function foo(){}).name === 'foo' && (function(){}).name === '';
}
ยงnew Function
?
function(){
return (new Function).name === "anonymous";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
return (new Function).name === "anonymous";
}
ยงbound functions
?
function(){
function foo() {}; return foo.bind({}).name === "bound foo" && (function(){}).bind({}).name === "bound ";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
function foo() {}; return foo.bind({}).name === "bound foo" && (function(){}).bind({}).name === "bound ";
}
ยงvariables (function)
?
function(){
var foo = function() {}; var bar = function baz() {}; return foo.name === "foo" && bar.name === "baz";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
No
No
function(){
var foo = function() {}; var bar = function baz() {}; return foo.name === "foo" && bar.name === "baz";
}
ยงobject methods (function)
?
function(){
var o = { foo: function(){}, bar: function baz(){}}; o.qux = function(){}; return o.foo.name === "foo" && o.bar.name === "baz" && o.qux.name === "";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
No
No
function(){
var o = { foo: function(){}, bar: function baz(){}}; o.qux = function(){}; return o.foo.name === "foo" && o.bar.name === "baz" && o.qux.name === "";
}
ยงaccessor properties
?
function(){
var o = { get foo(){}, set foo(x){} }; var descriptor = Object.getOwnPropertyDescriptor(o, "foo"); return descriptor.get.name === "get foo" && descriptor.set.name === "set foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
No
No
function(){
var o = { get foo(){}, set foo(x){} }; var descriptor = Object.getOwnPropertyDescriptor(o, "foo"); return descriptor.get.name === "get foo" && descriptor.set.name === "set foo";
}
ยงshorthand methods
?
function(){
var o = { foo(){} }; return o.foo.name === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var o = { foo(){} }; return o.foo.name === "foo";
}
ยงshorthand methods (no lexical binding)
?
function(){
var f = "foo"; return ({f() { return f; }}).f() === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var f = "foo"; return ({f() { return f; }}).f() === "foo";
}
ยงsymbol-keyed methods
?
function(){
var sym1 = Symbol("foo"); var sym2 = Symbol(); var o = { [sym1]: function(){}, [sym2]: function(){} }; return o[sym1].name === "[foo]" && o[sym2].name === "";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
Error
Error
Error
Error
function(){
var sym1 = Symbol("foo"); var sym2 = Symbol(); var o = { [sym1]: function(){}, [sym2]: function(){} }; return o[sym1].name === "[foo]" && o[sym2].name === "";
}
ยงclass statements
?
function(){
class foo {}; class bar { static name() {} }; return foo.name === "foo" && typeof bar.name === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class foo {}; class bar { static name() {} }; return foo.name === "foo" && typeof bar.name === "function";
}
ยงclass expressions
?
function(){
return class foo {}.name === "foo" && typeof class bar { static name() {} }.name === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
return class foo {}.name === "foo" && typeof class bar { static name() {} }.name === "function";
}
ยงvariables (class)
?
function(){
var foo = class {}; var bar = class baz {}; var qux = class { static name() {} }; return foo.name === "foo" && bar.name === "baz" && typeof qux.name === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
No
Error
Error
Error
Error
Error
Error
function(){
var foo = class {}; var bar = class baz {}; var qux = class { static name() {} }; return foo.name === "foo" && bar.name === "baz" && typeof qux.name === "function";
}
ยงobject methods (class)
?
function(){
var o = { foo: class {}, bar: class baz {}}; o.qux = class {}; return o.foo.name === "foo" && o.bar.name === "baz" && o.qux.name === "";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
No
Error
Error
Error
Error
Error
Error
function(){
var o = { foo: class {}, bar: class baz {}}; o.qux = class {}; return o.foo.name === "foo" && o.bar.name === "baz" && o.qux.name === "";
}
ยงclass prototype methods
?
function(){
class C { foo(){} }; return (new C).foo.name === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { foo(){} }; return (new C).foo.name === "foo";
}
ยงclass static methods
?
function(){
class C { static foo(){} }; return C.foo.name === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C { static foo(){} }; return C.foo.name === "foo";
}
ยงisn't writable, is configurable
?
function(){
var descriptor = Object.getOwnPropertyDescriptor(function f(){},"name"); return descriptor.enumerable === false && descriptor.writable === false && descriptor.configurable === true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
var descriptor = Object.getOwnPropertyDescriptor(function f(){},"name"); return descriptor.enumerable === false && descriptor.writable === false && descriptor.configurable === true;
}

String static methods

ยงString.raw
?
function(){
return typeof String.raw === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof String.raw === 'function';
}
ยงString.fromCodePoint
?
function(){
return typeof String.fromCodePoint === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
return typeof String.fromCodePoint === 'function';
}

String.prototype methods

ยงString.prototype.codePointAt
?
function(){
return typeof String.prototype.codePointAt === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
return typeof String.prototype.codePointAt === 'function';
}
ยงString.prototype.normalize
?
function(){
return typeof String.prototype.normalize === "function" && "c\u0327\u0301".normalize("NFC") === "\u1e09" && "\u1e09".normalize("NFD") === "c\u0327\u0301";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof String.prototype.normalize === "function" && "c\u0327\u0301".normalize("NFC") === "\u1e09" && "\u1e09".normalize("NFD") === "c\u0327\u0301";
}
ยงString.prototype.repeat
?
function(){
return typeof String.prototype.repeat === 'function' && "foo".repeat(3) === "foofoofoo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
return typeof String.prototype.repeat === 'function' && "foo".repeat(3) === "foofoofoo";
}
ยงString.prototype.startsWith
?
function(){
return typeof String.prototype.startsWith === 'function' && "foobar".startsWith("foo");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
return typeof String.prototype.startsWith === 'function' && "foobar".startsWith("foo");
}
ยงString.prototype.startsWith throws on RegExp
?
function(){
try { "a".startsWith(/./); } catch(e) { return typeof String.prototype.startsWith === 'function'; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
try { "a".startsWith(/./); } catch(e) { return typeof String.prototype.startsWith === 'function'; }
}
ยงString.prototype.endsWith
?
function(){
return typeof String.prototype.endsWith === 'function' && "foobar".endsWith("bar");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
return typeof String.prototype.endsWith === 'function' && "foobar".endsWith("bar");
}
ยงString.prototype.endsWith throws on RegExp
?
function(){
try { "a".endsWith(/./); } catch(e) { return typeof String.prototype.endsWith === 'function'; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
function(){
try { "a".endsWith(/./); } catch(e) { return typeof String.prototype.endsWith === 'function'; }
}
ยงString.prototype.includes
?
function(){
return typeof String.prototype.includes === 'function' && "foobar".includes("oba");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof String.prototype.includes === 'function' && "foobar".includes("oba");
}
ยงString.prototype[Symbol.iterator]
?
function(){
return typeof String.prototype[Symbol.iterator] === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return typeof String.prototype[Symbol.iterator] === 'function';
}
ยงString iterator prototype chain
?
function(){
// Iterator instance var iterator = ''[Symbol.iterator](); // %StringIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
function(){
// Iterator instance var iterator = ''[Symbol.iterator](); // %StringIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}

RegExp.prototype properties

ยงRegExp.prototype.flags
?
function(){
return /./igm.flags === "gim" && /./.flags === "";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
return /./igm.flags === "gim" && /./.flags === "";
}
ยงRegExp.prototype[Symbol.match]
?
function(){
return typeof RegExp.prototype[Symbol.match] === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
return typeof RegExp.prototype[Symbol.match] === 'function';
}
ยงRegExp.prototype[Symbol.replace]
?
function(){
return typeof RegExp.prototype[Symbol.replace] === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
return typeof RegExp.prototype[Symbol.replace] === 'function';
}
ยงRegExp.prototype[Symbol.split]
?
function(){
return typeof RegExp.prototype[Symbol.split] === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
return typeof RegExp.prototype[Symbol.split] === 'function';
}
ยงRegExp.prototype[Symbol.search]
?
function(){
return typeof RegExp.prototype[Symbol.search] === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
function(){
return typeof RegExp.prototype[Symbol.search] === 'function';
}
ยงRegExp[Symbol.species]
?
function(){
var prop = Object.getOwnPropertyDescriptor(RegExp, Symbol.species); return 'get' in prop && RegExp[Symbol.species] === RegExp;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var prop = Object.getOwnPropertyDescriptor(RegExp, Symbol.species); return 'get' in prop && RegExp[Symbol.species] === RegExp;
}

Array static methods

ยงArray.from, array-like objects
?
function(){
return Array.from({ 0: "foo", 1: "bar", length: 2 }) + '' === "foo,bar";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
return Array.from({ 0: "foo", 1: "bar", length: 2 }) + '' === "foo,bar";
}
ยงArray.from, generator instances
?
function(){
var iterable = (function*(){ yield 1; yield 2; yield 3; }()); return Array.from(iterable) + '' === "1,2,3";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var iterable = (function*(){ yield 1; yield 2; yield 3; }()); return Array.from(iterable) + '' === "1,2,3";
}
ยงArray.from, generic iterables
?
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Array.from(iterable) + '' === "1,2,3";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Array.from(iterable) + '' === "1,2,3";
}
ยงArray.from, instances of generic iterables
?
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Array.from(Object.create(iterable)) + '' === "1,2,3";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject([1, 2, 3]); return Array.from(Object.create(iterable)) + '' === "1,2,3";
}
ยงArray.from map function, array-like objects
?
function(){
return Array.from({ 0: "foo", 1: "bar", length: 2 }, function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
return Array.from({ 0: "foo", 1: "bar", length: 2 }, function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1";
}
ยงArray.from map function, generator instances
?
function(){
var iterable = (function*(){ yield "foo"; yield "bar"; yield "bal"; }()); return Array.from(iterable, function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1,bald2";
}
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Yes
Yes
Yes
Error
Error
Error
Error
function(){
var iterable = (function*(){ yield "foo"; yield "bar"; yield "bal"; }()); return Array.from(iterable, function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1,bald2";
}
ยงArray.from map function, generic iterables
?
function(){
var iterable = global.__createIterableObject(["foo", "bar", "bal"]); return Array.from(iterable, function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1,bald2";
}
Yes
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Yes
Yes
Yes
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject(["foo", "bar", "bal"]); return Array.from(iterable, function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1,bald2";
}
ยงArray.from map function, instances of iterables
?
function(){
var iterable = global.__createIterableObject(["foo", "bar", "bal"]); return Array.from(Object.create(iterable), function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1,bald2";
}
Yes
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Yes
Yes
Yes
Error
Error
Error
Error
function(){
var iterable = global.__createIterableObject(["foo", "bar", "bal"]); return Array.from(Object.create(iterable), function(e, i) { return e + this.baz + i; }, { baz: "d" }) + '' === "food0,bard1,bald2";
}
ยงArray.from, iterator closing
?
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { Array.from(iter, function() { throw 42 }); } catch(e){} return closed;
}
Yes
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No
No
No
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No
No
No
No
function(){
var closed = false; var iter = global.__createIterableObject([1, 2, 3], { 'return': function(){ closed = true; return {}; } }); try { Array.from(iter, function() { throw 42 }); } catch(e){} return closed;
}
ยงArray.of
?
function(){
return typeof Array.of === 'function' && Array.of(2)[0] === 2;
}
Yes
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Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
return typeof Array.of === 'function' && Array.of(2)[0] === 2;
}
ยงArray[Symbol.species]
?
function(){
var prop = Object.getOwnPropertyDescriptor(Array, Symbol.species); return 'get' in prop && Array[Symbol.species] === Array;
}
Yes
Yes
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Yes
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Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var prop = Object.getOwnPropertyDescriptor(Array, Symbol.species); return 'get' in prop && Array[Symbol.species] === Array;
}

Array.prototype methods

ยงArray.prototype.copyWithin
?
function(){
return typeof Array.prototype.copyWithin === 'function';
}
Yes
Yes
Yes
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No
No
No
No
function(){
return typeof Array.prototype.copyWithin === 'function';
}
ยงArray.prototype.find
?
function(){
return typeof Array.prototype.find === 'function';
}
Yes
Yes
Yes
Yes
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Yes
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Yes
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No
Flag
No
No
function(){
return typeof Array.prototype.find === 'function';
}
ยงArray.prototype.findIndex
?
function(){
return typeof Array.prototype.findIndex === 'function';
}
Yes
Yes
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Yes
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Yes
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No
Flag
No
No
function(){
return typeof Array.prototype.findIndex === 'function';
}
ยงArray.prototype.fill
?
function(){
return typeof Array.prototype.fill === 'function';
}
Yes
Yes
Yes
Yes
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No
Flag
No
No
function(){
return typeof Array.prototype.fill === 'function';
}
ยงArray.prototype.keys
?
function(){
return typeof Array.prototype.keys === 'function';
}
Yes
Yes
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Yes
No
No
function(){
return typeof Array.prototype.keys === 'function';
}
ยงArray.prototype.values
?
function(){
return typeof Array.prototype.values === 'function';
}
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Yes
Yes
No
No
function(){
return typeof Array.prototype.values === 'function';
}
ยงArray.prototype.entries
?
function(){
return typeof Array.prototype.entries === 'function';
}
Yes
Yes
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No
No
function(){
return typeof Array.prototype.entries === 'function';
}
ยงArray.prototype.splice
?
function(){
if ([0, 1, 2].splice(0).length !== 3) { // IE <= 8 and other pre-ES6 engines fail this check return false; } var a = [1, 2]; var result = a.splice(); if (a.length !== 2 || result.length !== 0) { // Safari 5.0 has this bug return false; } var obj = {}; Array.prototype.splice.call(obj, 0, 0, 1); if (obj.length !== 1) { return false; } var spliceWorksWithLargeSparseArrays = (function () { // Per https://github.com/es-shims/es5-shim/issues/295 // Safari 7/8 breaks with sparse arrays of size 1e5 or greater var arr = new Array(1e5); // note: the index MUST be 8 or larger or the test will false pass arr[8] = 'x'; arr.splice(1, 1); for (var i = 0; i < arr.length; i += 1) { if (arr[i] === 'x') { return i === 7; } } return false; }()); var spliceWorksWithSmallSparseArrays = (function () { // Per https://github.com/es-shims/es5-shim/issues/295 // Opera 12.15 breaks on this, no idea why. var n = 256; var arr = []; arr[n] = 'a'; arr.splice(n + 1, 0, 'b'); return arr[n] === 'a'; }()); return spliceWorksWithLargeSparseArrays && spliceWorksWithSmallSparseArrays;
}
Yes
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function(){
if ([0, 1, 2].splice(0).length !== 3) { // IE <= 8 and other pre-ES6 engines fail this check return false; } var a = [1, 2]; var result = a.splice(); if (a.length !== 2 || result.length !== 0) { // Safari 5.0 has this bug return false; } var obj = {}; Array.prototype.splice.call(obj, 0, 0, 1); if (obj.length !== 1) { return false; } var spliceWorksWithLargeSparseArrays = (function () { // Per https://github.com/es-shims/es5-shim/issues/295 // Safari 7/8 breaks with sparse arrays of size 1e5 or greater var arr = new Array(1e5); // note: the index MUST be 8 or larger or the test will false pass arr[8] = 'x'; arr.splice(1, 1); for (var i = 0; i < arr.length; i += 1) { if (arr[i] === 'x') { return i === 7; } } return false; }()); var spliceWorksWithSmallSparseArrays = (function () { // Per https://github.com/es-shims/es5-shim/issues/295 // Opera 12.15 breaks on this, no idea why. var n = 256; var arr = []; arr[n] = 'a'; arr.splice(n + 1, 0, 'b'); return arr[n] === 'a'; }()); return spliceWorksWithLargeSparseArrays && spliceWorksWithSmallSparseArrays;
}
ยงArray.prototype[Symbol.iterator]
?
function(){
return typeof Array.prototype[Symbol.iterator] === 'function';
}
Yes
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Error
Error
function(){
return typeof Array.prototype[Symbol.iterator] === 'function';
}
ยงArray iterator prototype chain
?
function(){
// Iterator instance var iterator = [][Symbol.iterator](); // %ArrayIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}
Yes
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Yes
Yes
Yes
No
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No
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No
Error
Error
function(){
// Iterator instance var iterator = [][Symbol.iterator](); // %ArrayIteratorPrototype% var proto1 = Object.getPrototypeOf(iterator); // %IteratorPrototype% var proto2 = Object.getPrototypeOf(proto1); return proto2.hasOwnProperty(Symbol.iterator) && !proto1 .hasOwnProperty(Symbol.iterator) && !iterator .hasOwnProperty(Symbol.iterator) && iterator[Symbol.iterator]() === iterator;
}
ยงArray.prototype[Symbol.unscopables]
?
function(){
var unscopables = Array.prototype[Symbol.unscopables]; if (!unscopables) { return false; } var ns = "find,findIndex,fill,copyWithin,entries,keys,values".split(","); for (var i = 0; i < ns.length; i++) { if (Array.prototype[ns[i]] && !unscopables[ns[i]]) return false; } return true;
}
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var unscopables = Array.prototype[Symbol.unscopables]; if (!unscopables) { return false; } var ns = "find,findIndex,fill,copyWithin,entries,keys,values".split(","); for (var i = 0; i < ns.length; i++) { if (Array.prototype[ns[i]] && !unscopables[ns[i]]) return false; } return true;
}

Number properties

ยงNumber.isFinite
?
function(){
return typeof Number.isFinite === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return typeof Number.isFinite === 'function';
}
ยงNumber.isInteger
?
function(){
return typeof Number.isInteger === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Number.isInteger === 'function';
}
ยงNumber.isSafeInteger
?
function(){
return typeof Number.isSafeInteger === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Number.isSafeInteger === 'function';
}
ยงNumber.isNaN
?
function(){
return typeof Number.isNaN === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return typeof Number.isNaN === 'function';
}
ยงNumber.parseFloat
?
function(){
var actualGlobal = Function('return this')(); return typeof Number.parseFloat === 'function' && Number.parseFloat === actualGlobal.parseFloat;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
var actualGlobal = Function('return this')(); return typeof Number.parseFloat === 'function' && Number.parseFloat === actualGlobal.parseFloat;
}
ยงNumber.parseInt
?
function(){
var actualGlobal = Function('return this')(); return typeof Number.parseInt === 'function' && Number.parseInt === actualGlobal.parseInt;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
var actualGlobal = Function('return this')(); return typeof Number.parseInt === 'function' && Number.parseInt === actualGlobal.parseInt;
}
ยงNumber.EPSILON
?
function(){
return typeof Number.EPSILON === 'number';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Number.EPSILON === 'number';
}
ยงNumber.MIN_SAFE_INTEGER
?
function(){
return typeof Number.MIN_SAFE_INTEGER === 'number';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Number.MIN_SAFE_INTEGER === 'number';
}
ยงNumber.MAX_SAFE_INTEGER
?
function(){
return typeof Number.MAX_SAFE_INTEGER === 'number';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Number.MAX_SAFE_INTEGER === 'number';
}

Math methods

ยงMath.clz32
?
function(){
return typeof Math.clz32 === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.clz32 === "function";
}
ยงMath.imul
?
function(){
return typeof Math.imul === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.imul === "function";
}
ยงMath.sign
?
function(){
return typeof Math.sign === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.sign === "function";
}
ยงMath.log10
?
function(){
return typeof Math.log10 === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.log10 === "function";
}
ยงMath.log2
?
function(){
return typeof Math.log2 === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.log2 === "function";
}
ยงMath.log1p
?
function(){
return typeof Math.log1p === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.log1p === "function";
}
ยงMath.expm1
?
function(){
return typeof Math.expm1 === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.expm1 === "function";
}
ยงMath.cosh
?
function(){
return typeof Math.cosh === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.cosh === "function";
}
ยงMath.sinh
?
function(){
return typeof Math.sinh === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.sinh === "function";
}
ยงMath.tanh
?
function(){
return typeof Math.tanh === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.tanh === "function";
}
ยงMath.acosh
?
function(){
return typeof Math.acosh === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.acosh === "function";
}
ยงMath.asinh
?
function(){
return typeof Math.asinh === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.asinh === "function";
}
ยงMath.atanh
?
function(){
return typeof Math.atanh === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.atanh === "function";
}
ยงMath.trunc
?
function(){
return typeof Math.trunc === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.trunc === "function";
}
ยงMath.fround
?
function(){
return typeof Math.fround === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.fround === "function";
}
ยงMath.cbrt
?
function(){
return typeof Math.cbrt === "function";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return typeof Math.cbrt === "function";
}
ยงMath.hypot
?
function(){
return Math.hypot() === 0 && Math.hypot(1) === 1 && Math.hypot(9, 12, 20) === 25 && Math.hypot(27, 36, 60, 100) === 125;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
return Math.hypot() === 0 && Math.hypot(1) === 1 && Math.hypot(9, 12, 20) === 25 && Math.hypot(27, 36, 60, 100) === 125;
}

ยงDate.prototype[Symbol.toPrimitive]
?
function(){
var tp = Date.prototype[Symbol.toPrimitive]; return tp.call(Object(2), "number") === 2 && tp.call(Object(2), "string") === "2" && tp.call(Object(2), "default") === "2";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var tp = Date.prototype[Symbol.toPrimitive]; return tp.call(Object(2), "number") === 2 && tp.call(Object(2), "string") === "2" && tp.call(Object(2), "default") === "2";
}

subclassing

Array is subclassable

ยงlength property (accessing)
?
function(){
class C extends Array {} var c = new C(); var len1 = c.length; c[2] = 'foo'; var len2 = c.length; return len1 === 0 && len2 === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); var len1 = c.length; c[2] = 'foo'; var len2 = c.length; return len1 === 0 && len2 === 3;
}
ยงlength property (setting)
?
function(){
class C extends Array {} var c = new C(); c[2] = 'foo'; c.length = 1; return c.length === 1 && !(2 in c);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); c[2] = 'foo'; c.length = 1; return c.length === 1 && !(2 in c);
}
ยงcorrect prototype chain
?
function(){
class C extends Array {} var c = new C(); return c instanceof C && c instanceof Array && Object.getPrototypeOf(C) === Array;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); return c instanceof C && c instanceof Array && Object.getPrototypeOf(C) === Array;
}
ยงArray.isArray support
?
function(){
class C extends Array {} return Array.isArray(new C());
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} return Array.isArray(new C());
}
ยงArray.prototype.concat
?
function(){
class C extends Array {} var c = new C(); return c.concat(1) instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); return c.concat(1) instanceof C;
}
ยงArray.prototype.filter
?
function(){
class C extends Array {} var c = new C(); return c.filter(Boolean) instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); return c.filter(Boolean) instanceof C;
}
ยงArray.prototype.map
?
function(){
class C extends Array {} var c = new C(); return c.map(Boolean) instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); return c.map(Boolean) instanceof C;
}
ยงArray.prototype.slice
?
function(){
class C extends Array {} var c = new C(); c.push(2,4,6); return c.slice(1,2) instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); c.push(2,4,6); return c.slice(1,2) instanceof C;
}
ยงArray.prototype.splice
?
function(){
class C extends Array {} var c = new C(); c.push(2,4,6); return c.splice(1,2) instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} var c = new C(); c.push(2,4,6); return c.splice(1,2) instanceof C;
}
ยงArray.from
?
function(){
class C extends Array {} return C.from({ length: 0 }) instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} return C.from({ length: 0 }) instanceof C;
}
ยงArray.of
?
function(){
class C extends Array {} return C.of(0) instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Array {} return C.of(0) instanceof C;
}

RegExp is subclassable

ยงbasic functionality
?
function(){
class R extends RegExp {} var r = new R("baz","g"); return r.global && r.source === "baz";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class R extends RegExp {} var r = new R("baz","g"); return r.global && r.source === "baz";
}
ยงcorrect prototype chain
?
function(){
class R extends RegExp {} var r = new R("baz","g"); return r instanceof R && r instanceof RegExp && Object.getPrototypeOf(R) === RegExp;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class R extends RegExp {} var r = new R("baz","g"); return r instanceof R && r instanceof RegExp && Object.getPrototypeOf(R) === RegExp;
}
ยงRegExp.prototype.exec
?
function(){
class R extends RegExp {} var r = new R("baz","g"); return r.exec("foobarbaz")[0] === "baz" && r.lastIndex === 9;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class R extends RegExp {} var r = new R("baz","g"); return r.exec("foobarbaz")[0] === "baz" && r.lastIndex === 9;
}
ยงRegExp.prototype.test
?
function(){
class R extends RegExp {} var r = new R("baz"); return r.test("foobarbaz");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class R extends RegExp {} var r = new R("baz"); return r.test("foobarbaz");
}

Function is subclassable

ยงcan be called
?
function(){
class C extends Function {} var c = new C("return 'foo';"); return c() === 'foo';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Function {} var c = new C("return 'foo';"); return c() === 'foo';
}
ยงcorrect prototype chain
?
function(){
class C extends Function {} var c = new C("return 'foo';"); return c instanceof C && c instanceof Function && Object.getPrototypeOf(C) === Function;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends Function {} var c = new C("return 'foo';"); return c instanceof C && c instanceof Function && Object.getPrototypeOf(C) === Function;
}
ยงcan be used with "new"
?
function(){
class C extends Function {} var c = new C("this.bar = 2;"); c.prototype.baz = 3; return new c().bar === 2 && new c().baz === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Function {} var c = new C("this.bar = 2;"); c.prototype.baz = 3; return new c().bar === 2 && new c().baz === 3;
}
ยงFunction.prototype.call
?
function(){
class C extends Function {} var c = new C("x", "return this.bar + x;"); return c.call({bar:1}, 2) === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Function {} var c = new C("x", "return this.bar + x;"); return c.call({bar:1}, 2) === 3;
}
ยงFunction.prototype.apply
?
function(){
class C extends Function {} var c = new C("x", "return this.bar + x;"); return c.apply({bar:1}, [2]) === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Function {} var c = new C("x", "return this.bar + x;"); return c.apply({bar:1}, [2]) === 3;
}
ยงFunction.prototype.bind
?
function(){
class C extends Function {} var c = new C("x", "y", "return this.bar + x + y;").bind({bar:1}, 2); return c(6) === 9 && c instanceof C;
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends Function {} var c = new C("x", "y", "return this.bar + x + y;").bind({bar:1}, 2); return c(6) === 9 && c instanceof C;
}

Promise is subclassable

ยงbasic functionality
?
function(){
class P extends Promise {} var p1 = new P(function(resolve, reject) { resolve("foo"); }); var p2 = new P(function(resolve, reject) { reject("quux"); }); var score = +(p1 instanceof P); function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "quux"); check(); } function shouldNotRun(result) { score = -Infinity; } p1.then(thenFn, shouldNotRun); p2.then(shouldNotRun, catchFn); p1.catch(shouldNotRun); p2.catch(catchFn); p1.then(function() { // P.prototype.then() should return a new P score += p1.then() instanceof P && p1.then() !== p1; check(); }); function check() { if (score === 5) asyncTestPassed(); }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class P extends Promise {} var p1 = new P(function(resolve, reject) { resolve("foo"); }); var p2 = new P(function(resolve, reject) { reject("quux"); }); var score = +(p1 instanceof P); function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "quux"); check(); } function shouldNotRun(result) { score = -Infinity; } p1.then(thenFn, shouldNotRun); p2.then(shouldNotRun, catchFn); p1.catch(shouldNotRun); p2.catch(catchFn); p1.then(function() { // P.prototype.then() should return a new P score += p1.then() instanceof P && p1.then() !== p1; check(); }); function check() { if (score === 5) asyncTestPassed(); }
}
ยงcorrect prototype chain
?
function(){
class C extends Promise {} var c = new C(function(resolve, reject) { resolve("foo"); }); return c instanceof C && c instanceof Promise && Object.getPrototypeOf(C) === Promise;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Promise {} var c = new C(function(resolve, reject) { resolve("foo"); }); return c instanceof C && c instanceof Promise && Object.getPrototypeOf(C) === Promise;
}
ยงPromise.all
?
function(){
class P extends Promise {} var fulfills = P.all([ new Promise(function(resolve) { setTimeout(resolve,2000,"foo"); }), new Promise(function(resolve) { setTimeout(resolve,1000,"bar"); }) ]); var rejects = P.all([ new Promise(function(_, reject) { setTimeout(reject, 2000,"baz"); }), new Promise(function(_, reject) { setTimeout(reject, 1000,"qux"); }) ]); var score = +(fulfills instanceof P); fulfills.then(function(result) { score += (result + "" === "foo,bar"); check(); }); rejects.catch(function(result) { score += (result === "qux"); check(); }); function check() { if (score === 3) asyncTestPassed(); }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class P extends Promise {} var fulfills = P.all([ new Promise(function(resolve) { setTimeout(resolve,2000,"foo"); }), new Promise(function(resolve) { setTimeout(resolve,1000,"bar"); }) ]); var rejects = P.all([ new Promise(function(_, reject) { setTimeout(reject, 2000,"baz"); }), new Promise(function(_, reject) { setTimeout(reject, 1000,"qux"); }) ]); var score = +(fulfills instanceof P); fulfills.then(function(result) { score += (result + "" === "foo,bar"); check(); }); rejects.catch(function(result) { score += (result === "qux"); check(); }); function check() { if (score === 3) asyncTestPassed(); }
}
ยงPromise.race
?
function(){
class P extends Promise {} var fulfills = P.race([ new Promise(function(resolve) { setTimeout(resolve,1000,"foo"); }), new Promise(function(_, reject) { setTimeout(reject, 2000,"bar"); }) ]); var rejects = P.race([ new Promise(function(_, reject) { setTimeout(reject, 1000,"baz"); }), new Promise(function(resolve) { setTimeout(resolve,2000,"qux"); }) ]); var score = +(fulfills instanceof P); fulfills.then(function(result) { score += (result === "foo"); check(); }); rejects.catch(function(result) { score += (result === "baz"); check(); }); function check() { if (score === 3) asyncTestPassed(); }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class P extends Promise {} var fulfills = P.race([ new Promise(function(resolve) { setTimeout(resolve,1000,"foo"); }), new Promise(function(_, reject) { setTimeout(reject, 2000,"bar"); }) ]); var rejects = P.race([ new Promise(function(_, reject) { setTimeout(reject, 1000,"baz"); }), new Promise(function(resolve) { setTimeout(resolve,2000,"qux"); }) ]); var score = +(fulfills instanceof P); fulfills.then(function(result) { score += (result === "foo"); check(); }); rejects.catch(function(result) { score += (result === "baz"); check(); }); function check() { if (score === 3) asyncTestPassed(); }
}

miscellaneous subclassables

ยงBoolean is subclassable
?
function(){
class C extends Boolean {} var c = new C(true); return c instanceof Boolean && c instanceof C && c == true; // eslint-disable-line eqeqeq
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Boolean {} var c = new C(true); return c instanceof Boolean && c instanceof C && c == true; // eslint-disable-line eqeqeq
}
ยงNumber is subclassable
?
function(){
class C extends Number {} var c = new C(6); return c instanceof Number && c instanceof C && +c === 6;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Number {} var c = new C(6); return c instanceof Number && c instanceof C && +c === 6;
}
ยงString is subclassable
?
function(){
class C extends String {} var c = new C("golly"); return c instanceof String && c instanceof C && c + '' === "golly" && c[0] === "g" && c.length === 5;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
No
Error
Error
Error
Error
Error
Error
function(){
class C extends String {} var c = new C("golly"); return c instanceof String && c instanceof C && c + '' === "golly" && c[0] === "g" && c.length === 5;
}
ยงError is subclassable
?
function(){
class C extends Error {} var c = new C(); return c instanceof Error && c instanceof C && Object.prototype.toString.call(c) === "[object Error]";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
class C extends Error {} var c = new C(); return c instanceof Error && c instanceof C && Object.prototype.toString.call(c) === "[object Error]";
}
ยงMap is subclassable
?
function(){
var key = {}; class M extends Map {} var map = new M(); map.set(key, 123); return map instanceof M && map.has(key) && map.get(key) === 123;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var key = {}; class M extends Map {} var map = new M(); map.set(key, 123); return map instanceof M && map.has(key) && map.get(key) === 123;
}
ยงSet is subclassable
?
function(){
var obj = {}; class S extends Set {} var set = new S(); set.add(123); set.add(123); return set instanceof S && set.has(123);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
var obj = {}; class S extends Set {} var set = new S(); set.add(123); set.add(123); return set instanceof S && set.has(123);
}

misc

prototype of bound functions

ยงbasic functions
?
function(){
function correctProtoBound(proto) { var f = function(){}; if (Object.setPrototypeOf) { Object.setPrototypeOf(f, proto); } else { f.__proto__ = proto; } var boundF = Function.prototype.bind.call(f, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
No
No
No
No
No
No
function(){
function correctProtoBound(proto) { var f = function(){}; if (Object.setPrototypeOf) { Object.setPrototypeOf(f, proto); } else { f.__proto__ = proto; } var boundF = Function.prototype.bind.call(f, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
ยงgenerator functions
?
function(){
function correctProtoBound(proto) { var f = function*(){}; if (Object.setPrototypeOf) { Object.setPrototypeOf(f, proto); } else { f.__proto__ = proto; } var boundF = Function.prototype.bind.call(f, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
No
Error
Error
function(){
function correctProtoBound(proto) { var f = function*(){}; if (Object.setPrototypeOf) { Object.setPrototypeOf(f, proto); } else { f.__proto__ = proto; } var boundF = Function.prototype.bind.call(f, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
ยงarrow functions
?
function(){
function correctProtoBound(proto) { var f = ()=>5; if (Object.setPrototypeOf) { Object.setPrototypeOf(f, proto); } else { f.__proto__ = proto; } var boundF = Function.prototype.bind.call(f, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
No
No
Error
No
Error
Error
function(){
function correctProtoBound(proto) { var f = ()=>5; if (Object.setPrototypeOf) { Object.setPrototypeOf(f, proto); } else { f.__proto__ = proto; } var boundF = Function.prototype.bind.call(f, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
ยงclasses
?
function(){
function correctProtoBound(proto) { class C {} if (Object.setPrototypeOf) { Object.setPrototypeOf(C, proto); } else { C.__proto__ = proto; } var boundF = Function.prototype.bind.call(C, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
function correctProtoBound(proto) { class C {} if (Object.setPrototypeOf) { Object.setPrototypeOf(C, proto); } else { C.__proto__ = proto; } var boundF = Function.prototype.bind.call(C, null); return Object.getPrototypeOf(boundF) === proto; } return correctProtoBound(Function.prototype) && correctProtoBound({}) && correctProtoBound(null);
}
ยงsubclasses
?
function(){
function correctProtoBound(superclass) { class C extends superclass { constructor() { return Object.create(null); } } var boundF = Function.prototype.bind.call(C, null); return Object.getPrototypeOf(boundF) === Object.getPrototypeOf(C); } return correctProtoBound(function(){}) && correctProtoBound(Array) && correctProtoBound(null);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
function(){
function correctProtoBound(superclass) { class C extends superclass { constructor() { return Object.create(null); } } var boundF = Function.prototype.bind.call(C, null); return Object.getPrototypeOf(boundF) === Object.getPrototypeOf(C); } return correctProtoBound(function(){}) && correctProtoBound(Array) && correctProtoBound(null);
}

Proxy, internal 'get' calls

ยงToPrimitive
?
function(){
// ToPrimitive -> Get -> [[Get]] var get = []; var p = new Proxy({toString:Function()}, { get: function(o, k) { get.push(k); return o[k]; }}); p + 3; return get[0] === Symbol.toPrimitive && get.slice(1) + '' === "valueOf,toString";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// ToPrimitive -> Get -> [[Get]] var get = []; var p = new Proxy({toString:Function()}, { get: function(o, k) { get.push(k); return o[k]; }}); p + 3; return get[0] === Symbol.toPrimitive && get.slice(1) + '' === "valueOf,toString";
}
ยงCreateListFromArrayLike
?
function(){
// CreateListFromArrayLike -> Get -> [[Get]] var get = []; var p = new Proxy({length:2, 0:0, 1:0}, { get: function(o, k) { get.push(k); return o[k]; }}); Function.prototype.apply({}, p); return get + '' === "length,0,1";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// CreateListFromArrayLike -> Get -> [[Get]] var get = []; var p = new Proxy({length:2, 0:0, 1:0}, { get: function(o, k) { get.push(k); return o[k]; }}); Function.prototype.apply({}, p); return get + '' === "length,0,1";
}
ยงinstanceof operator
?
function(){
// InstanceofOperator -> GetMethod -> GetV -> [[Get]] // InstanceofOperator -> OrdinaryHasInstance -> Get -> [[Get]] var get = []; var p = new Proxy(Function(), { get: function(o, k) { get.push(k); return o[k]; }}); ({}) instanceof p; return get[0] === Symbol.hasInstance && get.slice(1) + '' === "prototype";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// InstanceofOperator -> GetMethod -> GetV -> [[Get]] // InstanceofOperator -> OrdinaryHasInstance -> Get -> [[Get]] var get = []; var p = new Proxy(Function(), { get: function(o, k) { get.push(k); return o[k]; }}); ({}) instanceof p; return get[0] === Symbol.hasInstance && get.slice(1) + '' === "prototype";
}
ยงHasBinding
?
function(){
// HasBinding -> Get -> [[Get]] var get = []; var p = new Proxy({foo:1}, { get: function(o, k) { get.push(k); return o[k]; }}); p[Symbol.unscopables] = p; with(p) { typeof foo; } return get[0] === Symbol.unscopables && get.slice(1) + '' === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// HasBinding -> Get -> [[Get]] var get = []; var p = new Proxy({foo:1}, { get: function(o, k) { get.push(k); return o[k]; }}); p[Symbol.unscopables] = p; with(p) { typeof foo; } return get[0] === Symbol.unscopables && get.slice(1) + '' === "foo";
}
ยงCreateDynamicFunction
?
function(){
// CreateDynamicFunction -> GetPrototypeFromConstructor -> Get -> [[Get]] var get = []; var p = new Proxy(Function, { get: function(o, k) { get.push(k); return o[k]; }}); new p; return get + '' === "prototype";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// CreateDynamicFunction -> GetPrototypeFromConstructor -> Get -> [[Get]] var get = []; var p = new Proxy(Function, { get: function(o, k) { get.push(k); return o[k]; }}); new p; return get + '' === "prototype";
}
ยงClassDefinitionEvaluation
?
function(){
// ClassDefinitionEvaluation -> Get -> [[Get]] var get = []; var p = new Proxy(Function(), { get: function(o, k) { get.push(k); return o[k]; }}); class C extends p {} return get + '' === "prototype";
}
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// ClassDefinitionEvaluation -> Get -> [[Get]] var get = []; var p = new Proxy(Function(), { get: function(o, k) { get.push(k); return o[k]; }}); class C extends p {} return get + '' === "prototype";
}
ยงIteratorComplete, IteratorValue
?
function(){
// IteratorComplete -> Get -> [[Get]] // IteratorValue -> Get -> [[Get]] var get = []; var iterable = {}; iterable[Symbol.iterator] = function() { return { next: function() { return new Proxy({ value: 2, done: false }, { get: function(o, k) { get.push(k); return o[k]; }}); } }; } var i = 0; for(var e of iterable) { if (++i >= 2) break; } return get + '' === "done,value,done,value";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// IteratorComplete -> Get -> [[Get]] // IteratorValue -> Get -> [[Get]] var get = []; var iterable = {}; iterable[Symbol.iterator] = function() { return { next: function() { return new Proxy({ value: 2, done: false }, { get: function(o, k) { get.push(k); return o[k]; }}); } }; } var i = 0; for(var e of iterable) { if (++i >= 2) break; } return get + '' === "done,value,done,value";
}
ยงToPropertyDescriptor
?
function(){
// ToPropertyDescriptor -> Get -> [[Get]] var get = []; var p = new Proxy({ enumerable: true, configurable: true, value: true, writable: true, get: Function(), set: Function() }, { get: function(o, k) { get.push(k); return o[k]; }}); try { // This will throw, since it will have true for both "get" and "value", // but not before performing a Get on every property. Object.defineProperty({}, "foo", p); } catch(e) { return get + '' === "enumerable,configurable,value,writable,get,set"; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// ToPropertyDescriptor -> Get -> [[Get]] var get = []; var p = new Proxy({ enumerable: true, configurable: true, value: true, writable: true, get: Function(), set: Function() }, { get: function(o, k) { get.push(k); return o[k]; }}); try { // This will throw, since it will have true for both "get" and "value", // but not before performing a Get on every property. Object.defineProperty({}, "foo", p); } catch(e) { return get + '' === "enumerable,configurable,value,writable,get,set"; }
}
ยงObject.assign
?
function(){
// Object.assign -> Get -> [[Get]] var get = []; var p = new Proxy({foo:1, bar:2}, { get: function(o, k) { get.push(k); return o[k]; }}); Object.assign({}, p); return get + '' === "foo,bar";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Object.assign -> Get -> [[Get]] var get = []; var p = new Proxy({foo:1, bar:2}, { get: function(o, k) { get.push(k); return o[k]; }}); Object.assign({}, p); return get + '' === "foo,bar";
}
ยงObject.defineProperties
?
function(){
// Object.defineProperties -> Get -> [[Get]] var get = []; var p = new Proxy({foo:{}, bar:{}}, { get: function(o, k) { get.push(k); return o[k]; }}); Object.defineProperties({}, p); return get + '' === "foo,bar";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Object.defineProperties -> Get -> [[Get]] var get = []; var p = new Proxy({foo:{}, bar:{}}, { get: function(o, k) { get.push(k); return o[k]; }}); Object.defineProperties({}, p); return get + '' === "foo,bar";
}
ยงFunction.prototype.bind
?
function(){
// Function.prototype.bind -> Get -> [[Get]] var get = []; var p = new Proxy(Function(), { get: function(o, k) { get.push(k); return o[k]; }}); Function.prototype.bind.call(p); return get + '' === "length,name";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Function.prototype.bind -> Get -> [[Get]] var get = []; var p = new Proxy(Function(), { get: function(o, k) { get.push(k); return o[k]; }}); Function.prototype.bind.call(p); return get + '' === "length,name";
}
ยงError.prototype.toString
?
function(){
// Error.prototype.toString -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); Error.prototype.toString.call(p); return get + '' === "name,message";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Error.prototype.toString -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); Error.prototype.toString.call(p); return get + '' === "name,message";
}
ยงString.raw
?
function(){
// String.raw -> Get -> [[Get]] var get = []; var raw = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }}); var p = new Proxy({raw: raw}, { get: function(o, k) { get.push(k); return o[k]; }}); String.raw(p); return get + '' === "raw,length,0,1";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// String.raw -> Get -> [[Get]] var get = []; var raw = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }}); var p = new Proxy({raw: raw}, { get: function(o, k) { get.push(k); return o[k]; }}); String.raw(p); return get + '' === "raw,length,0,1";
}
ยงRegExp constructor
?
function(){
// RegExp -> Get -> [[Get]] var get = []; var re = { constructor: null }; re[Symbol.match] = true; var p = new Proxy(re, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp(p); return get[0] === Symbol.match && get.slice(1) + '' === "constructor,source,flags";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp -> Get -> [[Get]] var get = []; var re = { constructor: null }; re[Symbol.match] = true; var p = new Proxy(re, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp(p); return get[0] === Symbol.match && get.slice(1) + '' === "constructor,source,flags";
}
ยงRegExp.prototype.flags
?
function(){
// RegExp.prototype.flags -> Get -> [[Get]] var expected = []; // Sorted alphabetically by shortname โ€“ "gimsuy". if ('hasIndices' in RegExp.prototype) expected.push('hasIndices'); if ('global' in RegExp.prototype) expected.push('global'); if ('ignoreCase' in RegExp.prototype) expected.push('ignoreCase'); if ('multiline' in RegExp.prototype) expected.push('multiline'); if ('dotAll' in RegExp.prototype) expected.push('dotAll'); if ('unicode' in RegExp.prototype) expected.push('unicode'); if ('unicodeSets' in RegExp.prototype) expected.push('unicodeSets'); if ('sticky' in RegExp.prototype) expected.push('sticky'); var actual = []; var p = new Proxy({}, { get: function(o, k) { actual.push(k); return o[k]; }}); Object.getOwnPropertyDescriptor(RegExp.prototype, 'flags').get.call(p); if (expected.length !== actual.length) return false; for (var i = 0; i < expected.length; i++) { if (expected[i] !== actual[i]) return false; } return true;
}
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp.prototype.flags -> Get -> [[Get]] var expected = []; // Sorted alphabetically by shortname โ€“ "gimsuy". if ('hasIndices' in RegExp.prototype) expected.push('hasIndices'); if ('global' in RegExp.prototype) expected.push('global'); if ('ignoreCase' in RegExp.prototype) expected.push('ignoreCase'); if ('multiline' in RegExp.prototype) expected.push('multiline'); if ('dotAll' in RegExp.prototype) expected.push('dotAll'); if ('unicode' in RegExp.prototype) expected.push('unicode'); if ('unicodeSets' in RegExp.prototype) expected.push('unicodeSets'); if ('sticky' in RegExp.prototype) expected.push('sticky'); var actual = []; var p = new Proxy({}, { get: function(o, k) { actual.push(k); return o[k]; }}); Object.getOwnPropertyDescriptor(RegExp.prototype, 'flags').get.call(p); if (expected.length !== actual.length) return false; for (var i = 0; i < expected.length; i++) { if (expected[i] !== actual[i]) return false; } return true;
}
ยงRegExp.prototype.test
?
function(){
// RegExp.prototype.test -> RegExpExec -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype.test.call(p); return get + '' === "exec";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp.prototype.test -> RegExpExec -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype.test.call(p); return get + '' === "exec";
}
ยงRegExp.prototype.toString
?
function(){
// RegExp.prototype.toString -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype.toString.call(p); return get + '' === "source,flags";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp.prototype.toString -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype.toString.call(p); return get + '' === "source,flags";
}
ยงRegExp.prototype[Symbol.match]
?
function(){
// RegExp.prototype[Symbol.match] -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.match].call(p); p.global = true; p.unicode = true; RegExp.prototype[Symbol.match].call(p); var str = get + ''; return str === "global,exec,global,unicode,exec" || str === 'flags,exec,flags,exec';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp.prototype[Symbol.match] -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.match].call(p); p.global = true; p.unicode = true; RegExp.prototype[Symbol.match].call(p); var str = get + ''; return str === "global,exec,global,unicode,exec" || str === 'flags,exec,flags,exec';
}
ยงRegExp.prototype[Symbol.replace]
?
function(){
// RegExp.prototype[Symbol.replace] -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.replace].call(p); p.global = true; RegExp.prototype[Symbol.replace].call(p); var str = get + ''; return str === "global,exec,global,unicode,exec" || str === 'flags,exec,flags,exec';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp.prototype[Symbol.replace] -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.replace].call(p); p.global = true; RegExp.prototype[Symbol.replace].call(p); var str = get + ''; return str === "global,exec,global,unicode,exec" || str === 'flags,exec,flags,exec';
}
ยงRegExp.prototype[Symbol.search]
?
function(){
// RegExp.prototype[Symbol.search] -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.search].call(p); return get + '' === "lastIndex,exec,lastIndex";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp.prototype[Symbol.search] -> Get -> [[Get]] var get = []; var p = new Proxy({ exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.search].call(p); return get + '' === "lastIndex,exec,lastIndex";
}
ยงRegExp.prototype[Symbol.split]
?
function(){
// RegExp.prototype[Symbol.split] -> Get -> [[Get]] var get = []; var constructor = Function(); constructor[Symbol.species] = Object; var p = new Proxy({ constructor: constructor, flags: '', exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.split].call(p, ""); return get + '' === "constructor,flags,exec";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// RegExp.prototype[Symbol.split] -> Get -> [[Get]] var get = []; var constructor = Function(); constructor[Symbol.species] = Object; var p = new Proxy({ constructor: constructor, flags: '', exec: function() { return null; } }, { get: function(o, k) { get.push(k); return o[k]; }}); RegExp.prototype[Symbol.split].call(p, ""); return get + '' === "constructor,flags,exec";
}
ยงArray.from
?
function(){
// Array.from -> Get -> [[Get]] var get = []; var p = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }}); Array.from(p); return get[0] === Symbol.iterator && get.slice(1) + '' === "length,0,1";
}
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Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.from -> Get -> [[Get]] var get = []; var p = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }}); Array.from(p); return get[0] === Symbol.iterator && get.slice(1) + '' === "length,0,1";
}
ยงArray.prototype.concat
?
function(){
// Array.prototype.concat -> Get -> [[Get]] var get = []; var arr = [1]; arr.constructor = void undefined; var p = new Proxy(arr, { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.concat.call(p,p); return get[0] === "constructor" && get[1] === Symbol.isConcatSpreadable && get[2] === "length" && get[3] === "0" && get[4] === get[1] && get[5] === get[2] && get[6] === get[3] && get.length === 7;
}
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Yes
Yes
Yes
Yes
Yes
No
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype.concat -> Get -> [[Get]] var get = []; var arr = [1]; arr.constructor = void undefined; var p = new Proxy(arr, { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.concat.call(p,p); return get[0] === "constructor" && get[1] === Symbol.isConcatSpreadable && get[2] === "length" && get[3] === "0" && get[4] === get[1] && get[5] === get[2] && get[6] === get[3] && get.length === 7;
}
ยงArray.prototype iteration methods
?
function(){
// Array.prototype methods -> Get -> [[Get]] var methods = ['copyWithin', 'every', 'fill', 'filter', 'find', 'findIndex', 'forEach', 'indexOf', 'join', 'lastIndexOf', 'map', 'reduce', 'reduceRight', 'some']; var get; var p = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }}); for(var i = 0; i < methods.length; i+=1) { get = []; Array.prototype[methods[i]].call(p, Function()); if (get + '' !== ( methods[i] === 'fill' ? "length" : methods[i] === 'every' ? "length,0" : methods[i] === 'lastIndexOf' || methods[i] === 'reduceRight' ? "length,1,0" : "length,0,1" )) { return false; } } return true;
}
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Yes
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No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype methods -> Get -> [[Get]] var methods = ['copyWithin', 'every', 'fill', 'filter', 'find', 'findIndex', 'forEach', 'indexOf', 'join', 'lastIndexOf', 'map', 'reduce', 'reduceRight', 'some']; var get; var p = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }}); for(var i = 0; i < methods.length; i+=1) { get = []; Array.prototype[methods[i]].call(p, Function()); if (get + '' !== ( methods[i] === 'fill' ? "length" : methods[i] === 'every' ? "length,0" : methods[i] === 'lastIndexOf' || methods[i] === 'reduceRight' ? "length,1,0" : "length,0,1" )) { return false; } } return true;
}
ยงArray.prototype.pop
?
function(){
// Array.prototype.pop -> Get -> [[Get]] var get = []; var p = new Proxy([0,1,2,3], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.pop.call(p); return get + '' === "length,3";
}
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Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype.pop -> Get -> [[Get]] var get = []; var p = new Proxy([0,1,2,3], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.pop.call(p); return get + '' === "length,3";
}
ยงArray.prototype.reverse
?
function(){
// Array.prototype.reverse -> Get -> [[Get]] var get = []; var p = new Proxy([0,,2,,4,,], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.reverse.call(p); return get + '' === "length,0,4,2";
}
Yes
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Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype.reverse -> Get -> [[Get]] var get = []; var p = new Proxy([0,,2,,4,,], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.reverse.call(p); return get + '' === "length,0,4,2";
}
ยงArray.prototype.shift
?
function(){
// Array.prototype.shift -> Get -> [[Get]] var get = []; var p = new Proxy([0,1,2,3], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.shift.call(p); return get + '' === "length,0,1,2,3";
}
Yes
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Yes
Yes
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Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype.shift -> Get -> [[Get]] var get = []; var p = new Proxy([0,1,2,3], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.shift.call(p); return get + '' === "length,0,1,2,3";
}
ยงArray.prototype.splice
?
function(){
// Array.prototype.splice -> Get -> [[Get]] var get = []; var p = new Proxy([0,1,2,3], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.splice.call(p,1,1); Array.prototype.splice.call(p,1,0,1); return get + '' === "length,constructor,1,2,3,length,constructor,2,1";
}
Yes
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No
Flag
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype.splice -> Get -> [[Get]] var get = []; var p = new Proxy([0,1,2,3], { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.splice.call(p,1,1); Array.prototype.splice.call(p,1,0,1); return get + '' === "length,constructor,1,2,3,length,constructor,2,1";
}
ยงArray.prototype.toString
?
function(){
// Array.prototype.toString -> Get -> [[Get]] var get = []; var p = new Proxy({ join:Function() }, { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.toString.call(p); return get + '' === "join";
}
Yes
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Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype.toString -> Get -> [[Get]] var get = []; var p = new Proxy({ join:Function() }, { get: function(o, k) { get.push(k); return o[k]; }}); Array.prototype.toString.call(p); return get + '' === "join";
}
ยงJSON.stringify
?
function(){
// JSON.stringify -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); JSON.stringify(p); return get + '' === "toJSON";
}
Yes
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Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// JSON.stringify -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); JSON.stringify(p); return get + '' === "toJSON";
}
ยงPromise resolve functions
?
function(){
// Promise resolve functions -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); new Promise(function(resolve){ resolve(p); }); return get + '' === "then";
}
Yes
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Yes
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Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Promise resolve functions -> Get -> [[Get]] var get = []; var p = new Proxy({}, { get: function(o, k) { get.push(k); return o[k]; }}); new Promise(function(resolve){ resolve(p); }); return get + '' === "then";
}
ยงString.prototype.match
?
function(){
// String.prototype.match -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".match(p); return get[0] === Symbol.match && get[1] === Symbol.toPrimitive && get.length === 2;
}
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// String.prototype.match -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".match(p); return get[0] === Symbol.match && get[1] === Symbol.toPrimitive && get.length === 2;
}
ยงString.prototype.replace
?
function(){
// String.prototype.replace functions -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".replace(p); return get[0] === Symbol.replace && get[1] === Symbol.toPrimitive && get.length === 2;
}
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Yes
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Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// String.prototype.replace functions -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".replace(p); return get[0] === Symbol.replace && get[1] === Symbol.toPrimitive && get.length === 2;
}
ยงString.prototype.search
?
function(){
// String.prototype.search functions -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".search(p); return get[0] === Symbol.search && get[1] === Symbol.toPrimitive && get.length === 2;
}
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// String.prototype.search functions -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".search(p); return get[0] === Symbol.search && get[1] === Symbol.toPrimitive && get.length === 2;
}
ยงString.prototype.split
?
function(){
// String.prototype.split functions -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".split(p); return get[0] === Symbol.split && get[1] === Symbol.toPrimitive && get.length === 2;
}
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// String.prototype.split functions -> Get -> [[Get]] var get = []; var proxied = {}; proxied[Symbol.toPrimitive] = Function(); var p = new Proxy(proxied, { get: function(o, k) { get.push(k); return o[k]; }}); "".split(p); return get[0] === Symbol.split && get[1] === Symbol.toPrimitive && get.length === 2;
}
ยงDate.prototype.toJSON
?
function(){
// Date.prototype.toJSON -> ToPrimitive -> Get -> [[Get]] // Date.prototype.toJSON -> Invoke -> GetMethod -> GetV -> [[Get]] var get = []; var p = new Proxy({toString:Function(),toISOString:Function()}, { get: function(o, k) { get.push(k); return o[k]; }}); Date.prototype.toJSON.call(p); return get[0] === Symbol.toPrimitive && get.slice(1) + '' === "valueOf,toString,toISOString";
}
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function(){
// Date.prototype.toJSON -> ToPrimitive -> Get -> [[Get]] // Date.prototype.toJSON -> Invoke -> GetMethod -> GetV -> [[Get]] var get = []; var p = new Proxy({toString:Function(),toISOString:Function()}, { get: function(o, k) { get.push(k); return o[k]; }}); Date.prototype.toJSON.call(p); return get[0] === Symbol.toPrimitive && get.slice(1) + '' === "valueOf,toString,toISOString";
}

Proxy, internal 'set' calls

ยงObject.assign
?
function(){
// Object.assign -> Set -> [[Set]] var set = []; var p = new Proxy({}, { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); Object.assign(p, { foo: 1, bar: 2 }); return set + '' === "foo,bar";
}
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function(){
// Object.assign -> Set -> [[Set]] var set = []; var p = new Proxy({}, { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); Object.assign(p, { foo: 1, bar: 2 }); return set + '' === "foo,bar";
}
ยงArray.from
?
function(){
// Array.from -> Set -> [[Set]] var set = []; var p = new Proxy({}, { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); Array.from.call(function(){ return p; }, {length:2, 0:1, 1:2}); return set + '' === "length";
}
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function(){
// Array.from -> Set -> [[Set]] var set = []; var p = new Proxy({}, { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); Array.from.call(function(){ return p; }, {length:2, 0:1, 1:2}); return set + '' === "length";
}
ยงArray.of
?
function(){
// Array.from -> Set -> [[Set]] var set = []; var p = new Proxy({}, { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); Array.of.call(function(){ return p; }, 1, 2, 3); return set + '' === "length";
}
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Error
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function(){
// Array.from -> Set -> [[Set]] var set = []; var p = new Proxy({}, { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); Array.of.call(function(){ return p; }, 1, 2, 3); return set + '' === "length";
}
ยงArray.prototype.copyWithin
?
function(){
// Array.prototype.copyWithin -> Set -> [[Set]] var set = []; var p = new Proxy([1,2,3,4,5,6], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.copyWithin(0, 3); return set + '' === "0,1,2";
}
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Error
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function(){
// Array.prototype.copyWithin -> Set -> [[Set]] var set = []; var p = new Proxy([1,2,3,4,5,6], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.copyWithin(0, 3); return set + '' === "0,1,2";
}
ยงArray.prototype.fill
?
function(){
// Array.prototype.fill -> Set -> [[Set]] var set = []; var p = new Proxy([1,2,3,4,5,6], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.fill(0, 3); return set + '' === "3,4,5";
}
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Error
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function(){
// Array.prototype.fill -> Set -> [[Set]] var set = []; var p = new Proxy([1,2,3,4,5,6], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.fill(0, 3); return set + '' === "3,4,5";
}
ยงArray.prototype.pop
?
function(){
// Array.prototype.pop -> Set -> [[Set]] var set = []; var p = new Proxy([], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.pop(); return set + '' === "length";
}
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Error
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function(){
// Array.prototype.pop -> Set -> [[Set]] var set = []; var p = new Proxy([], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.pop(); return set + '' === "length";
}
ยงArray.prototype.push
?
function(){
// Array.prototype.push -> Set -> [[Set]] var set = []; var p = new Proxy([], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.push(0,0,0); return set + '' === "0,1,2,length";
}
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function(){
// Array.prototype.push -> Set -> [[Set]] var set = []; var p = new Proxy([], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.push(0,0,0); return set + '' === "0,1,2,length";
}
ยงArray.prototype.reverse
?
function(){
// Array.prototype.reverse -> Set -> [[Set]] var set = []; var p = new Proxy([0,0,0,,], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.reverse(); return set + '' === "3,1,2";
}
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function(){
// Array.prototype.reverse -> Set -> [[Set]] var set = []; var p = new Proxy([0,0,0,,], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.reverse(); return set + '' === "3,1,2";
}
ยงArray.prototype.shift
?
function(){
// Array.prototype.shift -> Set -> [[Set]] var set = []; var p = new Proxy([0,0,,0], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.shift(); return set + '' === "0,2,length";
}
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function(){
// Array.prototype.shift -> Set -> [[Set]] var set = []; var p = new Proxy([0,0,,0], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.shift(); return set + '' === "0,2,length";
}
ยงArray.prototype.splice
?
function(){
// Array.prototype.splice -> Set -> [[Set]] var set = []; var p = new Proxy([1,2,3], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.splice(1,0,0); return set + '' === "3,2,1,length";
}
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function(){
// Array.prototype.splice -> Set -> [[Set]] var set = []; var p = new Proxy([1,2,3], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.splice(1,0,0); return set + '' === "3,2,1,length";
}
ยงArray.prototype.unshift
?
function(){
// Array.prototype.unshift -> Set -> [[Set]] var set = []; var p = new Proxy([0,0,,0], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.unshift(0,1); return set + '' === "5,3,2,0,1,length";
}
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function(){
// Array.prototype.unshift -> Set -> [[Set]] var set = []; var p = new Proxy([0,0,,0], { set: function(o, k, v) { set.push(k); o[k] = v; return true; }}); p.unshift(0,1); return set + '' === "5,3,2,0,1,length";
}

Proxy, internal 'defineProperty' calls

ยง[[Set]]
?
function(){
// [[Set]] -> [[DefineOwnProperty]] var def = []; var p = new Proxy({foo:1, bar:2}, { defineProperty: function(o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; }}); p.foo = 2; p.bar = 4; return def + '' === "foo,bar";
}
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Error
Error
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function(){
// [[Set]] -> [[DefineOwnProperty]] var def = []; var p = new Proxy({foo:1, bar:2}, { defineProperty: function(o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; }}); p.foo = 2; p.bar = 4; return def + '' === "foo,bar";
}
ยงSetIntegrityLevel
?
function(){
// SetIntegrityLevel -> DefinePropertyOrThrow -> [[DefineOwnProperty]] var def = []; var p = new Proxy({foo:1, bar:2}, { defineProperty: function(o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; }}); Object.freeze(p); return def + '' === "foo,bar";
}
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Error
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function(){
// SetIntegrityLevel -> DefinePropertyOrThrow -> [[DefineOwnProperty]] var def = []; var p = new Proxy({foo:1, bar:2}, { defineProperty: function(o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; }}); Object.freeze(p); return def + '' === "foo,bar";
}

Proxy, internal 'deleteProperty' calls

ยงArray.prototype.copyWithin
?
function(){
// Array.prototype.copyWithin -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,0,,,,], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.copyWithin(0,3); return del + '' === "0,1,2";
}
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function(){
// Array.prototype.copyWithin -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,0,,,,], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.copyWithin(0,3); return del + '' === "0,1,2";
}
ยงArray.prototype.pop
?
function(){
// Array.prototype.pop -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.pop(); return del + '' === "2";
}
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function(){
// Array.prototype.pop -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.pop(); return del + '' === "2";
}
ยงArray.prototype.reverse
?
function(){
// Array.prototype.reverse -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,,2,,4,,], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.reverse(); return del + '' === "0,4,2";
}
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function(){
// Array.prototype.reverse -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,,2,,4,,], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.reverse(); return del + '' === "0,4,2";
}
ยงArray.prototype.shift
?
function(){
// Array.prototype.shift -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,,0,,0,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.shift(); return del + '' === "0,2,5";
}
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function(){
// Array.prototype.shift -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,,0,,0,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.shift(); return del + '' === "0,2,5";
}
ยงArray.prototype.splice
?
function(){
// Array.prototype.splice -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,0,0,,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.splice(2,2,0); return del + '' === "3,5";
}
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function(){
// Array.prototype.splice -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,0,0,,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.splice(2,2,0); return del + '' === "3,5";
}
ยงArray.prototype.unshift
?
function(){
// Array.prototype.unshift -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,,0,,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.unshift(0); return del + '' === "5,3";
}
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function(){
// Array.prototype.unshift -> DeletePropertyOrThrow -> [[Delete]] var del = []; var p = new Proxy([0,0,,0,,0], { deleteProperty: function(o, v) { del.push(v); return delete o[v]; }}); p.unshift(0); return del + '' === "5,3";
}

Proxy, internal 'getOwnPropertyDescriptor' calls

ยง[[Set]]
?
function(){
// [[Set]] -> [[GetOwnProperty]] var gopd = []; var p = new Proxy({}, { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); p.foo = 1; p.bar = 1; return gopd + '' === "foo,bar";
}
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function(){
// [[Set]] -> [[GetOwnProperty]] var gopd = []; var p = new Proxy({}, { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); p.foo = 1; p.bar = 1; return gopd + '' === "foo,bar";
}
ยงObject.assign
?
function(){
// Object.assign -> [[GetOwnProperty]] var gopd = []; var p = new Proxy({foo:1, bar:2}, { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); Object.assign({}, p); return gopd + '' === "foo,bar";
}
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function(){
// Object.assign -> [[GetOwnProperty]] var gopd = []; var p = new Proxy({foo:1, bar:2}, { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); Object.assign({}, p); return gopd + '' === "foo,bar";
}
ยงObject.prototype.hasOwnProperty
?
function(){
// Object.prototype.hasOwnProperty -> HasOwnProperty -> [[GetOwnProperty]] var gopd = []; var p = new Proxy({foo:1, bar:2}, { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); p.hasOwnProperty('garply'); return gopd + '' === "garply";
}
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function(){
// Object.prototype.hasOwnProperty -> HasOwnProperty -> [[GetOwnProperty]] var gopd = []; var p = new Proxy({foo:1, bar:2}, { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); p.hasOwnProperty('garply'); return gopd + '' === "garply";
}
ยงFunction.prototype.bind
?
function(){
// Function.prototype.bind -> HasOwnProperty -> [[GetOwnProperty]] var gopd = []; var p = new Proxy(Function(), { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); p.bind(); return gopd + '' === "length";
}
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function(){
// Function.prototype.bind -> HasOwnProperty -> [[GetOwnProperty]] var gopd = []; var p = new Proxy(Function(), { getOwnPropertyDescriptor: function(o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); }}); p.bind(); return gopd + '' === "length";
}

Proxy, internal 'ownKeys' calls

ยงSetIntegrityLevel
?
function(){
// SetIntegrityLevel -> [[OwnPropertyKeys]] var ownKeysCalled = 0; var p = new Proxy({}, { ownKeys: function(o) { ownKeysCalled++; return Object.keys(o); }}); Object.freeze(p); return ownKeysCalled === 1;
}
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function(){
// SetIntegrityLevel -> [[OwnPropertyKeys]] var ownKeysCalled = 0; var p = new Proxy({}, { ownKeys: function(o) { ownKeysCalled++; return Object.keys(o); }}); Object.freeze(p); return ownKeysCalled === 1;
}
ยงTestIntegrityLevel
?
function(){
// TestIntegrityLevel -> [[OwnPropertyKeys]] var ownKeysCalled = 0; var p = new Proxy(Object.preventExtensions({}), { ownKeys: function(o) { ownKeysCalled++; return Object.keys(o); }}); Object.isFrozen(p); return ownKeysCalled === 1;
}
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function(){
// TestIntegrityLevel -> [[OwnPropertyKeys]] var ownKeysCalled = 0; var p = new Proxy(Object.preventExtensions({}), { ownKeys: function(o) { ownKeysCalled++; return Object.keys(o); }}); Object.isFrozen(p); return ownKeysCalled === 1;
}
ยงSerializeJSONObject
?
function(){
// SerializeJSONObject -> EnumerableOwnNames -> [[OwnPropertyKeys]] var ownKeysCalled = 0; var p = new Proxy({}, { ownKeys: function(o) { ownKeysCalled++; return Object.keys(o); }}); JSON.stringify({a:p,b:p}); return ownKeysCalled === 2;
}
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function(){
// SerializeJSONObject -> EnumerableOwnNames -> [[OwnPropertyKeys]] var ownKeysCalled = 0; var p = new Proxy({}, { ownKeys: function(o) { ownKeysCalled++; return Object.keys(o); }}); JSON.stringify({a:p,b:p}); return ownKeysCalled === 2;
}

Object static methods accept primitives

ยงObject.getPrototypeOf
?
function(){
return Object.getPrototypeOf('a').constructor === String;
}
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function(){
return Object.getPrototypeOf('a').constructor === String;
}
ยงObject.getOwnPropertyDescriptor
?
function(){
return Object.getOwnPropertyDescriptor('a', 'foo') === void undefined;
}
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Error
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function(){
return Object.getOwnPropertyDescriptor('a', 'foo') === void undefined;
}
ยงObject.getOwnPropertyNames
?
function(){
var s = Object.getOwnPropertyNames('a'); return s.length === 2 && ((s[0] === 'length' && s[1] === '0') || (s[0] === '0' && s[1] === 'length'));
}
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function(){
var s = Object.getOwnPropertyNames('a'); return s.length === 2 && ((s[0] === 'length' && s[1] === '0') || (s[0] === '0' && s[1] === 'length'));
}
ยงObject.seal
?
function(){
return Object.seal('a') === 'a';
}
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Error
Error
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function(){
return Object.seal('a') === 'a';
}
ยงObject.freeze
?
function(){
return Object.freeze('a') === 'a';
}
Yes
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Error
Error
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Error
function(){
return Object.freeze('a') === 'a';
}
ยงObject.preventExtensions
?
function(){
return Object.preventExtensions('a') === 'a';
}
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Error
function(){
return Object.preventExtensions('a') === 'a';
}
ยงObject.isSealed
?
function(){
return Object.isSealed('a') === true;
}
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Error
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Error
function(){
return Object.isSealed('a') === true;
}
ยงObject.isFrozen
?
function(){
return Object.isFrozen('a') === true;
}
Yes
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Error
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Error
function(){
return Object.isFrozen('a') === true;
}
ยงObject.isExtensible
?
function(){
return Object.isExtensible('a') === false;
}
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Error
Error
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Error
function(){
return Object.isExtensible('a') === false;
}
ยงObject.keys
?
function(){
var s = Object.keys('a'); return s.length === 1 && s[0] === '0';
}
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function(){
var s = Object.keys('a'); return s.length === 1 && s[0] === '0';
}

own property order

ยงObject.keys
?
function(){
var obj = { // Non-negative integer names appear first in value order 2: true, 0: true, 1: true, // Other string names appear in source order ' ': true, // Non-negative integers are sorted above other names 9: true, D: true, B: true, // Negative integers are treated as other names '-1': true }; // Other string names are added in order of creation obj.A = true; // Non-negative integer names, conversely, ignore order of creation obj[3] = true; // Having a total of 20+ properties doesn't affect property order "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); // Object.defineProperty doesn't affect the above rules Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); // Deleting and reinserting a property doesn't preserve its position delete obj[2]; obj[2] = true; var forInOrder = ''; for(var key in obj)forInOrder += key; return Object.keys(obj).join('') === forInOrder;
}
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function(){
var obj = { // Non-negative integer names appear first in value order 2: true, 0: true, 1: true, // Other string names appear in source order ' ': true, // Non-negative integers are sorted above other names 9: true, D: true, B: true, // Negative integers are treated as other names '-1': true }; // Other string names are added in order of creation obj.A = true; // Non-negative integer names, conversely, ignore order of creation obj[3] = true; // Having a total of 20+ properties doesn't affect property order "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); // Object.defineProperty doesn't affect the above rules Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); // Deleting and reinserting a property doesn't preserve its position delete obj[2]; obj[2] = true; var forInOrder = ''; for(var key in obj)forInOrder += key; return Object.keys(obj).join('') === forInOrder;
}
ยงObject.getOwnPropertyNames
?
function(){
var obj = { 2: true, 0: true, 1: true, ' ': true, 9: true, D: true, B: true, '-1': true }; obj.A = true; obj[3] = true; "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); delete obj[2]; obj[2] = true; return Object.getOwnPropertyNames(obj).join('') === "012349 DB-1AEFGHIJKLMNOPQRSTUVWXYZC";
}
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function(){
var obj = { 2: true, 0: true, 1: true, ' ': true, 9: true, D: true, B: true, '-1': true }; obj.A = true; obj[3] = true; "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); delete obj[2]; obj[2] = true; return Object.getOwnPropertyNames(obj).join('') === "012349 DB-1AEFGHIJKLMNOPQRSTUVWXYZC";
}
ยงObject.assign
?
function(){
var result = ''; var target = {}; "012349 DBACEFGHIJKLMNOPQRST".split('').concat(-1).forEach(function(key){ Object.defineProperty(target, key, { set: function(){ result += key; } }) }); var obj = {2: 2, 0: 0, 1: 1, ' ': ' ', 9: 9, D: 'D', B: 'B', '-1': '-1'}; Object.defineProperty(obj, 'A', {value: 'A', enumerable: true}); Object.defineProperty(obj, '3', {value: '3', enumerable: true}); Object.defineProperty(obj, 'C', {value: 'C', enumerable: true}); Object.defineProperty(obj, '4', {value: '4', enumerable: true}); delete obj[2]; obj[2] = true; "EFGHIJKLMNOPQRST".split('').forEach(function(key){ obj[key] = key; }); Object.assign(target, obj); return result === "012349 DB-1ACEFGHIJKLMNOPQRST";
}
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function(){
var result = ''; var target = {}; "012349 DBACEFGHIJKLMNOPQRST".split('').concat(-1).forEach(function(key){ Object.defineProperty(target, key, { set: function(){ result += key; } }) }); var obj = {2: 2, 0: 0, 1: 1, ' ': ' ', 9: 9, D: 'D', B: 'B', '-1': '-1'}; Object.defineProperty(obj, 'A', {value: 'A', enumerable: true}); Object.defineProperty(obj, '3', {value: '3', enumerable: true}); Object.defineProperty(obj, 'C', {value: 'C', enumerable: true}); Object.defineProperty(obj, '4', {value: '4', enumerable: true}); delete obj[2]; obj[2] = true; "EFGHIJKLMNOPQRST".split('').forEach(function(key){ obj[key] = key; }); Object.assign(target, obj); return result === "012349 DB-1ACEFGHIJKLMNOPQRST";
}
ยงJSON.stringify
?
function(){
var obj = { 2: true, 0: true, 1: true, ' ': true, 9: true, D: true, B: true, '-1': true }; obj.A = true; obj[3] = true; "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); delete obj[2]; obj[2] = true; return JSON.stringify(obj) === '{"0":true,"1":true,"2":true,"3":true,"4":true,"9":true," ":true,"D":true,"B":true,"-1":true,"A":true,"E":true,"F":true,"G":true,"H":true,"I":true,"J":true,"K":true,"L":true,"M":true,"N":true,"O":true,"P":true,"Q":true,"R":true,"S":true,"T":true,"U":true,"V":true,"W":true,"X":true,"Y":true,"Z":true,"C":true}';
}
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function(){
var obj = { 2: true, 0: true, 1: true, ' ': true, 9: true, D: true, B: true, '-1': true }; obj.A = true; obj[3] = true; "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); delete obj[2]; obj[2] = true; return JSON.stringify(obj) === '{"0":true,"1":true,"2":true,"3":true,"4":true,"9":true," ":true,"D":true,"B":true,"-1":true,"A":true,"E":true,"F":true,"G":true,"H":true,"I":true,"J":true,"K":true,"L":true,"M":true,"N":true,"O":true,"P":true,"Q":true,"R":true,"S":true,"T":true,"U":true,"V":true,"W":true,"X":true,"Y":true,"Z":true,"C":true}';
}
ยงJSON.parse
?
function(){
var result = ''; JSON.parse( '{"0":true,"1":true,"2":true,"3":true,"4":true,"9":true," ":true,"D":true,"B":true,"-1":true,"E":true,"F":true,"G":true,"H":true,"I":true,"J":true,"K":true,"L":true,"A":true,"C":true}', function reviver(k,v) { result += k; return v; } ); return result === "012349 DB-1EFGHIJKLAC";
}
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function(){
var result = ''; JSON.parse( '{"0":true,"1":true,"2":true,"3":true,"4":true,"9":true," ":true,"D":true,"B":true,"-1":true,"E":true,"F":true,"G":true,"H":true,"I":true,"J":true,"K":true,"L":true,"A":true,"C":true}', function reviver(k,v) { result += k; return v; } ); return result === "012349 DB-1EFGHIJKLAC";
}
ยงReflect.ownKeys, string key order
?
function(){
var obj = { 2: true, 0: true, 1: true, ' ': true, 9: true, D: true, B: true, '-1': true }; obj.A = true; obj[3] = true; "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); delete obj[2]; obj[2] = true; return Reflect.ownKeys(obj).join('') === "012349 DB-1AEFGHIJKLMNOPQRSTUVWXYZC";
}
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Error
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function(){
var obj = { 2: true, 0: true, 1: true, ' ': true, 9: true, D: true, B: true, '-1': true }; obj.A = true; obj[3] = true; "EFGHIJKLMNOPQRSTUVWXYZ".split('').forEach(function(key){ obj[key] = true; }); Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, '4', { value: true, enumerable: true }); delete obj[2]; obj[2] = true; return Reflect.ownKeys(obj).join('') === "012349 DB-1AEFGHIJKLMNOPQRSTUVWXYZC";
}
ยงReflect.ownKeys, symbol key order
?
function(){
var sym1 = Symbol(), sym2 = Symbol(), sym3 = Symbol(); var obj = { 1: true, A: true }; obj.B = true; obj[sym1] = true; obj[2] = true; obj[sym2] = true; Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, sym3,{ value: true, enumerable: true }); Object.defineProperty(obj, 'D', { value: true, enumerable: true }); var result = Reflect.ownKeys(obj); var l = result.length; return result[l-3] === sym1 && result[l-2] === sym2 && result[l-1] === sym3;
}
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Error
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function(){
var sym1 = Symbol(), sym2 = Symbol(), sym3 = Symbol(); var obj = { 1: true, A: true }; obj.B = true; obj[sym1] = true; obj[2] = true; obj[sym2] = true; Object.defineProperty(obj, 'C', { value: true, enumerable: true }); Object.defineProperty(obj, sym3,{ value: true, enumerable: true }); Object.defineProperty(obj, 'D', { value: true, enumerable: true }); var result = Reflect.ownKeys(obj); var l = result.length; return result[l-3] === sym1 && result[l-2] === sym2 && result[l-1] === sym3;
}

Updated identifier syntax

ยงvar โธฏ;
?
function(){
try { eval('var โธฏ'); } catch(e) { return true; }
}
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Yes
No
No
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No
function(){
try { eval('var โธฏ'); } catch(e) { return true; }
}
ยงvar ๐‹€;
?
function(){
var ๐‹€; return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
var ๐‹€; return true;
}
ยงno escaped reserved words as identifiers
?
function(){
var \u0061; try { eval('var v\\u0061r'); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
No
No
No
No
No
No
No
No
function(){
var \u0061; try { eval('var v\\u0061r'); } catch(e) { return true; }
}

miscellaneous

ยงduplicate property names in strict mode
?
function(){
'use strict'; return this === void undefined && ({ a:1, a:1 }).a === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
'use strict'; return this === void undefined && ({ a:1, a:1 }).a === 1;
}
ยงno semicolon needed after do-while
?
function(){
do {} while (false) return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
do {} while (false) return true;
}
ยงno assignments allowed in for-in head in strict mode
?
function(){
'use strict'; try { eval('for (var i = 0 in {}) {}'); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
'use strict'; try { eval('for (var i = 0 in {}) {}'); } catch(e) { return true; }
}
ยงaccessors aren't constructors
?
function(){
var f = (Object.getOwnPropertyDescriptor({get a(){}}, 'a')).get; try { new f; } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
No
No
No
No
function(){
var f = (Object.getOwnPropertyDescriptor({get a(){}}, 'a')).get; try { new f; } catch(e) { return true; }
}
ยงInvalid Date
?
function(){
return new Date(NaN) + "" === "Invalid Date";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return new Date(NaN) + "" === "Invalid Date";
}
ยงRegExp constructor can alter flags
?
function(){
return new RegExp(/./im, "g").global === true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return new RegExp(/./im, "g").global === true;
}
ยงRegExp.prototype.toString generic and uses "flags" property
?
function(){
return RegExp.prototype.toString.call({source: 'foo', flags: 'bar'}) === '/foo/bar';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return RegExp.prototype.toString.call({source: 'foo', flags: 'bar'}) === '/foo/bar';
}
ยงbuilt-in prototypes are not instances
?
function(){
try { RegExp.prototype.exec(); return false; } catch(e) {} try { Date.prototype.valueOf(); return false; } catch(e) {} if (![Error, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, URIError].every(function (E) { return Object.prototype.toString.call(E.prototype) === '[object Object]'; })) { return false; } return true;
}
Yes
Yes
Yes
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No
No
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No
No
No
function(){
try { RegExp.prototype.exec(); return false; } catch(e) {} try { Date.prototype.valueOf(); return false; } catch(e) {} if (![Error, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, URIError].every(function (E) { return Object.prototype.toString.call(E.prototype) === '[object Object]'; })) { return false; } return true;
}
ยงfunction 'length' is configurable
?
function(){
var fn = function(a, b) {}; var desc = Object.getOwnPropertyDescriptor(fn, "length"); if (desc.configurable) { Object.defineProperty(fn, "length", { value: 1 }); return fn.length === 1; } return false;
}
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
var fn = function(a, b) {}; var desc = Object.getOwnPropertyDescriptor(fn, "length"); if (desc.configurable) { Object.defineProperty(fn, "length", { value: 1 }); return fn.length === 1; } return false;
}

annex b

non-strict function semantics

ยงhoisted block-level function declaration
?
function(){
// Note: only available outside of strict mode. if (!this) return false; var passed = f() === 1; function f() { return 1; } passed &= typeof g === 'undefined'; { function g() { return 1; } } passed &= g() === 1; passed &= h() === 2; { function h() { return 1; } } function h() { return 2; } passed &= h() === 1; return passed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
function(){
// Note: only available outside of strict mode. if (!this) return false; var passed = f() === 1; function f() { return 1; } passed &= typeof g === 'undefined'; { function g() { return 1; } } passed &= g() === 1; passed &= h() === 2; { function h() { return 1; } } function h() { return 2; } passed &= h() === 1; return passed;
}
ยงlabeled function statements
?
function(){
// Note: only available outside of strict mode. if (!this) return false; label: function foo() { return 2; } return foo() === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
function(){
// Note: only available outside of strict mode. if (!this) return false; label: function foo() { return 2; } return foo() === 2;
}
ยงfunction statements in if-statement clauses
?
function(){
// Note: only available outside of strict mode. if (!this) return false; if(true) function foo() { return 2; } if(false) {} else function bar() { return 3; } if(true) function baz() { return 4; } else {} if(false) function qux() { return 5; } else function qux() { return 6; } return foo() === 2 && bar() === 3 && baz() === 4 && qux() === 6;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
function(){
// Note: only available outside of strict mode. if (!this) return false; if(true) function foo() { return 2; } if(false) {} else function bar() { return 3; } if(true) function baz() { return 4; } else {} if(false) function qux() { return 5; } else function qux() { return 6; } return foo() === 2 && bar() === 3 && baz() === 4 && qux() === 6;
}

__proto__ in object literals

ยงbasic support
?
function(){
return { __proto__ : [] } instanceof Array && !({ __proto__ : null } instanceof Object);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
function(){
return { __proto__ : [] } instanceof Array && !({ __proto__ : null } instanceof Object);
}
ยงmultiple __proto__ is an error
?
function(){
try { eval("({ __proto__ : [], __proto__: {} })"); } catch(e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
function(){
try { eval("({ __proto__ : [], __proto__: {} })"); } catch(e) { return true; }
}
ยงnot a computed property
?
function(){
if (!({ __proto__ : [] } instanceof Array)) { return false; } var a = "__proto__"; return !({ [a] : [] } instanceof Array);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
function(){
if (!({ __proto__ : [] } instanceof Array)) { return false; } var a = "__proto__"; return !({ [a] : [] } instanceof Array);
}
ยงnot a shorthand property
?
function(){
if (!({ __proto__ : [] } instanceof Array)) { return false; } var __proto__ = []; return !({ __proto__ } instanceof Array);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Error
Error
Error
Error
function(){
if (!({ __proto__ : [] } instanceof Array)) { return false; } var __proto__ = []; return !({ __proto__ } instanceof Array);
}
ยงnot a shorthand method
?
function(){
if (!({ __proto__ : [] } instanceof Array)) { return false; } return !({ __proto__(){} } instanceof Function);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Error
Error
Error
Error
function(){
if (!({ __proto__ : [] } instanceof Array)) { return false; } return !({ __proto__(){} } instanceof Function);
}

Object.prototype.__proto__

ยงget prototype
?
function(){
var A = function(){}; return (new A()).__proto__ === A.prototype;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var A = function(){}; return (new A()).__proto__ === A.prototype;
}
ยงset prototype
?
function(){
var o = {}; o.__proto__ = Array.prototype; return o instanceof Array;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var o = {}; o.__proto__ = Array.prototype; return o instanceof Array;
}
ยงabsent from Object.create(null)
?
function(){
var o = Object.create(null), p = {}; o.__proto__ = p; return Object.getPrototypeOf(o) !== p;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
var o = Object.create(null), p = {}; o.__proto__ = p; return Object.getPrototypeOf(o) !== p;
}
ยงpresent in hasOwnProperty()
?
function(){
return Object.prototype.hasOwnProperty('__proto__');
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return Object.prototype.hasOwnProperty('__proto__');
}
ยงcorrect property descriptor
?
function(){
var desc = Object.getOwnPropertyDescriptor(Object.prototype,"__proto__"); var A = function(){}; return (desc && "get" in desc && "set" in desc && desc.configurable && !desc.enumerable);
}
Yes
Yes
Yes
Yes
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Yes
Yes
No
No
function(){
var desc = Object.getOwnPropertyDescriptor(Object.prototype,"__proto__"); var A = function(){}; return (desc && "get" in desc && "set" in desc && desc.configurable && !desc.enumerable);
}
ยงpresent in Object.getOwnPropertyNames()
?
function(){
return Object.getOwnPropertyNames(Object.prototype).indexOf('__proto__') > -1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
function(){
return Object.getOwnPropertyNames(Object.prototype).indexOf('__proto__') > -1;
}

String.prototype HTML methods

ยงexistence
?
function(){
var i, names = ["anchor", "big", "bold", "fixed", "fontcolor", "fontsize", "italics", "link", "small", "strike", "sub", "sup"]; for (i = 0; i < names.length; i++) { if (typeof String.prototype[names[i]] !== 'function') { return false; } } return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
function(){
var i, names = ["anchor", "big", "bold", "fixed", "fontcolor", "fontsize", "italics", "link", "small", "strike", "sub", "sup"]; for (i = 0; i < names.length; i++) { if (typeof String.prototype[names[i]] !== 'function') { return false; } } return true;
}
ยงtags' names are lowercase
?
function(){
var i, names = ["anchor", "big", "bold", "fixed", "fontcolor", "fontsize", "italics", "link", "small", "strike", "sub", "sup"]; for (i = 0; i < names.length; i++) { if (""[names[i]]().toLowerCase() !== ""[names[i]]()) { return false; } } return true;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
function(){
var i, names = ["anchor", "big", "bold", "fixed", "fontcolor", "fontsize", "italics", "link", "small", "strike", "sub", "sup"]; for (i = 0; i < names.length; i++) { if (""[names[i]]().toLowerCase() !== ""[names[i]]()) { return false; } } return true;
}
ยงquotes in arguments are escaped
?
function(){
var i, names = ["anchor", "fontcolor", "fontsize", "link"]; for (i = 0; i < names.length; i++) { if (""[names[i]]('"') !== ""[names[i]]('&' + 'quot;')) { return false; } } return true;
}
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
function(){
var i, names = ["anchor", "fontcolor", "fontsize", "link"]; for (i = 0; i < names.length; i++) { if (""[names[i]]('"') !== ""[names[i]]('&' + 'quot;')) { return false; } } return true;
}

RegExp.prototype.compile

ยงbasic functionality
?
function(){
if (typeof RegExp.prototype.compile !== 'function') return false var rx = /a/; rx.compile('b'); return rx.test('b');
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
if (typeof RegExp.prototype.compile !== 'function') return false var rx = /a/; rx.compile('b'); return rx.test('b');
}
ยงreturns this
?
function(){
var rx = /a/; return rx.compile('b') === rx;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
var rx = /a/; return rx.compile('b') === rx;
}

RegExp syntax extensions

ยงhyphens in character sets
?
function(){
return /[\w-_]/.exec("-")[0] === "-";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return /[\w-_]/.exec("-")[0] === "-";
}
ยงinvalid character escapes
?
function(){
return /\z/.exec("\\z")[0] === "z" && /[\z]/.exec("[\\z]")[0] === "z";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return /\z/.exec("\\z")[0] === "z" && /[\z]/.exec("[\\z]")[0] === "z";
}
ยงinvalid control-character escapes
?
function(){
return /\c2/.exec("\\c2")[0] === "\\c2";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return /\c2/.exec("\\c2")[0] === "\\c2";
}
ยงinvalid Unicode escapes
?
function(){
return /\u1/.exec("u1")[0] === "u1" && /[\u1]/.exec("u")[0] === "u";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return /\u1/.exec("u1")[0] === "u1" && /[\u1]/.exec("u")[0] === "u";
}
ยงinvalid hexadecimal escapes
?
function(){
return /\x1/.exec("x1")[0] === "x1" && /[\x1]/.exec("x")[0] === "x";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return /\x1/.exec("x1")[0] === "x1" && /[\x1]/.exec("x")[0] === "x";
}
ยงincomplete patterns and quantifiers
?
function(){
return /x{1/.exec("x{1")[0] === "x{1" && /x]1/.exec("x]1")[0] === "x]1";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
function(){
return /x{1/.exec("x{1")[0] === "x{1" && /x]1/.exec("x]1")[0] === "x]1";
}
ยงoctal escape sequences
?
function(){
return /\041/.exec("!")[0] === "!" && /[\041]/.exec("!")[0] === "!";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
function(){
return /\041/.exec("!")[0] === "!" && /[\041]/.exec("!")[0] === "!";
}
ยงinvalid backreferences become octal escapes
?
function(){
return /\41/.exec("!")[0] === "!" && /[\41]/.exec("!")[0] === "!";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
function(){
return /\41/.exec("!")[0] === "!" && /[\41]/.exec("!")[0] === "!";
}

ยงHTML-style comments
?
function(){
--> A comment <!-- Another comment var a = 3; <!-- Another comment return a === 3;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
function(){
--> A comment <!-- Another comment var a = 3; <!-- Another comment return a === 3;
}

Node.js ES2016 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
100% complete100% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
100% complete100% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
100% complete100% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
100% complete100% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
100% complete100% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
100% complete100% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
100% complete100% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
100% complete100% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
100% complete100% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
100% complete100% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
100% complete100% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
100% complete100% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
100% complete100% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
100% complete100% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
100% complete100% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
100% complete100% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
100% complete100% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
100% complete100% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
100% complete100% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
100% complete100% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
100% complete100% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
100% complete100% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
100% complete100% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
100% complete100% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
100% complete100% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
100% complete100% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
100% complete100% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
100% complete100% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
100% complete100% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
100% complete100% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
100% complete100% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
100% complete100% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
100% complete100% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
100% complete100% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
100% complete100% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
100% complete100% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
100% complete100% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
100% complete100% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
100% complete100% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
100% complete100% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
100% complete100% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
100% complete100% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
100% complete100% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
100% complete100% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
100% complete100% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
100% complete100% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
100% complete100% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
100% complete100% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
100% complete100% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
100% complete78% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
78% complete78% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
35% complete7% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
7% complete7% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
7% complete0% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
0% complete0% complete

features

exponentiation (**) operator

ยงbasic support
?
function(){
return 2 ** 3 === 8 && -(5 ** 2) === -25 && (-5) ** 2 === 25;
}
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Error
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function(){
return 2 ** 3 === 8 && -(5 ** 2) === -25 && (-5) ** 2 === 25;
}
ยงassignment
?
function(){
var a = 2; a **= 3; return a === 8;
}
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Error
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function(){
var a = 2; a **= 3; return a === 8;
}
ยงearly syntax error for unary negation without parens
?
function(){
if (2 ** 3 !== 8) { return false; } try { Function("-5 ** 2")(); } catch (e) { return true; }
}
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Error
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function(){
if (2 ** 3 !== 8) { return false; } try { Function("-5 ** 2")(); } catch (e) { return true; }
}

Array.prototype.includes

ยงArray.prototype.includes
?
function(){
return [1, 2, 3].includes(1) && ![1, 2, 3].includes(4) && ![1, 2, 3].includes(1, 1) && [NaN].includes(NaN);
}
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function(){
return [1, 2, 3].includes(1) && ![1, 2, 3].includes(4) && ![1, 2, 3].includes(1, 1) && [NaN].includes(NaN);
}
ยงArray.prototype.includes handles sparse arrays
?
function(){
return [,].includes() && Array(1).includes();
}
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Error
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function(){
return [,].includes() && Array(1).includes();
}
ยงArray.prototype.includes is generic
?
function(){
var passed = 0; return [].includes.call( { get "0"() { passed = NaN; return 'foo'; }, get "11"() { passed += 1; return 0; }, get "19"() { passed += 1; return 'foo'; }, get "21"() { passed = NaN; return 'foo'; }, get length() { passed += 1; return 24; } }, 'foo', 6 ) === true && passed === 3;
}
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function(){
var passed = 0; return [].includes.call( { get "0"() { passed = NaN; return 'foo'; }, get "11"() { passed += 1; return 0; }, get "19"() { passed += 1; return 'foo'; }, get "21"() { passed = NaN; return 'foo'; }, get length() { passed += 1; return 24; } }, 'foo', 6 ) === true && passed === 3;
}
ยง%TypedArray%.prototype.includes
?
function(){
return [ Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array ].every(function (TypedArray) { return new TypedArray([1, 2, 3]).includes(1) && !new TypedArray([1, 2, 3]).includes(4) && !new TypedArray([1, 2, 3]).includes(1, 1); });
}
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function(){
return [ Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, Float32Array, Float64Array ].every(function (TypedArray) { return new TypedArray([1, 2, 3]).includes(1) && !new TypedArray([1, 2, 3]).includes(4) && !new TypedArray([1, 2, 3]).includes(1, 1); });
}

misc

ยงgenerator functions can't be used with "new"
?
function(){
function * generator() { yield 3; } try { new generator(); } catch (e) { return true; }
}
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function(){
function * generator() { yield 3; } try { new generator(); } catch (e) { return true; }
}
ยงgenerator throw() caught by inner generator
?
function(){
function * generator() { yield * (function * () { try { yield 'foo'; } catch (e) { return; } }()); yield 'bar'; } var iter = generator(); iter.next(); return iter['throw']().value === 'bar';
}
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Error
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function(){
function * generator() { yield * (function * () { try { yield 'foo'; } catch (e) { return; } }()); yield 'bar'; } var iter = generator(); iter.next(); return iter['throw']().value === 'bar';
}
ยงstrict fn w/ non-strict non-simple params is error
?
function(){
function foo(...a) {} try { Function("function bar(...a) {'use strict';}")(); } catch (e) { return true; }
}
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function(){
function foo(...a) {} try { Function("function bar(...a) {'use strict';}")(); } catch (e) { return true; }
}
ยงnested rest destructuring, declarations
?
function(){
var [x, ...[y, ...z]] = [1,2,3,4]; return x === 1 && y === 2 && z + '' === '3,4';
}
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Error
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function(){
var [x, ...[y, ...z]] = [1,2,3,4]; return x === 1 && y === 2 && z + '' === '3,4';
}
ยงnested rest destructuring, parameters
?
function(){
return function ([x, ...[y, ...z]]) { return x === 1 && y === 2 && z + '' === '3,4'; }([1,2,3,4]);
}
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Error
Error
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Error
function(){
return function ([x, ...[y, ...z]]) { return x === 1 && y === 2 && z + '' === '3,4'; }([1,2,3,4]);
}
ยงProxy, "enumerate" handler removed
?
function(){
var passed = true; var proxy = new Proxy({}, { enumerate: function () { passed = false; } }); for (var key in proxy); // Should not throw, nor execute the 'enumerate' method. return passed;
}
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Error
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Error
Error
Error
Error
function(){
var passed = true; var proxy = new Proxy({}, { enumerate: function () { passed = false; } }); for (var key in proxy); // Should not throw, nor execute the 'enumerate' method. return passed;
}
ยงProxy internal calls, Array.prototype.includes
?
function(){
// Array.prototype.includes -> Get -> [[Get]] var get = []; var p = new Proxy({length: 3, 0: '', 1: '', 2: '', 3: ''}, { get: function (o, k) { get.push(k); return o[k]; }}); Array.prototype.includes.call(p, {}); if (get + '' !== "length,0,1,2") return; get = []; p = new Proxy({length: 4, 0: NaN, 1: '', 2: NaN, 3: ''}, { get: function (o, k) { get.push(k); return o[k]; }}); Array.prototype.includes.call(p, NaN, 1); return (get + '' === "length,1,2");
}
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Array.prototype.includes -> Get -> [[Get]] var get = []; var p = new Proxy({length: 3, 0: '', 1: '', 2: '', 3: ''}, { get: function (o, k) { get.push(k); return o[k]; }}); Array.prototype.includes.call(p, {}); if (get + '' !== "length,0,1,2") return; get = []; p = new Proxy({length: 4, 0: NaN, 1: '', 2: NaN, 3: ''}, { get: function (o, k) { get.push(k); return o[k]; }}); Array.prototype.includes.call(p, NaN, 1); return (get + '' === "length,1,2");
}

Node.js ES2017 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
100% complete100% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
100% complete100% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
100% complete100% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
100% complete100% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
100% complete100% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
100% complete100% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
100% complete100% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
100% complete100% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
100% complete100% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
100% complete100% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
100% complete100% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
100% complete100% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
100% complete100% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
100% complete100% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
100% complete100% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
100% complete100% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
100% complete100% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
100% complete100% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
100% complete100% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
100% complete100% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
100% complete100% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
100% complete100% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
100% complete100% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
100% complete100% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
100% complete100% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
100% complete100% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
100% complete100% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
100% complete100% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
100% complete100% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
100% complete100% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
100% complete100% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
100% complete100% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
100% complete100% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
100% complete100% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
100% complete100% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
100% complete100% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
100% complete100% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
100% complete100% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
100% complete100% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
100% complete100% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
100% complete100% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
98% complete98% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
98% complete98% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
98% complete98% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
73% complete67% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
73% complete67% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
65% complete65% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
54% complete51% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
54% complete26% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
21% complete17% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
17% complete17% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
17% complete17% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
17% complete17% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
17% complete17% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
10% complete10% complete

features

Object static methods

ยงObject.values
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function(){
var obj = Object.create({ a: "qux", d: "qux" }); obj.a = "foo"; obj.b = "bar"; obj.c = "baz"; var v = Object.values(obj); return Array.isArray(v) && String(v) === "foo,bar,baz";
}
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function(){
var obj = Object.create({ a: "qux", d: "qux" }); obj.a = "foo"; obj.b = "bar"; obj.c = "baz"; var v = Object.values(obj); return Array.isArray(v) && String(v) === "foo,bar,baz";
}
ยงObject.entries
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function(){
var obj = Object.create({ a: "qux", d: "qux" }); obj.a = "foo"; obj.b = "bar"; obj.c = "baz"; var e = Object.entries(obj); return Array.isArray(e) && e.length === 3 && String(e[0]) === "a,foo" && String(e[1]) === "b,bar" && String(e[2]) === "c,baz";
}
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function(){
var obj = Object.create({ a: "qux", d: "qux" }); obj.a = "foo"; obj.b = "bar"; obj.c = "baz"; var e = Object.entries(obj); return Array.isArray(e) && e.length === 3 && String(e[0]) === "a,foo" && String(e[1]) === "b,bar" && String(e[2]) === "c,baz";
}
ยงObject.getOwnPropertyDescriptors
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function(){
var object = {a: 1}; var B = typeof Symbol === 'function' ? Symbol('b') : 'b'; object[B] = 2; var O = Object.defineProperty(object, 'c', {value: 3}); var D = Object.getOwnPropertyDescriptors(O); return D.a.value === 1 && D.a.enumerable === true && D.a.configurable === true && D.a.writable === true && D[B].value === 2 && D[B].enumerable === true && D[B].configurable === true && D[B].writable === true && D.c.value === 3 && D.c.enumerable === false && D.c.configurable === false && D.c.writable === false;
}
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function(){
var object = {a: 1}; var B = typeof Symbol === 'function' ? Symbol('b') : 'b'; object[B] = 2; var O = Object.defineProperty(object, 'c', {value: 3}); var D = Object.getOwnPropertyDescriptors(O); return D.a.value === 1 && D.a.enumerable === true && D.a.configurable === true && D.a.writable === true && D[B].value === 2 && D[B].enumerable === true && D[B].configurable === true && D[B].writable === true && D.c.value === 3 && D.c.enumerable === false && D.c.configurable === false && D.c.writable === false;
}
ยงObject.getOwnPropertyDescriptors doesn't provide undefined descriptors
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function(){
var P = new Proxy({ a: 1 }, { getOwnPropertyDescriptor: function (t, k) {} }); return !Object.getOwnPropertyDescriptors(P).hasOwnProperty('a');
}
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function(){
var P = new Proxy({ a: 1 }, { getOwnPropertyDescriptor: function (t, k) {} }); return !Object.getOwnPropertyDescriptors(P).hasOwnProperty('a');
}

String padding

ยงString.prototype.padStart
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function(){
return 'hello'.padStart(10) === ' hello' && 'hello'.padStart(10, '1234') === '12341hello' && 'hello'.padStart() === 'hello' && 'hello'.padStart(6, '123') === '1hello' && 'hello'.padStart(3) === 'hello' && 'hello'.padStart(3, '123') === 'hello';
}
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function(){
return 'hello'.padStart(10) === ' hello' && 'hello'.padStart(10, '1234') === '12341hello' && 'hello'.padStart() === 'hello' && 'hello'.padStart(6, '123') === '1hello' && 'hello'.padStart(3) === 'hello' && 'hello'.padStart(3, '123') === 'hello';
}
ยงString.prototype.padEnd
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function(){
return 'hello'.padEnd(10) === 'hello ' && 'hello'.padEnd(10, '1234') === 'hello12341' && 'hello'.padEnd() === 'hello' && 'hello'.padEnd(6, '123') === 'hello1' && 'hello'.padEnd(3) === 'hello' && 'hello'.padEnd(3, '123') === 'hello';
}
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function(){
return 'hello'.padEnd(10) === 'hello ' && 'hello'.padEnd(10, '1234') === 'hello12341' && 'hello'.padEnd() === 'hello' && 'hello'.padEnd(6, '123') === 'hello1' && 'hello'.padEnd(3) === 'hello' && 'hello'.padEnd(3, '123') === 'hello';
}

trailing commas in function syntax

ยงin parameter lists
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function(){
return typeof function f( a, b, ) {} === 'function';
}
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function(){
return typeof function f( a, b, ) {} === 'function';
}
ยงin argument lists
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function(){
return Math.min(1,2,3,) === 1;
}
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function(){
return Math.min(1,2,3,) === 1;
}

async functions

ยงreturn
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function(){
async function a() { return "foo"; } var p = a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
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function(){
async function a() { return "foo"; } var p = a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
ยงthrow
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function(){
async function a() { throw "foo"; } var p = a(); if (!(p instanceof Promise)) { return false; } p.catch (function (result) { if (result === "foo") { asyncTestPassed(); } });
}
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function(){
async function a() { throw "foo"; } var p = a(); if (!(p instanceof Promise)) { return false; } p.catch (function (result) { if (result === "foo") { asyncTestPassed(); } });
}
ยงno line break between async and function
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function(){
async function a() {} try { Function("async\n function a() {await 0}")(); } catch (e) { return true; }
}
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function(){
async function a() {} try { Function("async\n function a() {await 0}")(); } catch (e) { return true; }
}
ยงno "prototype" property
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function(){
async function a() {}; return !a.hasOwnProperty("prototype");
}
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function(){
async function a() {}; return !a.hasOwnProperty("prototype");
}
ยงawait
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function(){
(async function () { await Promise.resolve(); var a1 = await new Promise(function (resolve) { setTimeout(resolve,800,"foo"); }); var a2 = await new Promise(function (resolve) { setTimeout(resolve,800,"bar"); }); if (a1 + a2 === "foobar") { asyncTestPassed(); } }());
}
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function(){
(async function () { await Promise.resolve(); var a1 = await new Promise(function (resolve) { setTimeout(resolve,800,"foo"); }); var a2 = await new Promise(function (resolve) { setTimeout(resolve,800,"bar"); }); if (a1 + a2 === "foobar") { asyncTestPassed(); } }());
}
ยงawait, rejection
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function(){
(async function () { await Promise.resolve(); try { var a1 = await new Promise(function (_, reject) { setTimeout(reject,800,"foo"); }); } catch (e) { if (e === "foo") { asyncTestPassed(); } } }());
}
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function(){
(async function () { await Promise.resolve(); try { var a1 = await new Promise(function (_, reject) { setTimeout(reject,800,"foo"); }); } catch (e) { if (e === "foo") { asyncTestPassed(); } } }());
}
ยงmust await a value
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function(){
async function a() { await Promise.resolve(); } try { Function("(async function a() { await; }())")(); } catch (e) { return true; }
}
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Error
function(){
async function a() { await Promise.resolve(); } try { Function("(async function a() { await; }())")(); } catch (e) { return true; }
}
ยงcan await non-Promise values
?
function(){
(async function () { await Promise.resolve(); var e = await "foo"; if (e === "foo") { asyncTestPassed(); } }());
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
(async function () { await Promise.resolve(); var e = await "foo"; if (e === "foo") { asyncTestPassed(); } }());
}
ยงcannot await in parameters
?
function(){
async function a() { await Promise.resolve(); } try { Function("(async function a(b = await Promise.resolve()) {}())")(); } catch (e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
async function a() { await Promise.resolve(); } try { Function("(async function a(b = await Promise.resolve()) {}())")(); } catch (e) { return true; }
}
ยงasync methods, object literals
?
function(){
var o = { async a() { return await Promise.resolve("foo"); } }; var p = o.a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var o = { async a() { return await Promise.resolve("foo"); } }; var p = o.a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
ยงasync methods, classes
?
function(){
class C { async a() { return await Promise.resolve("foo"); } }; var p = new C().a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
class C { async a() { return await Promise.resolve("foo"); } }; var p = new C().a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
ยงasync arrow functions in methods, classes
?
function(){
function doSomething(callback) { callback(); } class C { a() { doSomething(async () => { await 1; asyncTestPassed(); }); } }; var p = new C().a();
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
function doSomething(callback) { callback(); } class C { a() { doSomething(async () => { await 1; asyncTestPassed(); }); } }; var p = new C().a();
}
ยงasync arrow functions
?
function(){
var a = async () => await Promise.resolve("foo"); var p = a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a = async () => await Promise.resolve("foo"); var p = a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
ยงcorrect prototype chain
?
function(){
var asyncFunctionProto = Object.getPrototypeOf(async function () {}); return asyncFunctionProto !== function () {}.prototype && Object.getPrototypeOf(asyncFunctionProto) === Function.prototype;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var asyncFunctionProto = Object.getPrototypeOf(async function () {}); return asyncFunctionProto !== function () {}.prototype && Object.getPrototypeOf(asyncFunctionProto) === Function.prototype;
}
ยงasync function prototype, Symbol.toStringTag
?
function(){
return Object.getPrototypeOf(async function () {})[Symbol.toStringTag] === "AsyncFunction";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return Object.getPrototypeOf(async function () {})[Symbol.toStringTag] === "AsyncFunction";
}
ยงasync function constructor
?
function(){
var a = async function () {}.constructor("return 'foo';"); var p = a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var a = async function () {}.constructor("return 'foo';"); var p = a(); if (!(p instanceof Promise)) { return false; } p.then(function (result) { if (result === "foo") { asyncTestPassed(); } });
}

shared memory and atomics

ยงSharedArrayBuffer
?
function(){
return typeof SharedArrayBuffer === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
return typeof SharedArrayBuffer === 'function';
}
ยงSharedArrayBuffer[Symbol.species]
?
function(){
return SharedArrayBuffer[Symbol.species] === SharedArrayBuffer;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return SharedArrayBuffer[Symbol.species] === SharedArrayBuffer;
}
ยงSharedArrayBuffer.prototype.byteLength
?
function(){
return 'byteLength' in SharedArrayBuffer.prototype;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return 'byteLength' in SharedArrayBuffer.prototype;
}
ยงSharedArrayBuffer.prototype.slice
?
function(){
return typeof SharedArrayBuffer.prototype.slice === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof SharedArrayBuffer.prototype.slice === 'function';
}
ยงSharedArrayBuffer.prototype[Symbol.toStringTag]
?
function(){
return SharedArrayBuffer.prototype[Symbol.toStringTag] === 'SharedArrayBuffer';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return SharedArrayBuffer.prototype[Symbol.toStringTag] === 'SharedArrayBuffer';
}
ยงAtomics.add
?
function(){
return typeof Atomics.add === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.add === 'function';
}
ยงAtomics.and
?
function(){
return typeof Atomics.and === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.and === 'function';
}
ยงAtomics.compareExchange
?
function(){
return typeof Atomics.compareExchange === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.compareExchange === 'function';
}
ยงAtomics.exchange
?
function(){
return typeof Atomics.exchange === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.exchange === 'function';
}
ยงAtomics.wait
?
function(){
return typeof Atomics.wait === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
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Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.wait === 'function';
}
ยงAtomics.notify
?
function(){
return typeof Atomics.notify === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.notify === 'function';
}
ยงAtomics.isLockFree
?
function(){
return typeof Atomics.isLockFree === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.isLockFree === 'function';
}
ยงAtomics.load
?
function(){
return typeof Atomics.load === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.load === 'function';
}
ยงAtomics.or
?
function(){
return typeof Atomics.or === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.or === 'function';
}
ยงAtomics.store
?
function(){
return typeof Atomics.store === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.store === 'function';
}
ยงAtomics.sub
?
function(){
return typeof Atomics.sub === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.sub === 'function';
}
ยงAtomics.xor
?
function(){
return typeof Atomics.xor === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return typeof Atomics.xor === 'function';
}

misc

ยงRegExp "u" flag, case folding
?
function(){
return "ลฟ".match(/\w/iu) && !"ลฟ".match(/\W/iu) && "\u212a".match(/\w/iu) && !"\u212a".match(/\W/iu) && "\u212a".match(/.\b/iu) && "ลฟ".match(/.\b/iu) && !"\u212a".match(/.\B/iu) && !"ลฟ".match(/.\B/iu);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return "ลฟ".match(/\w/iu) && !"ลฟ".match(/\W/iu) && "\u212a".match(/\w/iu) && !"\u212a".match(/\W/iu) && "\u212a".match(/.\b/iu) && "ลฟ".match(/.\b/iu) && !"\u212a".match(/.\B/iu) && !"ลฟ".match(/.\B/iu);
}
ยงarguments.caller removed
?
function(){
return (function () { 'use strict'; return !Object.getOwnPropertyDescriptor(arguments, 'caller'); })();
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
return (function () { 'use strict'; return !Object.getOwnPropertyDescriptor(arguments, 'caller'); })();
}

annex b

Object.prototype getter/setter methods

ยง__defineGetter__
?
function(){
var obj = {}; function bar() { return "bar"; } Object.prototype.__defineGetter__.call(obj, "foo", bar); var prop = Object.getOwnPropertyDescriptor(obj, "foo"); return prop.get === bar && !prop.writable && prop.configurable && prop.enumerable;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
function(){
var obj = {}; function bar() { return "bar"; } Object.prototype.__defineGetter__.call(obj, "foo", bar); var prop = Object.getOwnPropertyDescriptor(obj, "foo"); return prop.get === bar && !prop.writable && prop.configurable && prop.enumerable;
}
ยง__defineGetter__, symbols
?
function(){
var obj = {}; var sym = Symbol(); function bar() { return "bar"; } Object.prototype.__defineGetter__.call(obj, sym, bar); var prop = Object.getOwnPropertyDescriptor(obj, sym); return prop.get === bar && !prop.writable && prop.configurable && prop.enumerable;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var obj = {}; var sym = Symbol(); function bar() { return "bar"; } Object.prototype.__defineGetter__.call(obj, sym, bar); var prop = Object.getOwnPropertyDescriptor(obj, sym); return prop.get === bar && !prop.writable && prop.configurable && prop.enumerable;
}
ยง__defineGetter__, ToObject(this)
?
function(){
var key = '__accessors_test__'; __defineGetter__.call(1, key, function () {}); try { __defineGetter__.call(null, key, function () {}); } catch (e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
Flag
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
var key = '__accessors_test__'; __defineGetter__.call(1, key, function () {}); try { __defineGetter__.call(null, key, function () {}); } catch (e) { return true; }
}
ยง__defineSetter__
?
function(){
var obj = {}; function bar() {} Object.prototype.__defineSetter__.call(obj, "foo", bar); var prop = Object.getOwnPropertyDescriptor(obj, "foo"); return prop.set === bar && !prop.writable && prop.configurable && prop.enumerable;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var obj = {}; function bar() {} Object.prototype.__defineSetter__.call(obj, "foo", bar); var prop = Object.getOwnPropertyDescriptor(obj, "foo"); return prop.set === bar && !prop.writable && prop.configurable && prop.enumerable;
}
ยง__defineSetter__, symbols
?
function(){
var obj = {}; var sym = Symbol(); function bar(baz) {} Object.prototype.__defineSetter__.call(obj, sym, bar); var prop = Object.getOwnPropertyDescriptor(obj, sym); return prop.set === bar && !prop.writable && prop.configurable && prop.enumerable;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var obj = {}; var sym = Symbol(); function bar(baz) {} Object.prototype.__defineSetter__.call(obj, sym, bar); var prop = Object.getOwnPropertyDescriptor(obj, sym); return prop.set === bar && !prop.writable && prop.configurable && prop.enumerable;
}
ยง__defineSetter__, ToObject(this)
?
function(){
var key = '__accessors_test__'; __defineSetter__.call(1, key, function () {}); try { __defineSetter__.call(null, key, function () {}); } catch (e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
Flag
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
var key = '__accessors_test__'; __defineSetter__.call(1, key, function () {}); try { __defineSetter__.call(null, key, function () {}); } catch (e) { return true; }
}
ยง__lookupGetter__
?
function(){
var obj = { get foo() { return "bar"}, qux: 1 }; var foo = Object.prototype.__lookupGetter__.call(obj, "foo"); return foo() === "bar" && Object.prototype.__lookupGetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupGetter__.call(obj, "baz") === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
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Yes
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Yes
function(){
var obj = { get foo() { return "bar"}, qux: 1 }; var foo = Object.prototype.__lookupGetter__.call(obj, "foo"); return foo() === "bar" && Object.prototype.__lookupGetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupGetter__.call(obj, "baz") === void undefined;
}
ยง__lookupGetter__, prototype chain
?
function(){
var obj = { get foo() { return "bar"}, qux: 1 }; var foo = Object.prototype.__lookupGetter__.call(Object.create(obj), "foo"); return foo() === "bar" && Object.prototype.__lookupGetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupGetter__.call(obj, "baz") === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
function(){
var obj = { get foo() { return "bar"}, qux: 1 }; var foo = Object.prototype.__lookupGetter__.call(Object.create(obj), "foo"); return foo() === "bar" && Object.prototype.__lookupGetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupGetter__.call(obj, "baz") === void undefined;
}
ยง__lookupGetter__, symbols
?
function(){
var sym = Symbol(); var sym2 = Symbol(); var obj = {}; Object.defineProperty(obj, sym, { get: function () { return "bar"; }}); Object.defineProperty(obj, sym2, { value: 1 }); var foo = Object.prototype.__lookupGetter__.call(obj, sym); return foo() === "bar" && Object.prototype.__lookupGetter__.call(obj, sym2) === void undefined && Object.prototype.__lookupGetter__.call(obj, Symbol()) === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var sym = Symbol(); var sym2 = Symbol(); var obj = {}; Object.defineProperty(obj, sym, { get: function () { return "bar"; }}); Object.defineProperty(obj, sym2, { value: 1 }); var foo = Object.prototype.__lookupGetter__.call(obj, sym); return foo() === "bar" && Object.prototype.__lookupGetter__.call(obj, sym2) === void undefined && Object.prototype.__lookupGetter__.call(obj, Symbol()) === void undefined;
}
ยง__lookupGetter__, ToObject(this)
?
function(){
__lookupGetter__.call(1, 'key'); try { __lookupGetter__.call(null, 'key'); } catch (e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
Flag
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
__lookupGetter__.call(1, 'key'); try { __lookupGetter__.call(null, 'key'); } catch (e) { return true; }
}
ยง__lookupGetter__, data properties can shadow accessors
?
function(){
var a = {}; var b = Object.create(a); b.foo = 1; a.__defineGetter__("foo", function () {}); return b.__lookupGetter__("foo") === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
var a = {}; var b = Object.create(a); b.foo = 1; a.__defineGetter__("foo", function () {}); return b.__lookupGetter__("foo") === void undefined;
}
ยง__lookupSetter__
?
function(){
var obj = { set foo(baz) { return "bar"; }, qux: 1 }; var foo = Object.prototype.__lookupSetter__.call(obj, "foo"); return foo() === "bar" && Object.prototype.__lookupSetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupSetter__.call(obj, "baz") === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var obj = { set foo(baz) { return "bar"; }, qux: 1 }; var foo = Object.prototype.__lookupSetter__.call(obj, "foo"); return foo() === "bar" && Object.prototype.__lookupSetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupSetter__.call(obj, "baz") === void undefined;
}
ยง__lookupSetter__, prototype chain
?
function(){
var obj = { set foo(baz) { return "bar"; }, qux: 1 }; var foo = Object.prototype.__lookupSetter__.call(Object.create(obj), "foo"); return foo() === "bar" && Object.prototype.__lookupSetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupSetter__.call(obj, "baz") === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
var obj = { set foo(baz) { return "bar"; }, qux: 1 }; var foo = Object.prototype.__lookupSetter__.call(Object.create(obj), "foo"); return foo() === "bar" && Object.prototype.__lookupSetter__.call(obj, "qux") === void undefined && Object.prototype.__lookupSetter__.call(obj, "baz") === void undefined;
}
ยง__lookupSetter__, symbols
?
function(){
var sym = Symbol(); var sym2 = Symbol(); var obj = {}; Object.defineProperty(obj, sym, { set: function (baz) { return "bar"; }}); Object.defineProperty(obj, sym2, { value: 1 }); var foo = Object.prototype.__lookupSetter__.call(obj, sym); return foo() === "bar" && Object.prototype.__lookupSetter__.call(obj, sym2) === void undefined && Object.prototype.__lookupSetter__.call(obj, Symbol()) === void undefined;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
function(){
var sym = Symbol(); var sym2 = Symbol(); var obj = {}; Object.defineProperty(obj, sym, { set: function (baz) { return "bar"; }}); Object.defineProperty(obj, sym2, { value: 1 }); var foo = Object.prototype.__lookupSetter__.call(obj, sym); return foo() === "bar" && Object.prototype.__lookupSetter__.call(obj, sym2) === void undefined && Object.prototype.__lookupSetter__.call(obj, Symbol()) === void undefined;
}
ยง__lookupSetter__, ToObject(this)
?
function(){
__lookupSetter__.call(1, 'key'); try { __lookupSetter__.call(null, 'key'); } catch (e) { return true; }
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
Flag
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
__lookupSetter__.call(1, 'key'); try { __lookupSetter__.call(null, 'key'); } catch (e) { return true; }
}
ยง__lookupSetter__, data properties can shadow accessors
?
function(){
var a = {}; var b = Object.create(a); b.foo = 1; a.__defineSetter__("foo", function () {}) return b.__lookupSetter__("foo") === void undefined
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
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Yes
Yes
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Yes
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Yes
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Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
function(){
var a = {}; var b = Object.create(a); b.foo = 1; a.__defineSetter__("foo", function () {}) return b.__lookupSetter__("foo") === void undefined
}

Proxy internal calls, getter/setter methods

ยง__defineGetter__
?
function(){
// Object.prototype.__defineGetter__ -> DefinePropertyOrThrow -> [[DefineOwnProperty]] var def = []; var p = new Proxy({}, { defineProperty: function (o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; } }); Object.prototype.__defineGetter__.call(p, "foo", Object); return def + '' === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Object.prototype.__defineGetter__ -> DefinePropertyOrThrow -> [[DefineOwnProperty]] var def = []; var p = new Proxy({}, { defineProperty: function (o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; } }); Object.prototype.__defineGetter__.call(p, "foo", Object); return def + '' === "foo";
}
ยง__defineSetter__
?
function(){
// Object.prototype.__defineSetter__ -> DefinePropertyOrThrow -> [[DefineOwnProperty]] var def = []; var p = new Proxy({}, { defineProperty: function (o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; } }); Object.prototype.__defineSetter__.call(p, "foo", Object); return def + '' === "foo";
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Object.prototype.__defineSetter__ -> DefinePropertyOrThrow -> [[DefineOwnProperty]] var def = []; var p = new Proxy({}, { defineProperty: function (o, v, desc) { def.push(v); Object.defineProperty(o, v, desc); return true; } }); Object.prototype.__defineSetter__.call(p, "foo", Object); return def + '' === "foo";
}
ยง__lookupGetter__
?
function(){
// Object.prototype.__lookupGetter__ -> [[GetOwnProperty]] // Object.prototype.__lookupGetter__ -> [[GetPrototypeOf]] var gopd = []; var gpo = false; var p = new Proxy({}, { getPrototypeOf: function (o) { gpo = true; return Object.getPrototypeOf(o); }, getOwnPropertyDescriptor: function (o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); } }); Object.prototype.__lookupGetter__.call(p, "foo"); return gopd + '' === "foo" && gpo;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Object.prototype.__lookupGetter__ -> [[GetOwnProperty]] // Object.prototype.__lookupGetter__ -> [[GetPrototypeOf]] var gopd = []; var gpo = false; var p = new Proxy({}, { getPrototypeOf: function (o) { gpo = true; return Object.getPrototypeOf(o); }, getOwnPropertyDescriptor: function (o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); } }); Object.prototype.__lookupGetter__.call(p, "foo"); return gopd + '' === "foo" && gpo;
}
ยง__lookupSetter__
?
function(){
// Object.prototype.__lookupSetter__ -> [[GetOwnProperty]] // Object.prototype.__lookupSetter__ -> [[GetPrototypeOf]] var gopd = []; var gpo = false; var p = new Proxy({}, { getPrototypeOf: function (o) { gpo = true; return Object.getPrototypeOf(o); }, getOwnPropertyDescriptor: function (o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); } }); Object.prototype.__lookupSetter__.call(p, "foo"); return gopd + '' === "foo" && gpo;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
// Object.prototype.__lookupSetter__ -> [[GetOwnProperty]] // Object.prototype.__lookupSetter__ -> [[GetPrototypeOf]] var gopd = []; var gpo = false; var p = new Proxy({}, { getPrototypeOf: function (o) { gpo = true; return Object.getPrototypeOf(o); }, getOwnPropertyDescriptor: function (o, v) { gopd.push(v); return Object.getOwnPropertyDescriptor(o, v); } }); Object.prototype.__lookupSetter__.call(p, "foo"); return gopd + '' === "foo" && gpo;
}

ยงassignments allowed in for-in head in non-strict mode
?
function(){
for (var i = 0 in {}) {} return i === 0;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
for (var i = 0 in {}) {} return i === 0;
}

Node.js ES2018 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!95% complete95% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
95% complete95% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
95% complete95% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
95% complete95% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
90% complete90% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
95% complete95% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
90% complete90% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
90% complete90% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
86% complete86% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
95% complete95% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
90% complete90% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
86% complete86% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
86% complete86% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
86% complete86% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
81% complete81% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
90% complete90% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
86% complete86% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
81% complete81% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
81% complete81% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
77% complete77% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
81% complete81% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
77% complete77% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
77% complete77% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
77% complete77% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
77% complete77% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
77% complete77% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
77% complete77% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
77% complete77% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
81% complete81% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
77% complete77% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
77% complete77% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
77% complete77% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
72% complete72% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
72% complete72% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
77% complete77% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
72% complete72% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
72% complete72% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
72% complete72% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
72% complete72% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
63% complete63% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
59% complete59% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
63% complete63% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
54% complete54% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
54% complete54% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
54% complete54% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
54% complete54% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
40% complete22% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
31% complete9% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
31% complete9% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
18% complete0% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
4% complete0% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
4% complete0% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
4% complete0% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
4% complete0% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
0% complete0% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
0% complete0% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
0% complete0% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
0% complete0% complete

features

object rest/spread properties

ยงobject rest properties
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function(){
var { a, ...rest } = { a: 1, b: 2, c: 3 }; return a === 1 && rest.a === void undefined && rest.b === 2 && rest.c === 3;
}
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function(){
var { a, ...rest } = { a: 1, b: 2, c: 3 }; return a === 1 && rest.a === void undefined && rest.b === 2 && rest.c === 3;
}
ยงobject spread properties
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function(){
var spread = { b: 2, c: 3 }; var O = { a: 1, ...spread }; return O !== spread && (O.a + O.b + O.c) === 6;
}
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function(){
var spread = { b: 2, c: 3 }; var O = { a: 1, ...spread }; return O !== spread && (O.a + O.b + O.c) === 6;
}

Promise.prototype.finally

ยงbasic support
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function(){
var p1 = Promise.resolve("foo"); var p2 = Promise.reject("bar"); var score = 0; function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "bar"); check(); } function finallyFn() { score += (arguments.length === 0); check(); } p1.then(thenFn); p1.finally(finallyFn); p1.finally(function () { // should return a new Promise score += p1.finally() !== p1; check(); }); p2.catch (catchFn); p2.finally(finallyFn); function check() { if (score === 5) asyncTestPassed(); }
}
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function(){
var p1 = Promise.resolve("foo"); var p2 = Promise.reject("bar"); var score = 0; function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "bar"); check(); } function finallyFn() { score += (arguments.length === 0); check(); } p1.then(thenFn); p1.finally(finallyFn); p1.finally(function () { // should return a new Promise score += p1.finally() !== p1; check(); }); p2.catch (catchFn); p2.finally(finallyFn); function check() { if (score === 5) asyncTestPassed(); }
}
ยงdon't change resolution value
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function(){
var score = 0; function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "bar"); check(); } function finallyFn() { score++; check(); return Promise.resolve("foobar"); } Promise.resolve("foo").finally(finallyFn).then(thenFn); Promise.reject("bar").finally(finallyFn).catch(catchFn); function check() { if (score === 4) asyncTestPassed(); }
}
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function(){
var score = 0; function thenFn(result) { score += (result === "foo"); check(); } function catchFn(result) { score += (result === "bar"); check(); } function finallyFn() { score++; check(); return Promise.resolve("foobar"); } Promise.resolve("foo").finally(finallyFn).then(thenFn); Promise.reject("bar").finally(finallyFn).catch(catchFn); function check() { if (score === 4) asyncTestPassed(); }
}
ยงchange rejection value
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function(){
var score = 0; Promise .reject("foobar") .finally(function () { return Promise.reject("foo"); }) .catch (function (result) { score += (result === "foo"); check(); return Promise.reject("foobar"); }) .finally(function () { throw new Error('bar'); }) .catch (function (result) { score += (result.message === "bar"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}
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function(){
var score = 0; Promise .reject("foobar") .finally(function () { return Promise.reject("foo"); }) .catch (function (result) { score += (result === "foo"); check(); return Promise.reject("foobar"); }) .finally(function () { throw new Error('bar'); }) .catch (function (result) { score += (result.message === "bar"); check(); }); function check() { if (score === 2) asyncTestPassed(); }
}

ยงs (dotAll) flag for regular expressions
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function(){
const regex = /foo.bar/s; return regex.test('foo\nbar');
}
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function(){
const regex = /foo.bar/s; return regex.test('foo\nbar');
}
ยงRegExp named capture groups
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function(){
var result = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/.exec('2016-03-11'); return result.groups.year === '2016' && result.groups.month === '03' && result.groups.day === '11' && result[0] === '2016-03-11' && result[1] === '2016' && result[2] === '03' && result[3] === '11';
}
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function(){
var result = /(?<year>\d{4})-(?<month>\d{2})-(?<day>\d{2})/.exec('2016-03-11'); return result.groups.year === '2016' && result.groups.month === '03' && result.groups.day === '11' && result[0] === '2016-03-11' && result[1] === '2016' && result[2] === '03' && result[3] === '11';
}
ยงRegExp Lookbehind Assertions
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function(){
return /(?<=a)b/.test('ab') && /(?<!a)b/.test('cb') && !/(?<=a)b/.test('b');
}
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function(){
return /(?<=a)b/.test('ab') && /(?<!a)b/.test('cb') && !/(?<=a)b/.test('b');
}

RegExp Unicode Property Escapes

ยงbasic
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function(){
const regexGreekSymbol = /\p{Script=Greek}/u; return regexGreekSymbol.test('ฯ€');
}
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function(){
const regexGreekSymbol = /\p{Script=Greek}/u; return regexGreekSymbol.test('ฯ€');
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ยงUnicode 11
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function(){
return /\p{Extended_Pictographic}/u.test("\xA9") && /\p{Emoji}/u.test("๐Ÿฅฐ");
}
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function(){
return /\p{Extended_Pictographic}/u.test("\xA9") && /\p{Emoji}/u.test("๐Ÿฅฐ");
}
ยงUnicode 12
?
function(){
return /\p{Script=Elymaic}/u.test("\u{10fe0}") && /\p{Emoji}/u.test("๐Ÿฅฑ");
}
Yes
Yes
Yes
Yes
Yes
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Error
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Error
function(){
return /\p{Script=Elymaic}/u.test("\u{10fe0}") && /\p{Emoji}/u.test("๐Ÿฅฑ");
}
ยงUnicode 12.1
?
function(){
return /\p{Other_Symbol}/u.test("\u32FF");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
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Yes
Yes
Yes
Yes
Yes
Yes
No
No
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Error
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Error
function(){
return /\p{Other_Symbol}/u.test("\u32FF");
}
ยงUnicode 13
?
function(){
return /\p{Script=Chorasmian}/u.test("\u{10fb0}") && /\p{Emoji}/u.test("๐Ÿฅฒ");
}
Yes
Yes
Yes
Yes
Yes
Yes
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Error
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function(){
return /\p{Script=Chorasmian}/u.test("\u{10fb0}") && /\p{Emoji}/u.test("๐Ÿฅฒ");
}
ยงUnicode 14
?
function(){
return /\p{Script=Vithkuqi}/u.test("\u{10570}") && /\p{Emoji}/u.test("๐Ÿซ ");
}
Yes
Yes
Yes
Yes
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function(){
return /\p{Script=Vithkuqi}/u.test("\u{10570}") && /\p{Emoji}/u.test("๐Ÿซ ");
}
ยงUnicode 15
?
function(){
return /\p{Script=Kawi}/u.test("\u{11f00}") && /\p{Emoji}/u.test("๐Ÿซจ");
}
Yes
Yes
Yes
Yes
Yes
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Yes
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function(){
return /\p{Script=Kawi}/u.test("\u{11f00}") && /\p{Emoji}/u.test("๐Ÿซจ");
}
ยงUnicode 15.1
?
function(){
return /\p{Unified_Ideograph}/u.test("\u{2ebf0}");
}
Yes
Yes
Yes
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Yes
Yes
Yes
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Yes
Yes
Yes
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No
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No
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Error
function(){
return /\p{Unified_Ideograph}/u.test("\u{2ebf0}");
}
ยงUnicode 16.0
?
function(){
return /\p{Script=Todhri}/u.test("\u{105c0}") && /\p{Emoji}/u.test("๐Ÿซฉ");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
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Yes
Yes
Error
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Yes
Error
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function(){
return /\p{Script=Todhri}/u.test("\u{105c0}") && /\p{Emoji}/u.test("๐Ÿซฉ");
}
ยงUnicode 17.0
?
function(){
return /\p{Script=Sidetic}/u.test("\u{10940}") && /\p{Emoji}/u.test("๐Ÿซ");
}
Error
Error
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function(){
return /\p{Script=Sidetic}/u.test("\u{10940}") && /\p{Emoji}/u.test("๐Ÿซ");
}

Asynchronous Iterators

ยงasync generators
?
function(){
async function*generator() { yield 42; } var iterator = generator(); iterator.next().then(function (step) { if(iterator[Symbol.asyncIterator]() === iterator && step.done === false && step.value === 42)asyncTestPassed(); });
}
Yes
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Error
Flag
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function(){
async function*generator() { yield 42; } var iterator = generator(); iterator.next().then(function (step) { if(iterator[Symbol.asyncIterator]() === iterator && step.done === false && step.value === 42)asyncTestPassed(); });
}
ยงfor-await-of loops
?
function(){
var asyncIterable = {}; asyncIterable[Symbol.asyncIterator] = function () { var i = 0; return { next: function () { switch(++i) { case 1: return Promise.resolve({done: false, value: 'a'}); case 2: return Promise.resolve({done: false, value: 'b'}); } return Promise.resolve({done: true}); } }; }; (async function () { var result = ''; for await(var value of asyncIterable)result += value; if(result === 'ab')asyncTestPassed(); })();
}
Yes
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Error
Flag
Error
Error
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Error
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function(){
var asyncIterable = {}; asyncIterable[Symbol.asyncIterator] = function () { var i = 0; return { next: function () { switch(++i) { case 1: return Promise.resolve({done: false, value: 'a'}); case 2: return Promise.resolve({done: false, value: 'b'}); } return Promise.resolve({done: true}); } }; }; (async function () { var result = ''; for await(var value of asyncIterable)result += value; if(result === 'ab')asyncTestPassed(); })();
}

misc

ยงProxy "ownKeys" handler, duplicate keys for non-extensible targets
?
function(){
var p = new Proxy({}, { ownKeys() { return ["a", "a"]; } }); try { Object.keys(p); } catch (e) { return e instanceof TypeError; } return false;
}
Yes
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Yes
Yes
Yes
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Yes
Yes
No
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
var p = new Proxy({}, { ownKeys() { return ["a", "a"]; } }); try { Object.keys(p); } catch (e) { return e instanceof TypeError; } return false;
}
ยงtemplate literal revision
?
function(){
function tag(strings, a) { return strings[0] === void undefined && strings.raw[0] === "\\01\\1\\xg\\xAg\\u0\\u0g\\u00g\\u000g\\u{g\\u{0\\u{110000}" && strings[1] === "\0" && strings.raw[1] === "\\0" && a === 0; } return tag`\01\1\xg\xAg\u0\u0g\u00g\u000g\u{g\u{0\u{110000}${0}\0`;
}
Yes
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Yes
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Yes
Error
Flag
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
function tag(strings, a) { return strings[0] === void undefined && strings.raw[0] === "\\01\\1\\xg\\xAg\\u0\\u0g\\u00g\\u000g\\u{g\\u{0\\u{110000}" && strings[1] === "\0" && strings.raw[1] === "\\0" && a === 0; } return tag`\01\1\xg\xAg\u0\u0g\u00g\u000g\u{g\u{0\u{110000}${0}\0`;
}

Node.js ES2019 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
100% complete100% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
100% complete100% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
100% complete100% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
100% complete100% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
100% complete100% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
100% complete100% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
100% complete100% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
100% complete100% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
100% complete100% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
100% complete100% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
100% complete100% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
100% complete100% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
100% complete100% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
100% complete100% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
100% complete100% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
100% complete100% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
100% complete100% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
100% complete100% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
100% complete100% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
100% complete100% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
100% complete100% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
100% complete100% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
100% complete100% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
100% complete100% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
100% complete100% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
100% complete100% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
100% complete100% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
100% complete100% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
100% complete100% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
100% complete100% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
100% complete100% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
100% complete100% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
100% complete100% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
100% complete100% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
100% complete100% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
100% complete100% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
100% complete100% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
87% complete87% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
66% complete66% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
66% complete66% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
66% complete66% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
66% complete66% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
66% complete66% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
37% complete25% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
37% complete25% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
37% complete25% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
25% complete25% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
25% complete25% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
25% complete25% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
25% complete25% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
25% complete25% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
25% complete16% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
16% complete16% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
16% complete12% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
12% complete12% complete

features

Symbol.prototype.description

ยงbasic
?
function(){
return Symbol('foo').description === 'foo';
}
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function(){
return Symbol('foo').description === 'foo';
}
ยงempty description
?
function(){
return Symbol('').description === '';
}
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function(){
return Symbol('').description === '';
}
ยงundefined description
?
function(){
return Symbol.prototype.hasOwnProperty('description') && Symbol().description === void undefined;
}
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function(){
return Symbol.prototype.hasOwnProperty('description') && Symbol().description === void undefined;
}

ยงObject.fromEntries
?
function(){
var object = Object.fromEntries(new Map([['foo', 42], ['bar', 23]])); return object.foo === 42 && object.bar === 23;
}
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function(){
var object = Object.fromEntries(new Map([['foo', 42], ['bar', 23]])); return object.foo === 42 && object.bar === 23;
}

string trimming

ยงString.prototype.trimLeft
?
function(){
return ' \t \n abc \t\n'.trimLeft() === 'abc \t\n';
}
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function(){
return ' \t \n abc \t\n'.trimLeft() === 'abc \t\n';
}
ยงString.prototype.trimRight
?
function(){
return ' \t \n abc \t\n'.trimRight() === ' \t \n abc';
}
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function(){
return ' \t \n abc \t\n'.trimRight() === ' \t \n abc';
}
ยงString.prototype.trimStart
?
function(){
return ' \t \n abc \t\n'.trimStart() === 'abc \t\n';
}
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function(){
return ' \t \n abc \t\n'.trimStart() === 'abc \t\n';
}
ยงString.prototype.trimEnd
?
function(){
return ' \t \n abc \t\n'.trimEnd() === ' \t \n abc';
}
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function(){
return ' \t \n abc \t\n'.trimEnd() === ' \t \n abc';
}

Array.prototype.{flat, flatMap}

ยงArray.prototype.flat
?
function(){
return [1, [2, 3], [4, [5, 6]]].flat().join('') === '12345,6';
}
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function(){
return [1, [2, 3], [4, [5, 6]]].flat().join('') === '12345,6';
}
ยงArray.prototype.flatMap
?
function(){
return [{a: 1, b: 2}, {a: 3, b: 4}].flatMap(function (it) { return [it.a, it.b]; }).join('') === '1234';
}
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function(){
return [{a: 1, b: 2}, {a: 3, b: 4}].flatMap(function (it) { return [it.a, it.b]; }).join('') === '1234';
}
ยงflat and flatMap in Array.prototype[@@unscopables]
?
function(){
return Array.prototype[Symbol.unscopables].flat && Array.prototype[Symbol.unscopables].flatMap;
}
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function(){
return Array.prototype[Symbol.unscopables].flat && Array.prototype[Symbol.unscopables].flatMap;
}

misc

optional catch binding

ยงbasic
?
function(){
try { throw new Error(); } catch { return true; } return false;
}
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function(){
try { throw new Error(); } catch { return true; } return false;
}
ยงawait
?
function(){
(async function () { try { await Promise.reject(); } catch { asyncTestPassed(); } })();
}
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function(){
(async function () { try { await Promise.reject(); } catch { asyncTestPassed(); } })();
}
ยงyield
?
function(){
function *foo() { try { yield; } catch { return true; } } var it = foo(); it.next(); return it.throw().value;
}
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function(){
function *foo() { try { yield; } catch { return true; } } var it = foo(); it.next(); return it.throw().value;
}

Function.prototype.toString revision

ยงfunctions created with the Function constructor
?
function(){
var fn = Function('a', ' /\x2A a \x2A/ b, c /\x2A b \x2A/ //', '/\x2A c \x2A/ ; /\x2A d \x2A/ //'); var str = 'function anonymous(a, /\x2A a \x2A/ b, c /\x2A b \x2A/ //\n) {\n/\x2A c \x2A/ ; /\x2A d \x2A/ //\n}'; return fn + '' === str;
}
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function(){
var fn = Function('a', ' /\x2A a \x2A/ b, c /\x2A b \x2A/ //', '/\x2A c \x2A/ ; /\x2A d \x2A/ //'); var str = 'function anonymous(a, /\x2A a \x2A/ b, c /\x2A b \x2A/ //\n) {\n/\x2A c \x2A/ ; /\x2A d \x2A/ //\n}'; return fn + '' === str;
}
ยงarrows
?
function(){
var str = 'a => b'; return eval('(' + str + ')') + '' === str;
}
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function(){
var str = 'a => b'; return eval('(' + str + ')') + '' === str;
}
ยง[native code]
?
function(){
const NATIVE_EVAL_RE = /\bfunction\b[\s\S]*\beval\b[\s\S]*\([\s\S]*\)[\s\S]*\{[\s\S]*\[[\s\S]*\bnative\b[\s\S]+\bcode\b[\s\S]*\][\s\S]*\}/; return NATIVE_EVAL_RE.test(eval + '');
}
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function(){
const NATIVE_EVAL_RE = /\bfunction\b[\s\S]*\beval\b[\s\S]*\([\s\S]*\)[\s\S]*\{[\s\S]*\[[\s\S]*\bnative\b[\s\S]+\bcode\b[\s\S]*\][\s\S]*\}/; return NATIVE_EVAL_RE.test(eval + '');
}
ยงclass expression with implicit constructor
?
function(){
var str = 'class A {}'; return eval('(' + str + ')') + '' === str;
}
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function(){
var str = 'class A {}'; return eval('(' + str + ')') + '' === str;
}
ยงclass expression with explicit constructor
?
function(){
var str = 'class /\x2A a \x2A/ A /\x2A b \x2A/ extends /\x2A c \x2A/ function B() {} /\x2A d \x2A/ { /\x2A e \x2A/ constructor /\x2A f \x2A/ ( /\x2A g \x2A/ ) /\x2A h \x2A/ { /\x2A i \x2A/ ; /\x2A j \x2A/ } /\x2A k \x2A/ m /\x2A l \x2A/ ( /\x2A m \x2A/ ) /\x2A n \x2A/ { /\x2A o \x2A/ } /\x2A p \x2A/ }'; return eval('(/\x2A before \x2A/' + str + '/\x2A after \x2A/)') + '' === str;
}
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function(){
var str = 'class /\x2A a \x2A/ A /\x2A b \x2A/ extends /\x2A c \x2A/ function B() {} /\x2A d \x2A/ { /\x2A e \x2A/ constructor /\x2A f \x2A/ ( /\x2A g \x2A/ ) /\x2A h \x2A/ { /\x2A i \x2A/ ; /\x2A j \x2A/ } /\x2A k \x2A/ m /\x2A l \x2A/ ( /\x2A m \x2A/ ) /\x2A n \x2A/ { /\x2A o \x2A/ } /\x2A p \x2A/ }'; return eval('(/\x2A before \x2A/' + str + '/\x2A after \x2A/)') + '' === str;
}
ยงunicode escape sequences in identifiers
?
function(){
var str = 'function \\u0061(\\u{62}, \\u0063) { \\u0062 = \\u{00063}; return b; }'; return eval('(/\x2A before \x2A/' + str + '/\x2A after \x2A/)') + '' === str;
}
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function(){
var str = 'function \\u0061(\\u{62}, \\u0063) { \\u0062 = \\u{00063}; return b; }'; return eval('(/\x2A before \x2A/' + str + '/\x2A after \x2A/)') + '' === str;
}
ยงmethods and computed property names
?
function(){
var str = '[ /\x2A a \x2A/ "f" /\x2A b \x2A/ ] /\x2A c \x2A/ ( /\x2A d \x2A/ ) /\x2A e \x2A/ { /\x2A f \x2A/ }'; return eval('({ /\x2A before \x2A/' + str + '/\x2A after \x2A/ }.f)') + '' === str;
}
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function(){
var str = '[ /\x2A a \x2A/ "f" /\x2A b \x2A/ ] /\x2A c \x2A/ ( /\x2A d \x2A/ ) /\x2A e \x2A/ { /\x2A f \x2A/ }'; return eval('({ /\x2A before \x2A/' + str + '/\x2A after \x2A/ }.f)') + '' === str;
}

JSON superset

ยงLINE SEPARATOR can appear in string literals
?
function(){
return eval("'\u2028'") === "\u2028";
}
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function(){
return eval("'\u2028'") === "\u2028";
}
ยงPARAGRAPH SEPARATOR can appear in string literals
?
function(){
return eval("'\u2029'") === "\u2029";
}
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function(){
return eval("'\u2029'") === "\u2029";
}

ยงWell-formed JSON.stringify
?
function(){
return JSON.stringify('\uDF06\uD834') === "\"\\udf06\\ud834\"" && JSON.stringify('\uDEAD') === "\"\\udead\"";
}
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function(){
return JSON.stringify('\uDF06\uD834') === "\"\\udf06\\ud834\"" && JSON.stringify('\uDEAD') === "\"\\udead\"";
}

Node.js ES2020 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
100% complete100% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
100% complete100% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
100% complete100% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
100% complete100% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
100% complete100% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
100% complete100% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
100% complete100% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
100% complete100% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
100% complete100% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
100% complete100% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
100% complete100% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
100% complete100% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
100% complete100% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
100% complete100% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
100% complete100% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
100% complete100% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
100% complete100% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
100% complete100% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
100% complete100% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
100% complete100% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
100% complete100% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
100% complete100% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
100% complete100% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
94% complete94% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
94% complete94% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
94% complete94% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
94% complete94% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
94% complete94% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
89% complete63% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
89% complete63% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
63% complete63% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
63% complete63% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
63% complete63% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
63% complete63% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
63% complete57% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
57% complete57% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
57% complete57% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
57% complete42% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
47% complete42% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
47% complete42% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
42% complete42% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
42% complete42% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
0% complete0% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
0% complete0% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
0% complete0% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
0% complete0% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
0% complete0% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
0% complete0% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
0% complete0% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
0% complete0% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
0% complete0% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
0% complete0% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
0% complete0% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
0% complete0% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
0% complete0% complete

features

String.prototype.matchAll

ยงbasic functionality
?
function(){
var iterator = '11a2bb'.matchAll(/(\d)(\D)/g); if(iterator[Symbol.iterator]() !== iterator)return false; var a = '', b = '', c = '', step; while(!(step = iterator.next()).done) { a += step.value[0]; b += step.value[1]; c += step.value[2]; } return a === '1a2b' && b === '12' && c === 'ab';
}
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function(){
var iterator = '11a2bb'.matchAll(/(\d)(\D)/g); if(iterator[Symbol.iterator]() !== iterator)return false; var a = '', b = '', c = '', step; while(!(step = iterator.next()).done) { a += step.value[0]; b += step.value[1]; c += step.value[2]; } return a === '1a2b' && b === '12' && c === 'ab';
}
ยงthrows on non-global regex
?
function(){
if (typeof String.prototype.matchAll !== 'function') return false; try { '11a2bb'.matchAll(/(\d)(\D)/); } catch (e) { return true; }
}
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function(){
if (typeof String.prototype.matchAll !== 'function') return false; try { '11a2bb'.matchAll(/(\d)(\D)/); } catch (e) { return true; }
}

BigInt

ยงbasic functionality
?
function(){
return (1n + 2n) === 3n;
}
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function(){
return (1n + 2n) === 3n;
}
ยงconstructor
?
function(){
return BigInt("3") === 3n;
}
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function(){
return BigInt("3") === 3n;
}
ยงBigInt.asUintN
?
function(){
return typeof BigInt.asUintN === 'function';
}
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function(){
return typeof BigInt.asUintN === 'function';
}
ยงBigInt.asIntN
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function(){
return typeof BigInt.asIntN === 'function';
}
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function(){
return typeof BigInt.asIntN === 'function';
}
ยงBigInt64Array
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function(){
var buffer = new ArrayBuffer(64); var view = new BigInt64Array(buffer); view[0] = 0x8000000000000000n; return view[0] === -0x8000000000000000n;
}
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function(){
var buffer = new ArrayBuffer(64); var view = new BigInt64Array(buffer); view[0] = 0x8000000000000000n; return view[0] === -0x8000000000000000n;
}
ยงBigUint64Array
?
function(){
var buffer = new ArrayBuffer(64); var view = new BigUint64Array(buffer); view[0] = 0x10000000000000000n; return view[0] === 0n;
}
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function(){
var buffer = new ArrayBuffer(64); var view = new BigUint64Array(buffer); view[0] = 0x10000000000000000n; return view[0] === 0n;
}
ยงDataView.prototype.getBigInt64
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setBigInt64(0, 1n); return view.getBigInt64(0) === 1n;
}
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function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setBigInt64(0, 1n); return view.getBigInt64(0) === 1n;
}
ยงDataView.prototype.getBigUint64
?
function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setBigUint64(0, 1n); return view.getBigUint64(0) === 1n;
}
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function(){
var buffer = new ArrayBuffer(64); var view = new DataView(buffer); view.setBigUint64(0, 1n); return view.getBigUint64(0) === 1n;
}

ยงPromise.allSettled
?
function(){
Promise.allSettled([ Promise.resolve(1), Promise.reject(2), Promise.resolve(3) ]).then(it => { if ( it.length === 3 && it[0].status === 'fulfilled' && it[0].value === 1 && it[1].status === 'rejected' && it[1].reason === 2 && it[2].status === 'fulfilled' && it[2].value === 3 ) asyncTestPassed(); });
}
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function(){
Promise.allSettled([ Promise.resolve(1), Promise.reject(2), Promise.resolve(3) ]).then(it => { if ( it.length === 3 && it[0].status === 'fulfilled' && it[0].value === 1 && it[1].status === 'rejected' && it[1].reason === 2 && it[2].status === 'fulfilled' && it[2].value === 3 ) asyncTestPassed(); });
}
ยงnullish coalescing operator (??)
?
function(){
return (null ?? 42) === 42 && (undefined ?? 42) === 42 && (false ?? 42) === false && ('' ?? 42) === '' && (0 ?? 42) === 0 && isNaN(NaN ?? 42);
}
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function(){
return (null ?? 42) === 42 && (undefined ?? 42) === 42 && (false ?? 42) === false && ('' ?? 42) === '' && (0 ?? 42) === 0 && isNaN(NaN ?? 42);
}

globalThis

ยง"globalThis" global property is global object
?
function(){
var actualGlobal = Function('return this')(); actualGlobal.__system_global_test__ = 42; return typeof globalThis === 'object' && globalThis && globalThis === actualGlobal && !globalThis.lacksGlobalThis && globalThis.__system_global_test__ === 42;
}
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function(){
var actualGlobal = Function('return this')(); actualGlobal.__system_global_test__ = 42; return typeof globalThis === 'object' && globalThis && globalThis === actualGlobal && !globalThis.lacksGlobalThis && globalThis.__system_global_test__ === 42;
}
ยง"globalThis" global property has correct property descriptor
?
function(){
var actualGlobal = Function('return this')(); if (typeof globalThis !== 'object') { return false; } if (!('globalThis' in actualGlobal)) { return false; } if (Object.prototype.propertyIsEnumerable.call(actualGlobal, 'globalThis')) { return false; } var descriptor = Object.getOwnPropertyDescriptor(actualGlobal, 'globalThis'); return descriptor.value === actualGlobal && !descriptor.enumerable && descriptor.configurable && descriptor.writable;
}
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function(){
var actualGlobal = Function('return this')(); if (typeof globalThis !== 'object') { return false; } if (!('globalThis' in actualGlobal)) { return false; } if (Object.prototype.propertyIsEnumerable.call(actualGlobal, 'globalThis')) { return false; } var descriptor = Object.getOwnPropertyDescriptor(actualGlobal, 'globalThis'); return descriptor.value === actualGlobal && !descriptor.enumerable && descriptor.configurable && descriptor.writable;
}

optional chaining operator (?.)

ยงoptional property access
?
function(){
var foo = { baz: 42 }; var bar = null; return foo?.baz === 42 && bar?.baz === void undefined;
}
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function(){
var foo = { baz: 42 }; var bar = null; return foo?.baz === 42 && bar?.baz === void undefined;
}
ยงoptional bracket access
?
function(){
var foo = { baz: 42 }; var bar = null; return foo?.['baz'] === 42 && bar?.['baz'] === void undefined;
}
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function(){
var foo = { baz: 42 }; var bar = null; return foo?.['baz'] === 42 && bar?.['baz'] === void undefined;
}
ยงoptional method call
?
function(){
var foo = { baz: function () { return this.value; }, value: 42 }; var bar = null; return foo?.baz() === 42 && bar?.baz() === void undefined;
}
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function(){
var foo = { baz: function () { return this.value; }, value: 42 }; var bar = null; return foo?.baz() === 42 && bar?.baz() === void undefined;
}
ยงoptional function call
?
function(){
var foo = { baz: function () { return 42; } }; var bar = {}; function baz() { return 42; }; var n; return foo.baz?.() === 42 && bar.baz?.() === void undefined && baz?.() === 42 && n?.() === void undefined;
}
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var foo = { baz: function () { return 42; } }; var bar = {}; function baz() { return 42; }; var n; return foo.baz?.() === 42 && bar.baz?.() === void undefined && baz?.() === 42 && n?.() === void undefined;
}
ยงspread parameters after optional chaining
?
function(){
var fn = null; var n = null; var o = {}; return fn?.(...[], 1) === void undefined && fn?.(...[], ...[]) === void undefined && o.method?.(...[], 1) === void undefined && n?.method(...[], 1) === void undefined;
}
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var fn = null; var n = null; var o = {}; return fn?.(...[], 1) === void undefined && fn?.(...[], ...[]) === void undefined && o.method?.(...[], 1) === void undefined && n?.method(...[], 1) === void undefined;
}

Node.js ES2021 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
100% complete100% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
100% complete100% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
100% complete100% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
100% complete100% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
100% complete100% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
100% complete100% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
100% complete100% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
100% complete100% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
100% complete100% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
100% complete100% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
100% complete100% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
100% complete100% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
100% complete100% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
100% complete100% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
100% complete100% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
100% complete100% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
100% complete100% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
100% complete100% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
100% complete100% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
100% complete100% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
100% complete100% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
100% complete100% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
100% complete100% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
100% complete100% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
100% complete100% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
100% complete20% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
100% complete20% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
6% complete6% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
6% complete6% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
6% complete6% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
6% complete6% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
6% complete6% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
6% complete6% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
6% complete6% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
6% complete6% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
6% complete0% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
6% complete0% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
6% complete0% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
6% complete0% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
6% complete0% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
6% complete0% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
6% complete0% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
0% complete0% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
0% complete0% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
0% complete0% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
0% complete0% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
0% complete0% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
0% complete0% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
0% complete0% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
0% complete0% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
0% complete0% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
0% complete0% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
0% complete0% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
0% complete0% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
0% complete0% complete

features

ยงString.prototype.replaceAll
?
function(){
return 'q=query+string+parameters'.replaceAll('+', ' ') === 'q=query string parameters';
}
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function(){
return 'q=query+string+parameters'.replaceAll('+', ' ') === 'q=query string parameters';
}
ยงnumeric separators
?
function(){
return 1_000_000.000_001 === 1000000.000001 && 0b1010_0001_1000_0101 === 0b1010000110000101;
}
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function(){
return 1_000_000.000_001 === 1000000.000001 && 0b1010_0001_1000_0101 === 0b1010000110000101;
}

Promise.any

ยงfulfillment
?
function(){
Promise.any([ Promise.reject(1), Promise.resolve(2), Promise.resolve(3) ]).then(it => { if (it === 2) asyncTestPassed(); });
}
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function(){
Promise.any([ Promise.reject(1), Promise.resolve(2), Promise.resolve(3) ]).then(it => { if (it === 2) asyncTestPassed(); });
}
ยงAggregateError
?
function(){
Promise.any([ Promise.reject(1), Promise.reject(2), Promise.reject(3) ]).catch (error => { if (error instanceof AggregateError && error.errors.length === 3) asyncTestPassed(); });
}
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function(){
Promise.any([ Promise.reject(1), Promise.reject(2), Promise.reject(3) ]).catch (error => { if (error instanceof AggregateError && error.errors.length === 3) asyncTestPassed(); });
}

WeakReferences

ยงWeakRef minimal support
?
function(){
var O = {}; var weakref = new WeakRef(O); return weakref.deref() === O;
}
Yes
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function(){
var O = {}; var weakref = new WeakRef(O); return weakref.deref() === O;
}
ยงFinalizationRegistry minimal support
?
function(){
var fr = new FinalizationRegistry(function () {}); return Object.getPrototypeOf(fr) === FinalizationRegistry.prototype;
}
Yes
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function(){
var fr = new FinalizationRegistry(function () {}); return Object.getPrototypeOf(fr) === FinalizationRegistry.prototype;
}

Logical Assignment

ยง||= basic support
?
function(){
let a; let b = 0; let c = 1; a ||= 2; b ||= 2; c ||= 2; return a === 2 && b === 2 && c === 1;
}
Yes
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function(){
let a; let b = 0; let c = 1; a ||= 2; b ||= 2; c ||= 2; return a === 2 && b === 2 && c === 1;
}
ยง||= short-circuiting behaviour
?
function(){
let a = 1; let i = 1; a ||= ++i; return a === 1 && i === 1;
}
Yes
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function(){
let a = 1; let i = 1; a ||= ++i; return a === 1 && i === 1;
}
ยง||= setter not unecessarily invoked
?
function(){
let i = 1; var obj = { get x() { return 1 }, set x(n) { i++; } }; obj.x ||= 2; return i === 1;
}
Yes
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function(){
let i = 1; var obj = { get x() { return 1 }, set x(n) { i++; } }; obj.x ||= 2; return i === 1;
}
ยง&&= basic support
?
function(){
let a; let b = 0; let c = 1; a &&= 2; b &&= 2; c &&= 2; return typeof a === 'undefined' && b === 0 && c === 2;
}
Yes
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function(){
let a; let b = 0; let c = 1; a &&= 2; b &&= 2; c &&= 2; return typeof a === 'undefined' && b === 0 && c === 2;
}
ยง&&= short-circuiting behaviour
?
function(){
let a; let i = 1; a &&= ++i; return typeof a === 'undefined' && i === 1;
}
Yes
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function(){
let a; let i = 1; a &&= ++i; return typeof a === 'undefined' && i === 1;
}
ยง&&= setter not unecessarily invoked
?
function(){
let i = 1; var obj = { get x() { return }, set x(n) { i++; } }; obj.x &&= 2; return i === 1;
}
Yes
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function(){
let i = 1; var obj = { get x() { return }, set x(n) { i++; } }; obj.x &&= 2; return i === 1;
}
ยง??= basic support
?
function(){
let a; let b = 0; let c = 1; a ??= 2; b ??= 2; c ??= 2; return a === 2 && b === 0 && c === 1;
}
Yes
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function(){
let a; let b = 0; let c = 1; a ??= 2; b ??= 2; c ??= 2; return a === 2 && b === 0 && c === 1;
}
ยง??= short-circuiting behaviour
?
function(){
let a = 1; let i = 1; a ??= ++i; return a === 1 && i === 1;
}
Yes
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function(){
let a = 1; let i = 1; a ??= ++i; return a === 1 && i === 1;
}
ยง??= setter not unecessarily invoked
?
function(){
let i = 1; var obj = { get x() { return 1 }, set x(n) { i++; } }; obj.x ??= 2; return i === 1;
}
Yes
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function(){
let i = 1; var obj = { get x() { return 1 }, set x(n) { i++; } }; obj.x ??= 2; return i === 1;
}

Node.js ES2022 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
100% complete100% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
100% complete100% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
100% complete100% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
100% complete100% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
100% complete100% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
100% complete100% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
100% complete100% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
100% complete100% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
100% complete100% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
97% complete97% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
97% complete97% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
97% complete97% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
97% complete97% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
97% complete97% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
97% complete97% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
97% complete97% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
97% complete97% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
97% complete97% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
97% complete97% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
77% complete75% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
92% complete70% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
72% complete62% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
72% complete60% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
72% complete60% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
57% complete57% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
57% complete55% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
57% complete55% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
52% complete42% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
55% complete40% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
55% complete40% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
40% complete40% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
40% complete40% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
40% complete40% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
40% complete40% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
40% complete40% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
40% complete40% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
40% complete40% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
30% complete17% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
30% complete17% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
30% complete17% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
30% complete17% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
30% complete17% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
30% complete17% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
17% complete17% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
17% complete17% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
17% complete17% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
17% complete17% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
17% complete17% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
17% complete17% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
17% complete17% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
17% complete17% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
17% complete17% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
17% complete17% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
17% complete17% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
17% complete17% complete

features

instance class fields

ยงpublic instance class fields
?
function(){
class C { x = 'x'; } return new C().x === 'x';
}
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function(){
class C { x = 'x'; } return new C().x === 'x';
}
ยงprivate instance class fields basic support
?
function(){
class C { #x; constructor(x) { this.#x = x; } x() { return this.#x; } } return new C(42).x() === 42;
}
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function(){
class C { #x; constructor(x) { this.#x = x; } x() { return this.#x; } } return new C(42).x() === 42;
}
ยงprivate instance class fields initializers
?
function(){
class C { #x = 42; x() { return this.#x; } } return new C().x() === 42;
}
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function(){
class C { #x = 42; x() { return this.#x; } } return new C().x() === 42;
}
ยงoptional private instance class fields access
?
function(){
class C { #x = 42; x(o = this) { return o?.#x; } } return new C().x() === 42 && new C().x(null) === void undefined;
}
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function(){
class C { #x = 42; x(o = this) { return o?.#x; } } return new C().x() === 42 && new C().x(null) === void undefined;
}
ยงoptional deep private instance class fields access
?
function(){
class C { #x = 42; x(o = { p: this }) { return o?.p.#x; } } return new C().x() === 42 && new C().x(null) === void undefined;
}
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function(){
class C { #x = 42; x(o = { p: this }) { return o?.p.#x; } } return new C().x() === 42 && new C().x(null) === void undefined;
}
ยงcomputed instance class fields
?
function(){
class C { ['x'] = 42; } return new C().x === 42;
}
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function(){
class C { ['x'] = 42; } return new C().x === 42;
}
ยงresolving identifier in parent scope
?
function(){
{ let a = ["hello world"]; class MyClass { // The parenthesis below are required to trigger https://bugs.webkit.org/show_bug.cgi?id=236843 c = a[(0)]; } return new MyClass().c === a[0]; }
}
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function(){
{ let a = ["hello world"]; class MyClass { // The parenthesis below are required to trigger https://bugs.webkit.org/show_bug.cgi?id=236843 c = a[(0)]; } return new MyClass().c === a[0]; }
}

static class fields

ยงpublic static class fields
?
function(){
class C { static x = 'x'; } return C.x === 'x';
}
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function(){
class C { static x = 'x'; } return C.x === 'x';
}
ยงstatic class fields use [[Define]]
?
function(){
return (class X { static name = "name"; }).name === 'name';
}
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function(){
return (class X { static name = "name"; }).name === 'name';
}
ยงprivate static class fields
?
function(){
class C { static #x = 42; x() { return C.#x; } } return new C().x() === 42;
}
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function(){
class C { static #x = 42; x() { return C.#x; } } return new C().x() === 42;
}
ยงcomputed static class fields
?
function(){
class C { static ['x'] = 42; } return C.x === 42;
}
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function(){
class C { static ['x'] = 42; } return C.x === 42;
}

private class methods

ยงprivate instance methods
?
function(){
class C { #x() { return 42; } x() { return this.#x(); } } return new C().x() === 42;
}
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function(){
class C { #x() { return 42; } x() { return this.#x(); } } return new C().x() === 42;
}
ยงprivate static methods
?
function(){
class C { static #x() { return 42; } x() { return C.#x(); } } return new C().x() === 42;
}
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function(){
class C { static #x() { return 42; } x() { return C.#x(); } } return new C().x() === 42;
}
ยงprivate accessor properties
?
function(){
var y = false; class C { get #x() { return 42; } set #x(x) { y = x; } x() { this.#x = true; return this.#x; } } return new C().x() === 42 && y;
}
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function(){
var y = false; class C { get #x() { return 42; } set #x(x) { y = x; } x() { this.#x = true; return this.#x; } } return new C().x() === 42 && y;
}
ยงprivate static accessor properties
?
function(){
var y = false; class C { static get #x() { return 42; } static set #x(x) { y = x; } x() { C.#x = true; return C.#x; } } return new C().x() === 42 && y;
}
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function(){
var y = false; class C { static get #x() { return 42; } static set #x(x) { y = x; } x() { C.#x = true; return C.#x; } } return new C().x() === 42 && y;
}

ยงErgonomic brand checks for private fields
?
function(){
class A { #x; static check(obj) { return #x in obj; } } return A.check(new A) && !A.check({});
}
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function(){
class A { #x; static check(obj) { return #x in obj; } } return A.check(new A) && !A.check({});
}
ยงClass static initialization blocks
?
function(){
let ok = false; class A { static { ok = true; } } return ok;
}
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function(){
let ok = false; class A { static { ok = true; } } return ok;
}

.at() method on the built-in indexables

ยงArray.prototype.at()
?
function(){
var arr = [1, 2, 3]; return arr.at(0) === 1 && arr.at(-3) === 1 && arr.at(1) === 2 && arr.at(-2) === 2 && arr.at(2) === 3 && arr.at(-1) === 3 && arr.at(3) === undefined && arr.at(-4) === undefined;
}
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function(){
var arr = [1, 2, 3]; return arr.at(0) === 1 && arr.at(-3) === 1 && arr.at(1) === 2 && arr.at(-2) === 2 && arr.at(2) === 3 && arr.at(-1) === 3 && arr.at(3) === undefined && arr.at(-4) === undefined;
}
ยงString.prototype.at()
?
function(){
var str = 'abc'; return str.at(0) === 'a' && str.at(-3) === 'a' && str.at(1) === 'b' && str.at(-2) === 'b' && str.at(2) === 'c' && str.at(-1) === 'c' && str.at(3) === undefined && str.at(-4) === undefined;
}
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function(){
var str = 'abc'; return str.at(0) === 'a' && str.at(-3) === 'a' && str.at(1) === 'b' && str.at(-2) === 'b' && str.at(2) === 'c' && str.at(-1) === 'c' && str.at(3) === undefined && str.at(-4) === undefined;
}
ยง%TypedArray%.prototype.at()
?
function(){
return [ 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ].every(function (TypedArray) { var Constructor = globalThis[TypedArray]; if (typeof Constructor !== 'function') { return false; } var arr = new Constructor([1, 2, 3]); return arr.at(0) === 1 && arr.at(-3) === 1 && arr.at(1) === 2 && arr.at(-2) === 2 && arr.at(2) === 3 && arr.at(-1) === 3 && arr.at(3) === undefined && arr.at(-4) === undefined; });
}
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function(){
return [ 'Int8Array', 'Uint8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array' ].every(function (TypedArray) { var Constructor = globalThis[TypedArray]; if (typeof Constructor !== 'function') { return false; } var arr = new Constructor([1, 2, 3]); return arr.at(0) === 1 && arr.at(-3) === 1 && arr.at(1) === 2 && arr.at(-2) === 2 && arr.at(2) === 3 && arr.at(-1) === 3 && arr.at(3) === undefined && arr.at(-4) === undefined; });
}

Object.hasOwn

ยงBasic functionality
?
function(){
return Object.hasOwn({ x: 2 }, "x") === true;
}
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function(){
return Object.hasOwn({ x: 2 }, "x") === true;
}
ยงToObject called before ToPropertyKey
?
function(){
var ok = !!Object.hasOwn; try { Object.hasOwn(null, { toString: function () { ok = false } }); return false; } catch (e) { return ok; }
}
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function(){
var ok = !!Object.hasOwn; try { Object.hasOwn(null, { toString: function () { ok = false } }); return false; } catch (e) { return ok; }
}

Error.cause property

ยงError has cause
?
function(){
var error = new Error('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
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function(){
var error = new Error('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงError.prototype lacks cause
?
function(){
return !('cause' in Error.prototype);
}
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function(){
return !('cause' in Error.prototype);
}
ยงEvalError has cause
?
function(){
var error = new EvalError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
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function(){
var error = new EvalError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงEvalError.prototype lacks cause
?
function(){
return !('cause' in EvalError.prototype);
}
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function(){
return !('cause' in EvalError.prototype);
}
ยงRangeError has cause
?
function(){
var error = new RangeError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
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function(){
var error = new RangeError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงRangeError.prototype lacks cause
?
function(){
return !('cause' in RangeError.prototype);
}
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function(){
return !('cause' in RangeError.prototype);
}
ยงReferenceError has cause
?
function(){
var error = new ReferenceError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
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function(){
var error = new ReferenceError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงReferenceError.prototype lacks cause
?
function(){
return !('cause' in ReferenceError.prototype);
}
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function(){
return !('cause' in ReferenceError.prototype);
}
ยงSyntaxError has cause
?
function(){
var error = new SyntaxError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
Yes
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function(){
var error = new SyntaxError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงSyntaxError.prototype lacks cause
?
function(){
return !('cause' in SyntaxError.prototype);
}
Yes
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function(){
return !('cause' in SyntaxError.prototype);
}
ยงTypeError has cause
?
function(){
var error = new TypeError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
Yes
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function(){
var error = new TypeError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงTypeError.prototype lacks cause
?
function(){
return !('cause' in TypeError.prototype);
}
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return !('cause' in TypeError.prototype);
}
ยงURIError has cause
?
function(){
var error = new URIError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
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No
No
No
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No
No
No
No
No
No
No
No
function(){
var error = new URIError('error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงURIError.prototype lacks cause
?
function(){
return !('cause' in URIError.prototype);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
function(){
return !('cause' in URIError.prototype);
}
ยงAggregateError has cause
?
function(){
var error = new AggregateError([], 'error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Flag
No
No
No
No
No
No
No
No
Error
No
Error
No
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var error = new AggregateError([], 'error', { cause: 'cause' }) return error.hasOwnProperty('cause') && error.cause === 'cause';
}
ยงAggregateError.prototype lacks cause
?
function(){
return !('cause' in AggregateError.prototype);
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
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Error
Error
Error
Error
Error
function(){
return !('cause' in AggregateError.prototype);
}

RegExp Match Indices (`hasIndices` / `d` flag)

ยงconstructor supports it
?
function(){
return new RegExp('a', 'd') instanceof RegExp;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
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Error
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Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return new RegExp('a', 'd') instanceof RegExp;
}
ยงshows up in flags
?
function(){
var expected = ['hasIndices']; // Sorted alphabetically by shortname as of ES2022 โ€“ "dgimsuy". // Any flags introduced after ES2022 will be ignored by this test. if ('global' in RegExp.prototype) expected.push('global'); if ('ignoreCase' in RegExp.prototype) expected.push('ignoreCase'); if ('multiline' in RegExp.prototype) expected.push('multiline'); if ('dotAll' in RegExp.prototype) expected.push('dotAll'); if ('unicode' in RegExp.prototype) expected.push('unicode'); if ('sticky' in RegExp.prototype) expected.push('sticky'); var actual = []; var p = new Proxy({}, { get: function (o, k) { actual.push(k); return o[k]; }}); Object.getOwnPropertyDescriptor(RegExp.prototype, 'flags').get.call(p); var i = 0; for (var j = 0; i < expected.length && j < actual.length; i++, j++) { if (expected[i] !== actual[j]) j++; } return i === expected.length;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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No
No
No
No
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var expected = ['hasIndices']; // Sorted alphabetically by shortname as of ES2022 โ€“ "dgimsuy". // Any flags introduced after ES2022 will be ignored by this test. if ('global' in RegExp.prototype) expected.push('global'); if ('ignoreCase' in RegExp.prototype) expected.push('ignoreCase'); if ('multiline' in RegExp.prototype) expected.push('multiline'); if ('dotAll' in RegExp.prototype) expected.push('dotAll'); if ('unicode' in RegExp.prototype) expected.push('unicode'); if ('sticky' in RegExp.prototype) expected.push('sticky'); var actual = []; var p = new Proxy({}, { get: function (o, k) { actual.push(k); return o[k]; }}); Object.getOwnPropertyDescriptor(RegExp.prototype, 'flags').get.call(p); var i = 0; for (var j = 0; i < expected.length && j < actual.length; i++, j++) { if (expected[i] !== actual[j]) j++; } return i === expected.length;
}

Node.js ES2023 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
100% complete100% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
100% complete100% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
100% complete100% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
100% complete100% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
100% complete100% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
100% complete100% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
100% complete100% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
100% complete100% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
100% complete100% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
100% complete30% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
30% complete30% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
30% complete30% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
30% complete30% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
30% complete30% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
30% complete30% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
10% complete10% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
10% complete10% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
10% complete10% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
10% complete10% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
10% complete10% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
10% complete10% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
10% complete10% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
10% complete10% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
10% complete10% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
10% complete10% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
10% complete10% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
10% complete10% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
10% complete10% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
10% complete10% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
10% complete10% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
10% complete10% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
10% complete10% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
10% complete10% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
10% complete10% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
10% complete10% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
0% complete0% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
0% complete0% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
0% complete0% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
0% complete0% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
0% complete0% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
0% complete0% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
0% complete0% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
0% complete0% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
0% complete0% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
0% complete0% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
0% complete0% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
0% complete0% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
0% complete0% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
0% complete0% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
0% complete0% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
0% complete0% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
0% complete0% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
0% complete0% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
0% complete0% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
0% complete0% complete

features

Array find from last

ยงArray.prototype.findLast
?
function(){
var arr = [{ x: 1 }, { x: 2 }, { x: 1 }, { x: 2 }]; return arr.findLast(function (o) { return o.x === 1; }) === arr[2];
}
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Error
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function(){
var arr = [{ x: 1 }, { x: 2 }, { x: 1 }, { x: 2 }]; return arr.findLast(function (o) { return o.x === 1; }) === arr[2];
}
ยงArray.prototype.findLastIndex
?
function(){
var arr = [{ x: 1 }, { x: 2 }, { x: 1 }, { x: 2 }]; return arr.findLastIndex(function (o) { return o.x === 1; }) === 2;
}
Yes
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function(){
var arr = [{ x: 1 }, { x: 2 }, { x: 1 }, { x: 2 }]; return arr.findLastIndex(function (o) { return o.x === 1; }) === 2;
}

ยงHashbang Grammar
?
function(){
try { return !eval('#!/wash/your/hands'); } catch (e) { return false }
}
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function(){
try { return !eval('#!/wash/your/hands'); } catch (e) { return false }
}

Change Array by copy

ยงArray.prototype.toReversed()
?
function(){
var arr = [1, 2, 3]; return arr.toReversed()[0] === 3 && arr[0] === 1;
}
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function(){
var arr = [1, 2, 3]; return arr.toReversed()[0] === 3 && arr[0] === 1;
}
ยงArray.prototype.toSorted()
?
function(){
var arr = ['C', 'A', 'B']; return arr.toSorted()[0] === 'A' && arr[0] === 'C';
}
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function(){
var arr = ['C', 'A', 'B']; return arr.toSorted()[0] === 'A' && arr[0] === 'C';
}
ยงArray.prototype.toSpliced()
?
function(){
var arr = ['A', 'C']; return arr.toSpliced(1, 0, 'B')[1] === 'B' && arr[1] === 'C';
}
Yes
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function(){
var arr = ['A', 'C']; return arr.toSpliced(1, 0, 'B')[1] === 'B' && arr[1] === 'C';
}
ยงArray.prototype.with()
?
function(){
var arr = ['A', 'X', 'C']; return arr.with(1, 'B')[1] === 'B' && arr[1] === 'X';
}
Yes
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function(){
var arr = ['A', 'X', 'C']; return arr.with(1, 'B')[1] === 'B' && arr[1] === 'X';
}
ยงTypedArray.prototype.toReversed()
?
function(){
var arr = new Uint8Array([1, 2, 3]); return arr.toReversed()[0] == 3 && arr[0] == 1;
}
Yes
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function(){
var arr = new Uint8Array([1, 2, 3]); return arr.toReversed()[0] == 3 && arr[0] == 1;
}
ยงTypedArray.prototype.toSorted()
?
function(){
var arr = new Uint8Array([3, 1, 2]); return arr.toSorted()[0] == 1 && arr[0] == 3;
}
Yes
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function(){
var arr = new Uint8Array([3, 1, 2]); return arr.toSorted()[0] == 1 && arr[0] == 3;
}
ยงTypedArray.prototype.with()
?
function(){
var arr = new Uint8Array([1, 0, 2]); return arr.with(1, 2)[1] == 2 && arr[1] == 0;
}
Yes
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function(){
var arr = new Uint8Array([1, 0, 2]); return arr.with(1, 2)[1] == 2 && arr[1] == 0;
}

Node.js ES2024 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!92% complete92% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
92% complete92% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
92% complete92% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
92% complete92% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
84% complete84% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
92% complete92% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
84% complete84% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
84% complete76% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
76% complete69% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
69% complete46% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
61% complete38% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
53% complete30% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
7% complete0% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
7% complete0% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
7% complete0% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
0% complete0% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
0% complete0% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
0% complete0% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
0% complete0% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
0% complete0% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
0% complete0% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
0% complete0% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
0% complete0% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
0% complete0% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
0% complete0% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
0% complete0% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
0% complete0% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
0% complete0% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
0% complete0% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
0% complete0% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
0% complete0% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
0% complete0% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
0% complete0% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
0% complete0% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
0% complete0% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
0% complete0% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
0% complete0% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
0% complete0% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
0% complete0% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
0% complete0% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
0% complete0% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
0% complete0% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
0% complete0% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
0% complete0% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
0% complete0% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
0% complete0% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
0% complete0% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
0% complete0% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
0% complete0% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
0% complete0% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
0% complete0% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
0% complete0% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
0% complete0% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
0% complete0% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
0% complete0% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
0% complete0% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
0% complete0% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
0% complete0% complete

features

RegExp `v` flag

ยงset notations
?
function(){
return /[\p{ASCII}&&\p{Decimal_Number}]/v.test("0") && /[\p{Any}--[\x01-\u{10ffff}]]/v.test("\0")
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
Error
function(){
return /[\p{ASCII}&&\p{Decimal_Number}]/v.test("0") && /[\p{Any}--[\x01-\u{10ffff}]]/v.test("\0")
}
ยงproperties of Strings
?
function(){
return /^\p{Emoji_Keycap_Sequence}$/v.test("*\uFE0F\u20E3") && !/^\p{Emoji_Keycap_Sequence}$/v.test("*");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
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Error
Error
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Error
function(){
return /^\p{Emoji_Keycap_Sequence}$/v.test("*\uFE0F\u20E3") && !/^\p{Emoji_Keycap_Sequence}$/v.test("*");
}
ยงconstructor supports it
?
function(){
return new RegExp('a', 'v') instanceof RegExp;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
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Error
function(){
return new RegExp('a', 'v') instanceof RegExp;
}
ยงshows up in flags
?
function(){
var flags = []; var p = new Proxy({}, { get: function (o, k) { flags.push(k); return o[k]; }}); Object.getOwnPropertyDescriptor(RegExp.prototype, 'flags').get.call(p); return flags.indexOf("unicodeSets") !== -1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
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Error
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Error
function(){
var flags = []; var p = new Proxy({}, { get: function (o, k) { flags.push(k); return o[k]; }}); Object.getOwnPropertyDescriptor(RegExp.prototype, 'flags').get.call(p); return flags.indexOf("unicodeSets") !== -1;
}
ยงUnicode 15.1
?
function(){
return /^\p{RGI_Emoji}$/v.test("๐Ÿฆโ€๐Ÿ”ฅ");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
No
No
Error
Error
Error
Error
Error
Error
Error
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Error
function(){
return /^\p{RGI_Emoji}$/v.test("๐Ÿฆโ€๐Ÿ”ฅ");
}
ยงUnicode 16.0
?
function(){
return /^\p{RGI_Emoji}$/v.test("๐Ÿ‡จ๐Ÿ‡ถ");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
No
No
No
No
No
No
Yes
Yes
No
No
No
No
Error
Error
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Error
function(){
return /^\p{RGI_Emoji}$/v.test("๐Ÿ‡จ๐Ÿ‡ถ");
}
ยงUnicode 17.0
?
function(){
return /^\p{RGI_Emoji}$/v.test("๐Ÿง‘โ€๐Ÿฉฐโ€๐Ÿฝ");
}
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Error
Error
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Error
function(){
return /^\p{RGI_Emoji}$/v.test("๐Ÿง‘โ€๐Ÿฉฐโ€๐Ÿฝ");
}

ArrayBuffer.prototype.transfer

ยงArrayBuffer.prototype.transfer()
?
function(){
const buffer1 = new Uint8Array([1, 2]).buffer; const buffer2 = buffer1.transfer(); return buffer1.byteLength === 0 && buffer2.byteLength === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
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Error
function(){
const buffer1 = new Uint8Array([1, 2]).buffer; const buffer2 = buffer1.transfer(); return buffer1.byteLength === 0 && buffer2.byteLength === 2;
}
ยงArrayBuffer.prototype.transferToFixedLength()
?
function(){
const buffer1 = new Uint8Array([1, 2]).buffer; const buffer2 = buffer1.transferToFixedLength(); return buffer1.byteLength === 0 && buffer2.byteLength === 2;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Flag
Error
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Error
Error
Error
function(){
const buffer1 = new Uint8Array([1, 2]).buffer; const buffer2 = buffer1.transferToFixedLength(); return buffer1.byteLength === 0 && buffer2.byteLength === 2;
}
ยงArrayBuffer.prototype.detached
?
function(){
const buffer1 = new Uint8Array([1, 2]).buffer; const buffer2 = buffer1.transfer(); return buffer1.detached && !buffer2.detached;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Flag
Error
No
Error
No
Error
No
Error
Error
Error
Error
Error
Error
Error
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Error
Error
Error
Error
Error
function(){
const buffer1 = new Uint8Array([1, 2]).buffer; const buffer2 = buffer1.transfer(); return buffer1.detached && !buffer2.detached;
}

ยงPromise.withResolvers
?
function(){
var obj = Promise.withResolvers(); return obj instanceof Object && obj.promise instanceof Promise && typeof obj.resolve === 'function' && typeof obj.reject === 'function';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
var obj = Promise.withResolvers(); return obj instanceof Object && obj.promise instanceof Promise && typeof obj.resolve === 'function' && typeof obj.reject === 'function';
}

Array Grouping

ยงObject.groupBy()
?
function(){
const array = [1, 2, 3, 4]; const obj = Object.groupBy(array, (num, index) => { return num % 2 === 0 ? 'even': 'odd'; }); return !('toString' in obj) && obj.even[0] == 2 && obj.odd[0] == 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
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Error
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Error
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Error
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Error
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Error
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Error
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Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
const array = [1, 2, 3, 4]; const obj = Object.groupBy(array, (num, index) => { return num % 2 === 0 ? 'even': 'odd'; }); return !('toString' in obj) && obj.even[0] == 2 && obj.odd[0] == 1;
}
ยงMap.groupBy()
?
function(){
const array = [1, 2, 3, 4]; const odd = { odd: true }; const even = { even: true }; const map = Map.groupBy(array, (num, index) => { return num % 2 === 0 ? even: odd; }); return map instanceof Map && map.get(even)[0] === 2 && map.get(odd)[0] === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
Error
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Error
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Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
const array = [1, 2, 3, 4]; const odd = { odd: true }; const even = { even: true }; const map = Map.groupBy(array, (num, index) => { return num % 2 === 0 ? even: odd; }); return map instanceof Map && map.get(even)[0] === 2 && map.get(odd)[0] === 1;
}

Node.js ES2025 Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!100% complete100% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
100% complete100% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
100% complete100% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
96% complete96% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
96% complete96% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
93% complete79% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
93% complete79% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
79% complete0% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
79% complete0% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
0% complete0% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
0% complete0% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
0% complete0% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
0% complete0% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
0% complete0% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
0% complete0% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
0% complete0% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
0% complete0% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
0% complete0% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
0% complete0% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
0% complete0% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
0% complete0% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
0% complete0% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
0% complete0% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
0% complete0% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
0% complete0% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
0% complete0% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
0% complete0% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
0% complete0% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
0% complete0% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
0% complete0% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
0% complete0% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
0% complete0% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
0% complete0% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
0% complete0% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
0% complete0% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
0% complete0% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
0% complete0% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
0% complete0% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
0% complete0% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
0% complete0% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
0% complete0% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
0% complete0% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
0% complete0% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
0% complete0% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
0% complete0% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
0% complete0% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
0% complete0% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
0% complete0% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
0% complete0% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
0% complete0% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
0% complete0% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
0% complete0% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
0% complete0% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
0% complete0% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
0% complete0% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
0% complete0% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
0% complete0% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
0% complete0% complete

features

ยงDuplicate named capturing groups
?
function(){
return /(?<year>[0-9]{4})-[0-9]{2}|[0-9]{2}-(?<year>[0-9]{4})/.test("12-1995");
}
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function(){
return /(?<year>[0-9]{4})-[0-9]{2}|[0-9]{2}-(?<year>[0-9]{4})/.test("12-1995");
}
ยงPromise.try
?
function(){
if (!('try' in Promise)) { return false; } var called = false; var argsMatch = false; var p = Promise.try(function () { called = true; }) var p2 = Promise.try(function () { 'use strict'; argsMatch = this === undefined && arguments.length === 2 && arguments[0] === p && arguments[1] === 2; }, p, 2); if (!(p instanceof Promise) || !(p2 instanceof Promise)) { return false; } p2.then(function () { if (!called || !argsMatch) { return; } asyncTestPassed(); });
}
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function(){
if (!('try' in Promise)) { return false; } var called = false; var argsMatch = false; var p = Promise.try(function () { called = true; }) var p2 = Promise.try(function () { 'use strict'; argsMatch = this === undefined && arguments.length === 2 && arguments[0] === p && arguments[1] === 2; }, p, 2); if (!(p instanceof Promise) || !(p2 instanceof Promise)) { return false; } p2.then(function () { if (!called || !argsMatch) { return; } asyncTestPassed(); });
}
ยงRegExp Escaping
?
function(){
return RegExp.escape("The Quick Brown Fox") === "\\x54he\\x20Quick\\x20Brown\\x20Fox" && RegExp.escape("(*.*)") === "\\(\\*\\.\\*\\)" && RegExp.escape("๏ฝก^๏ฝฅ๏ฝช๏ฝฅ^๏ฝก") === "๏ฝก\\^๏ฝฅ๏ฝช๏ฝฅ\\^๏ฝก" && RegExp.escape("\\d \\D (?:)") === "\\\\d\\x20\\\\D\\x20\\(\\?\\x3a\\)";
}
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function(){
return RegExp.escape("The Quick Brown Fox") === "\\x54he\\x20Quick\\x20Brown\\x20Fox" && RegExp.escape("(*.*)") === "\\(\\*\\.\\*\\)" && RegExp.escape("๏ฝก^๏ฝฅ๏ฝช๏ฝฅ^๏ฝก") === "๏ฝก\\^๏ฝฅ๏ฝช๏ฝฅ\\^๏ฝก" && RegExp.escape("\\d \\D (?:)") === "\\\\d\\x20\\\\D\\x20\\(\\?\\x3a\\)";
}

Set methods

ยงSet.prototype.intersection()
?
function(){
var set = new Set([1, 2, 3]).intersection(new Set([2, 3, 4])); return set.size === 2 && set.has(2) && set.has(3);
}
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function(){
var set = new Set([1, 2, 3]).intersection(new Set([2, 3, 4])); return set.size === 2 && set.has(2) && set.has(3);
}
ยงSet.prototype.union()
?
function(){
var set = new Set([1, 2]).union(new Set([2, 3])); return set.size === 3 && set.has(1) && set.has(2) && set.has(3);
}
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function(){
var set = new Set([1, 2]).union(new Set([2, 3])); return set.size === 3 && set.has(1) && set.has(2) && set.has(3);
}
ยงSet.prototype.difference()
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function(){
var set = new Set([1, 2, 3]).difference(new Set([3, 4])); return set.size === 2 && set.has(1) && set.has(2);
}
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function(){
var set = new Set([1, 2, 3]).difference(new Set([3, 4])); return set.size === 2 && set.has(1) && set.has(2);
}
ยงSet.prototype.symmetricDifference()
?
function(){
var set = new Set([1, 2]).symmetricDifference(new Set([2, 3])); return set.size === 2 && set.has(1) && set.has(3);
}
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function(){
var set = new Set([1, 2]).symmetricDifference(new Set([2, 3])); return set.size === 2 && set.has(1) && set.has(3);
}
ยงSet.prototype.isDisjointFrom()
?
function(){
return new Set([1, 2, 3]).isDisjointFrom(new Set([4, 5, 6]));
}
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function(){
return new Set([1, 2, 3]).isDisjointFrom(new Set([4, 5, 6]));
}
ยงSet.prototype.isSubsetOf()
?
function(){
return new Set([1, 2, 3]).isSubsetOf(new Set([5, 4, 3, 2, 1]));
}
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function(){
return new Set([1, 2, 3]).isSubsetOf(new Set([5, 4, 3, 2, 1]));
}
ยงSet.prototype.isSupersetOf()
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function(){
return new Set([5, 4, 3, 2, 1]).isSupersetOf(new Set([1, 2, 3]));
}
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function(){
return new Set([5, 4, 3, 2, 1]).isSupersetOf(new Set([1, 2, 3]));
}

RegExp Pattern Modifiers

ยงi flag
?
function(){
const regex = /^[a-z](?-i:[a-z])$/i; return regex.test("ab") && regex.test("Ab") && !regex.test("aB");
}
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function(){
const regex = /^[a-z](?-i:[a-z])$/i; return regex.test("ab") && regex.test("Ab") && !regex.test("aB");
}
ยงm flag
?
function(){
const regex = /^a|(?m:^b)/; return regex.test("a") && regex.test("b") && regex.test("c\nb") && !regex.test("c\na");
}
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function(){
const regex = /^a|(?m:^b)/; return regex.test("a") && regex.test("b") && regex.test("c\nb") && !regex.test("c\na");
}
ยงs flag
?
function(){
const regex = /.(?-s:.)/s; return regex.test("\na") && regex.test("aa") && !regex.test("\n\n");
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
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Error
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Error
Error
function(){
const regex = /.(?-s:.)/s; return regex.test("\na") && regex.test("aa") && !regex.test("\n\n");
}

Iterator Helpers

ยงinstanceof Iterator
?
function(){
return [1, 2, 3].values() instanceof Iterator;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
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Error
Error
Error
function(){
return [1, 2, 3].values() instanceof Iterator;
}
ยงextends Iterator
?
function(){
class Class extends Iterator { } const instance = new Class(); return instance[Symbol.iterator]() === instance;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
class Class extends Iterator { } const instance = new Class(); return instance[Symbol.iterator]() === instance;
}
ยงIterator.from, iterable
?
function(){
const iterator = Iterator.from([1, 2, 3]); return 'next' in iterator && iterator instanceof Iterator && Array.from(iterator).join() === '1,2,3';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
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Error
Error
function(){
const iterator = Iterator.from([1, 2, 3]); return 'next' in iterator && iterator instanceof Iterator && Array.from(iterator).join() === '1,2,3';
}
ยงIterator.from, iterator
?
function(){
const iterator = Iterator.from({ i: 0, next() { return { value: ++this.i, done: this.i > 3 }; } }); return 'next' in iterator && iterator instanceof Iterator && Array.from(iterator).join() === '1,2,3';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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function(){
const iterator = Iterator.from({ i: 0, next() { return { value: ++this.i, done: this.i > 3 }; } }); return 'next' in iterator && iterator instanceof Iterator && Array.from(iterator).join() === '1,2,3';
}
ยงIterator.prototype.drop
?
function(){
return Array.from([1, 2, 3].values().drop(1)).join() === '2,3';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
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Error
function(){
return Array.from([1, 2, 3].values().drop(1)).join() === '2,3';
}
ยงIterator.prototype.every
?
function(){
return [1, 2, 3].values().every(it => typeof it === 'number');
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
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function(){
return [1, 2, 3].values().every(it => typeof it === 'number');
}
ยงIterator.prototype.filter
?
function(){
return Array.from([1, 2, 3].values().filter(it => it % 2)).join() === '1,3';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
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Error
function(){
return Array.from([1, 2, 3].values().filter(it => it % 2)).join() === '1,3';
}
ยงIterator.prototype.find
?
function(){
return [1, 2, 3].values().find(it => it % 2) === 1;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
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Error
Error
Error
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Error
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Error
function(){
return [1, 2, 3].values().find(it => it % 2) === 1;
}
ยงIterator.prototype.flatMap
?
function(){
return Array.from([1, 2, 3].values().flatMap(it => [it, 0])).join() === '1,0,2,0,3,0';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
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Error
Error
Error
Error
Error
Error
function(){
return Array.from([1, 2, 3].values().flatMap(it => [it, 0])).join() === '1,0,2,0,3,0';
}
ยงIterator.prototype.forEach
?
function(){
let result = ''; [1, 2, 3].values().forEach(it => result += it); return result === '123';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
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Error
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
let result = ''; [1, 2, 3].values().forEach(it => result += it); return result === '123';
}
ยงIterator.prototype.map
?
function(){
return Array.from([1, 2, 3].values().map(it => it * it)).join() === '1,4,9';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
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Error
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Error
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Error
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Error
Error
Error
Error
Error
function(){
return Array.from([1, 2, 3].values().map(it => it * it)).join() === '1,4,9';
}
ยงIterator.prototype.reduce
?
function(){
return [1, 2, 3].values().reduce((a, b) => a + b) === 6;
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
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Error
Error
Error
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Error
Error
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Error
function(){
return [1, 2, 3].values().reduce((a, b) => a + b) === 6;
}
ยงIterator.prototype.some
?
function(){
return [1, 2, 3].values().some(it => typeof it === 'number');
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
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Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return [1, 2, 3].values().some(it => typeof it === 'number');
}
ยงIterator.prototype.take
?
function(){
return Array.from([1, 2, 3].values().take(2)).join() === '1,2';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
Error
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Error
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Error
Error
Error
Error
Error
Error
Error
Error
function(){
return Array.from([1, 2, 3].values().take(2)).join() === '1,2';
}
ยงIterator.prototype.toArray
?
function(){
const array = [1, 2, 3].values().toArray(); return Array.isArray(array) && array.join() === '1,2,3';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
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Error
Error
Error
Error
Error
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Error
Error
Error
Error
Error
Error
function(){
const array = [1, 2, 3].values().toArray(); return Array.isArray(array) && array.join() === '1,2,3';
}
ยงIterator.prototype[@@toStringTag]
?
function(){
return Iterator.prototype[Symbol.toStringTag] === 'Iterator';
}
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Error
Flag
Error
Flag
Error
Error
Error
Error
Error
Error
Error
Error
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Error
Error
Error
Error
Error
Error
Error
Error
Error
function(){
return Iterator.prototype[Symbol.toStringTag] === 'Iterator';
}

Node.js ESNEXT Support

26.0.0
(these versions have identical results)
nightly v8 14.2.231.17-node.11
Nightly!35% complete35% complete 		25.2.0
(these versions have identical results)
25.2.0 v8 14.1.146.11-node.13
25.1.0 v8 14.1.146.11-node.11
25.0.0 v8 14.1.146.11-node.10
35% complete35% complete 		24.11.1
(these versions have identical results)
24.11.1 v8 13.6.233.10-node.28
24.11.0 v8 13.6.233.10-node.28
24.10.0 v8 13.6.233.10-node.28
24.9.0 v8 13.6.233.10-node.27
24.8.0 v8 13.6.233.10-node.27
24.7.0 v8 13.6.233.10-node.26
24.6.0 v8 13.6.233.10-node.24
24.5.0 v8 13.6.233.10-node.21
24.4.1 v8 13.6.233.10-node.17
24.4.0 v8 13.6.233.10-node.17
24.3.0 v8 13.6.233.10-node.18
24.2.0 v8 13.6.233.10-node.17
24.1.0 v8 13.6.233.10-node.16
24.0.2 v8 13.6.233.8-node.10
24.0.1 v8 13.6.233.8-node.10
24.0.0 v8 13.6.233.8-node.10
21% complete21% complete 		23.11.1
(these versions have identical results)
23.11.1 v8 12.9.202.28-node.14
23.11.0 v8 12.9.202.28-node.14
23.10.0 v8 12.9.202.28-node.13
23.9.0 v8 12.9.202.28-node.13
23.8.0 v8 12.9.202.28-node.13
23.7.0 v8 12.9.202.28-node.12
23.6.1 v8 12.9.202.28-node.12
23.6.0 v8 12.9.202.28-node.12
23.5.0 v8 12.9.202.28-node.12
23.4.0 v8 12.9.202.28-node.11
23.3.0 v8 12.9.202.28-node.11
4% complete4% complete 		23.2.0
(these versions have identical results)
23.2.0 v8 12.9.202.28-node.11
23.1.0 v8 12.9.202.28-node.11
23.0.0 v8 12.9.202.26-node.10
4% complete4% complete 		22.21.1
(these versions have identical results)
22.21.1 v8 12.4.254.21-node.33
22.21.0 v8 12.4.254.21-node.33
22.20.0 v8 12.4.254.21-node.33
22.19.0 v8 12.4.254.21-node.29
22.18.0 v8 12.4.254.21-node.27
22.17.1 v8 12.4.254.21-node.27
22.17.0 v8 12.4.254.21-node.26
22.16.0 v8 12.4.254.21-node.26
22.15.1 v8 12.4.254.21-node.24
22.15.0 v8 12.4.254.21-node.24
22.14.0 v8 12.4.254.21-node.22
22.13.1 v8 12.4.254.21-node.22
22.13.0 v8 12.4.254.21-node.22
22.12.0 v8 12.4.254.21-node.21
4% complete4% complete 		22.11.0
(these versions have identical results)
22.11.0 v8 12.4.254.21-node.21
22.10.0 v8 12.4.254.21-node.21
22.9.0 v8 12.4.254.21-node.19
22.8.0 v8 12.4.254.21-node.19
22.7.0 v8 12.4.254.21-node.18
22.6.0 v8 12.4.254.21-node.18
22.5.1 v8 12.4.254.21-node.16
22.5.0 v8 12.4.254.21-node.16
22.4.1 v8 12.4.254.21-node.15
22.4.0 v8 12.4.254.21-node.15
22.3.0 v8 12.4.254.20-node.13
22.2.0 v8 12.4.254.14-node.12
22.1.0 v8 12.4.254.14-node.11
22.0.0 v8 12.4.254.14-node.10
4% complete4% complete 		21.7.3
(these versions have identical results)
21.7.3 v8 11.8.172.17-node.20
21.7.2 v8 11.8.172.17-node.20
21.7.1 v8 11.8.172.17-node.20
21.7.0 v8 11.8.172.17-node.20
21.6.2 v8 11.8.172.17-node.19
21.6.1 v8 11.8.172.17-node.19
21.6.0 v8 11.8.172.17-node.19
21.5.0 v8 11.8.172.17-node.18
21.4.0 v8 11.8.172.17-node.17
21.3.0 v8 11.8.172.17-node.17
4% complete4% complete 		21.2.0
(these versions have identical results)
21.2.0 v8 11.8.172.17-node.15
21.1.0 v8 11.8.172.15-node.14
21.0.0 v8 11.8.172.13-node.12
4% complete4% complete 		20.19.5
(these versions have identical results)
20.19.5 v8 11.3.244.8-node.30
20.19.4 v8 11.3.244.8-node.29
20.19.3 v8 11.3.244.8-node.29
20.19.2 v8 11.3.244.8-node.26
20.19.1 v8 11.3.244.8-node.26
20.19.0 v8 11.3.244.8-node.26
4% complete4% complete 		20.18.3
(these versions have identical results)
20.18.3 v8 11.3.244.8-node.25
20.18.2 v8 11.3.244.8-node.23
20.18.1 v8 11.3.244.8-node.23
20.18.0 v8 11.3.244.8-node.23
20.17.0 v8 11.3.244.8-node.23
20.16.0 v8 11.3.244.8-node.23
20.15.1 v8 11.3.244.8-node.23
20.15.0 v8 11.3.244.8-node.23
20.14.0 v8 11.3.244.8-node.23
20.13.1 v8 11.3.244.8-node.20
20.13.0 v8 11.3.244.8-node.20
20.12.2 v8 11.3.244.8-node.19
20.12.1 v8 11.3.244.8-node.19
20.12.0 v8 11.3.244.8-node.19
4% complete4% complete 		20.11.1
(these versions have identical results)
20.11.1 v8 11.3.244.8-node.17
20.11.0 v8 11.3.244.8-node.17
20.10.0 v8 11.3.244.8-node.25
20.9.0 v8 11.3.244.8-node.16
20.8.1 v8 11.3.244.8-node.16
20.8.0 v8 11.3.244.8-node.16
20.7.0 v8 11.3.244.8-node.15
20.6.1 v8 11.3.244.8-node.14
20.6.0 v8 11.3.244.8-node.14
20.5.1 v8 11.3.244.8-node.10
20.5.0 v8 11.3.244.8-node.10
20.4.0 v8 11.3.244.8-node.10
20.3.1 v8 11.3.244.8-node.9
20.3.0 v8 11.3.244.8-node.9
20.2.0 v8 11.3.244.8-node.9
20.1.0 v8 11.3.244.8-node.6
20.0.0 v8 11.3.244.4-node.3
4% complete4% complete 		19.9.0
(these versions have identical results)
19.9.0 v8 10.8.168.25-node.16
19.8.1 v8 10.8.168.25-node.12
19.8.0 v8 10.8.168.25-node.12
19.7.0 v8 10.8.168.25-node.11
19.6.1 v8 10.8.168.25-node.11
19.6.0 v8 10.8.168.25-node.11
19.5.0 v8 10.8.168.25-node.11
19.4.0 v8 10.8.168.25-node.11
19.3.0 v8 10.8.168.21-node.8
19.2.0 v8 10.8.168.20-node.8
4% complete4% complete 		19.1.0
(these versions have identical results)
19.1.0 v8 10.7.193.20-node.19
4% complete4% complete 		19.0.1
(these versions have identical results)
19.0.1 v8 10.7.193.13-node.16
19.0.0 v8 10.7.193.13-node.16
4% complete4% complete 		18.20.8
(these versions have identical results)
18.20.8 v8 10.2.154.26-node.39
18.20.7 v8 10.2.154.26-node.39
18.20.6 v8 10.2.154.26-node.37
18.20.5 v8 10.2.154.26-node.37
18.20.4 v8 10.2.154.26-node.37
18.20.3 v8 10.2.154.26-node.37
18.20.2 v8 10.2.154.26-node.36
18.20.1 v8 10.2.154.26-node.36
18.20.0 v8 10.2.154.26-node.36
4% complete4% complete 		18.19.1
(these versions have identical results)
18.19.1 v8 10.2.154.26-node.28
18.19.0 v8 10.2.154.26-node.28
18.18.2 v8 10.2.154.26-node.26
18.18.1 v8 10.2.154.26-node.26
18.18.0 v8 10.2.154.26-node.26
18.17.1 v8 10.2.154.26-node.26
18.17.0 v8 10.2.154.26-node.26
18.16.1 v8 10.2.154.26-node.26
18.16.0 v8 10.2.154.26-node.26
18.15.0 v8 10.2.154.26-node.25
18.14.2 v8 10.2.154.26-node.22
18.14.1 v8 10.2.154.23-node.22
18.14.0 v8 10.2.154.23-node.22
18.13.0 v8 10.2.154.23-node.21
4% complete4% complete 		18.12.1
(these versions have identical results)
18.12.1 v8 10.2.154.15-node.12
18.12.0 v8 10.2.154.15-node.12
18.11.0 v8 10.2.154.15-node.12
18.10.0 v8 10.2.154.15-node.12
18.9.1 v8 10.2.154.15-node.12
18.9.0 v8 10.2.154.15-node.12
18.8.0 v8 10.2.154.13-node.11
18.7.0 v8 10.2.154.13-node.9
18.6.0 v8 10.2.154.13-node.8
18.5.0 v8 10.2.154.4-node.8
18.4.0 v8 10.2.154.4-node.8
18.3.0 v8 10.2.154.4-node.8
18.2.0 v8 10.1.124.8-node.13
18.1.0 v8 10.1.124.8-node.13
18.0.0 v8 10.1.124.8-node.13
4% complete4% complete 		17.9.1
(these versions have identical results)
17.9.1 v8 9.6.180.15-node.16
17.9.0 v8 9.6.180.15-node.16
17.8.0 v8 9.6.180.15-node.16
17.7.2 v8 9.6.180.15-node.15
17.7.1 v8 9.6.180.15-node.15
17.7.0 v8 9.6.180.15-node.15
17.6.0 v8 9.6.180.15-node.13
17.5.0 v8 9.6.180.15-node.13
17.4.0 v8 9.6.180.15-node.13
17.3.1 v8 9.6.180.15-node.12
17.3.0 v8 9.6.180.15-node.12
17.2.0 v8 9.6.180.14-node.12
4% complete4% complete 		17.1.0
(these versions have identical results)
17.1.0 v8 9.5.172.25-node.13
17.0.1 v8 9.5.172.21-node.12
17.0.0 v8 9.5.172.21-node.12
4% complete4% complete 		16.20.2
(these versions have identical results)
16.20.2 v8 9.4.146.26-node.26
16.20.1 v8 9.4.146.26-node.26
16.20.0 v8 9.4.146.26-node.26
16.19.1 v8 9.4.146.26-node.24
16.19.0 v8 9.4.146.26-node.24
16.18.1 v8 9.4.146.26-node.22
16.18.0 v8 9.4.146.26-node.22
16.17.1 v8 9.4.146.26-node.22
16.17.0 v8 9.4.146.26-node.22
16.16.0 v8 9.4.146.24-node.21
16.15.1 v8 9.4.146.24-node.21
16.15.0 v8 9.4.146.24-node.20
16.14.2 v8 9.4.146.24-node.20
16.14.1 v8 9.4.146.24-node.20
16.14.0 v8 9.4.146.24-node.20
4% complete4% complete 		16.13.2
(these versions have identical results)
16.13.2 v8 9.4.146.24-node.14
16.13.1 v8 9.4.146.24-node.14
16.13.0 v8 9.4.146.19-node.13
16.12.0 v8 9.4.146.19-node.13
16.11.1 v8 9.4.146.19-node.13
16.11.0 v8 9.4.146.19-node.13
4% complete4% complete 		16.10.0
(these versions have identical results)
16.10.0 v8 9.3.345.19-node.14
16.9.1 v8 9.3.345.16-node.12
16.9.0 v8 9.3.345.16-node.11
4% complete4% complete 		16.8.0
(these versions have identical results)
16.8.0 v8 9.2.230.21-node.20
16.7.0 v8 9.2.230.21-node.19
16.6.2 v8 9.2.230.21-node.19
16.6.1 v8 9.2.230.21-node.19
16.6.0 v8 9.2.230.21-node.18
4% complete4% complete 		16.5.0
(these versions have identical results)
16.5.0 v8 9.1.269.38-node.20
16.4.2 v8 9.1.269.36-node.14
16.4.1 v8 9.1.269.36-node.14
16.4.0 v8 9.1.269.36-node.14
4% complete4% complete 		16.3.0
(these versions have identical results)
16.3.0 v8 9.0.257.25-node.16
16.2.0 v8 9.0.257.25-node.16
16.1.0 v8 9.0.257.24-node.11
4% complete4% complete 		16.0.0
(these versions have identical results)
16.0.0 v8 9.0.257.17-node.10
4% complete4% complete 		15.14.0
(these versions have identical results)
15.14.0 v8 8.6.395.17-node.28
15.13.0 v8 8.6.395.17-node.28
15.12.0 v8 8.6.395.17-node.27
15.11.0 v8 8.6.395.17-node.27
15.10.0 v8 8.6.395.17-node.25
15.9.0 v8 8.6.395.17-node.25
15.8.0 v8 8.6.395.17-node.23
15.7.0 v8 8.6.395.17-node.23
15.6.0 v8 8.6.395.17-node.23
15.5.1 v8 8.6.395.17-node.23
15.5.0 v8 8.6.395.17-node.23
15.4.0 v8 8.6.395.17-node.22
15.3.0 v8 8.6.395.17-node.22
15.2.1 v8 8.6.395.17-node.17
15.2.0 v8 8.6.395.17-node.17
15.1.0 v8 8.6.395.17-node.16
15.0.1 v8 8.6.395.17-node.15
15.0.0 v8 8.6.395.16-node.15
4% complete4% complete 		14.21.3
(these versions have identical results)
14.21.3 v8 8.4.371.23-node.88
14.21.2 v8 8.4.371.23-node.88
14.21.1 v8 8.4.371.23-node.87
14.21.0 v8 8.4.371.23-node.87
14.20.1 v8 8.4.371.23-node.87
14.20.0 v8 8.4.371.23-node.87
14.19.3 v8 8.4.371.23-node.87
14.19.2 v8 8.4.371.23-node.87
14.19.1 v8 8.4.371.23-node.85
14.19.0 v8 8.4.371.23-node.85
4% complete4% complete 		14.18.3
(these versions have identical results)
14.18.3 v8 8.4.371.23-node.85
14.18.2 v8 8.4.371.23-node.85
14.18.1 v8 8.4.371.23-node.84
14.18.0 v8 8.4.371.23-node.84
14.17.6 v8 8.4.371.23-node.76
14.17.5 v8 8.4.371.23-node.76
14.17.4 v8 8.4.371.23-node.76
14.17.3 v8 8.4.371.23-node.67
14.17.2 v8 8.4.371.23-node.67
14.17.1 v8 8.4.371.23-node.67
14.17.0 v8 8.4.371.23-node.63
14.16.1 v8 8.4.371.19-node.18
14.16.0 v8 8.4.371.19-node.18
14.15.5 v8 8.4.371.19-node.18
14.15.4 v8 8.4.371.19-node.17
14.15.3 v8 8.4.371.19-node.17
14.15.2 v8 8.4.371.19-node.17
14.15.1 v8 8.4.371.19-node.17
14.15.0 v8 8.4.371.19-node.17
14.14.0 v8 8.4.371.19-node.17
14.13.1 v8 8.4.371.19-node.16
14.13.0 v8 8.4.371.19-node.16
14.12.0 v8 8.4.371.19-node.16
14.11.0 v8 8.4.371.19-node.16
14.10.1 v8 8.4.371.19-node.16
14.10.0 v8 8.4.371.19-node.16
14.9.0 v8 8.4.371.19-node.13
14.8.0 v8 8.4.371.19-node.12
14.7.0 v8 8.4.371.19-node.12
14.6.0 v8 8.4.371.19-node.12
4% complete4% complete 		14.5.0
(these versions have identical results)
14.5.0 v8 8.3.110.9-node.23
14.4.0 v8 8.1.307.31-node.33
14.3.0 v8 8.1.307.31-node.33
14.2.0 v8 8.1.307.31-node.33
14.1.0 v8 8.1.307.31-node.32
14.0.0 v8 8.1.307.30-node.30
4% complete4% complete 		13.14.0
(these versions have identical results)
13.14.0 v8 7.9.317.25-node.32
13.13.0 v8 7.9.317.25-node.30
13.12.0 v8 7.9.317.25-node.30
4% complete4% complete 		13.11.0
(these versions have identical results)
13.11.0 v8 7.9.317.25-node.29
13.10.1 v8 7.9.317.25-node.29
13.10.0 v8 7.9.317.25-node.29
13.9.0 v8 7.9.317.25-node.28
13.8.0 v8 7.9.317.25-node.28
13.7.0 v8 7.9.317.25-node.28
13.6.0 v8 7.9.317.25-node.26
13.5.0 v8 7.9.317.25-node.23
13.4.0 v8 7.9.317.25-node.23
13.3.0 v8 7.9.317.25-node.23
13.2.0 v8 7.9.317.23-node.20
4% complete4% complete 		13.1.0
(these versions have identical results)
13.1.0 v8 7.8.279.17-node.19
13.0.1 v8 7.8.279.17-node.14
13.0.0 v8 7.8.279.17-node.14
4% complete4% complete 		12.22.12
(these versions have identical results)
12.22.12 v8 7.8.279.23-node.57
12.22.11 v8 7.8.279.23-node.56
12.22.10 v8 7.8.279.23-node.56
12.22.9 v8 7.8.279.23-node.56
12.22.8 v8 7.8.279.23-node.56
12.22.7 v8 7.8.279.23-node.56
12.22.6 v8 7.8.279.23-node.56
12.22.5 v8 7.8.279.23-node.56
12.22.4 v8 7.8.279.23-node.56
12.22.3 v8 7.8.279.23-node.46
12.22.2 v8 7.8.279.23-node.46
12.22.1 v8 7.8.279.23-node.46
12.22.0 v8 7.8.279.23-node.46
12.21.0 v8 7.8.279.23-node.45
12.20.2 v8 7.8.279.23-node.45
12.20.1 v8 7.8.279.23-node.45
12.20.0 v8 7.8.279.23-node.45
12.19.1 v8 7.8.279.23-node.44
12.19.0 v8 7.8.279.23-node.44
12.18.4 v8 7.8.279.23-node.39
12.18.3 v8 7.8.279.23-node.39
12.18.2 v8 7.8.279.23-node.39
12.18.1 v8 7.8.279.23-node.38
12.18.0 v8 7.8.279.23-node.37
12.17.0 v8 7.8.279.23-node.37
4% complete4% complete 		12.16.3
(these versions have identical results)
12.16.3 v8 7.8.279.23-node.35
12.16.2 v8 7.8.279.23-node.34
12.16.1 v8 7.8.279.23-node.31
12.16.0 v8 7.8.279.23-node.31
12.15.0 v8 7.7.299.13-node.16
12.14.1 v8 7.7.299.13-node.16
12.14.0 v8 7.7.299.13-node.16
12.13.1 v8 7.7.299.13-node.16
12.13.0 v8 7.7.299.13-node.12
12.12.0 v8 7.7.299.13-node.12
12.11.1 v8 7.7.299.11-node.12
12.11.0 v8 7.7.299.11-node.12
4% complete4% complete 		12.10.0
(these versions have identical results)
12.10.0 v8 7.6.303.29-node.16
12.9.1 v8 7.6.303.29-node.15
12.9.0 v8 7.6.303.29-node.15
4% complete4% complete 		12.8.1
(these versions have identical results)
12.8.1 v8 7.5.288.22-node.16
12.8.0 v8 7.5.288.22-node.16
12.7.0 v8 7.5.288.22-node.16
12.6.0 v8 7.5.288.22-node.14
12.5.0 v8 7.5.288.22-node.14
4% complete4% complete 		12.4.0
(these versions have identical results)
12.4.0 v8 7.4.288.27-node.18
12.3.1 v8 7.4.288.27-node.18
12.3.0 v8 7.4.288.27-node.17
12.2.0 v8 7.4.288.21-node.17
12.1.0 v8 7.4.288.21-node.16
4% complete4% complete 		12.0.0
(these versions have identical results)
12.0.0 v8 7.4.288.21-node.16
4% complete4% complete 		11.15.0
(these versions have identical results)
11.15.0 v8 7.0.276.38-node.19
11.14.0 v8 7.0.276.38-node.18
11.13.0 v8 7.0.276.38-node.18
11.12.0 v8 7.0.276.38-node.18
11.11.0 v8 7.0.276.38-node.18
11.10.1 v8 7.0.276.38-node.17
11.10.0 v8 7.0.276.38-node.17
11.9.0 v8 7.0.276.38-node.16
11.8.0 v8 7.0.276.38-node.16
11.7.0 v8 7.0.276.38-node.16
11.6.0 v8 7.0.276.38-node.13
11.5.0 v8 7.0.276.38-node.13
11.4.0 v8 7.0.276.38-node.13
11.3.0 v8 7.0.276.38-node.11
11.2.0 v8 7.0.276.38-node.11
11.1.0 v8 7.0.276.32-node.7
11.0.0 v8 7.0.276.28-node.5
4% complete4% complete 		10.24.1
(these versions have identical results)
10.24.1 v8 6.8.275.32-node.59
10.24.0 v8 6.8.275.32-node.59
10.23.3 v8 6.8.275.32-node.59
10.23.2 v8 6.8.275.32-node.59
10.23.1 v8 6.8.275.32-node.59
10.23.0 v8 6.8.275.32-node.59
10.22.1 v8 6.8.275.32-node.58
10.22.0 v8 6.8.275.32-node.58
10.21.0 v8 6.8.275.32-node.56
10.20.1 v8 6.8.275.32-node.56
10.20.0 v8 6.8.275.32-node.56
10.19.0 v8 6.8.275.32-node.55
10.18.1 v8 6.8.275.32-node.55
10.18.0 v8 6.8.275.32-node.54
10.17.0 v8 6.8.275.32-node.54
10.16.3 v8 6.8.275.32-node.54
10.16.2 v8 6.8.275.32-node.54
10.16.1 v8 6.8.275.32-node.54
10.16.0 v8 6.8.275.32-node.52
4% complete4% complete 		10.15.3
(these versions have identical results)
10.15.3 v8 6.8.275.32-node.51
10.15.2 v8 6.8.275.32-node.12
10.15.1 v8 6.8.275.32-node.12
10.15.0 v8 6.8.275.32-node.45
10.14.2 v8 6.8.275.32-node.45
10.14.1 v8 6.8.275.32-node.36
10.14.0 v8 6.8.275.32-node.36
10.13.0 v8 6.8.275.32-node.36
10.12.0 v8 6.8.275.32-node.35
10.11.0 v8 6.8.275.32-node.28
10.10.0 v8 6.8.275.30-node.24
10.9.0 v8 6.8.275.24-node.14
4% complete4% complete 		10.8.0
(these versions have identical results)
10.8.0 v8 6.7.288.49-node.19
10.7.0 v8 6.7.288.49-node.15
10.6.0 v8 6.7.288.46-node.13
4% complete4% complete 		10.5.0
(these versions have identical results)
10.5.0 v8 6.7.288.46-node.8
10.4.1 v8 6.7.288.45-node.7
10.4.0 v8 6.7.288.43-node.7
4% complete4% complete 		10.3.0
(these versions have identical results)
10.3.0 v8 6.6.346.32-node.9
10.2.1 v8 6.6.346.32-node.8
10.2.0 v8 6.6.346.32-node.8
10.1.0 v8 6.6.346.27-node.6
10.0.0 v8 6.6.346.24-node.5
4% complete4% complete 		9.11.2
(these versions have identical results)
9.11.2 v8 6.2.414.46-node.23
9.11.1 v8 6.2.414.46-node.23
9.11.0 v8 6.2.414.46-node.23
9.10.1 v8 6.2.414.46-node.23
9.10.0 v8 6.2.414.46-node.23
9.9.0 v8 6.2.414.46-node.22
9.8.0 v8 6.2.414.46-node.21
9.7.1 v8 6.2.414.46-node.20
9.7.0 v8 6.2.414.46-node.20
9.6.1 v8 6.2.414.46-node.20
9.6.0 v8 6.2.414.46-node.20
9.5.0 v8 6.2.414.46-node.18
9.4.0 v8 6.2.414.46-node.17
9.3.0 v8 6.2.414.46-node.15
9.2.1 v8 6.2.414.44-node.11
9.2.0 v8 6.2.414.44-node.11
9.1.0 v8 6.2.414.32-node.8
9.0.0 v8 6.2.414.32-node.8
8.17.0 v8 6.2.414.78
8.16.2 v8 6.2.414.78
8.16.1 v8 6.2.414.77
8.16.0 v8 6.2.414.77
8.15.1 v8 6.2.414.75
8.15.0 v8 6.2.414.75
8.14.1 v8 6.2.414.75
8.14.0 v8 6.2.414.72
8.13.0 v8 6.2.414.72
8.12.0 v8 6.2.414.66
8.11.4 v8 6.2.414.54
8.11.3 v8 6.2.414.54
8.11.2 v8 6.2.414.54
8.11.1 v8 6.2.414.50
8.11.0 v8 6.2.414.50
8.10.0 v8 6.2.414.50
4% complete4% complete 		8.9.4
(these versions have identical results)
8.9.4 v8 6.1.534.50
8.9.3 v8 6.1.534.48
8.9.2 v8 6.1.534.48
8.9.1 v8 6.1.534.47
8.9.0 v8 6.1.534.46
8.8.1 v8 6.1.534.42
8.8.0 v8 6.1.534.42
8.7.0 v8 6.1.534.42
4% complete4% complete 		8.6.0
(these versions have identical results)
8.6.0 v8 6.0.287.53
8.5.0 v8 6.0.287.53
8.4.0 v8 6.0.286.52
8.3.0 v8 6.0.286.52
4% complete4% complete 		8.2.1
(these versions have identical results)
8.2.1 v8 5.8.283.41
8.2.0 v8 5.8.283.41
8.1.4 v8 5.8.283.41
8.1.3 v8 5.8.283.41
8.1.2 v8 5.8.283.41
8.1.1 v8 5.8.283.41
8.1.0 v8 5.8.283.41
8.0.0 v8 5.8.283.41
4% complete4% complete 		7.10.1
(these versions have identical results)
7.10.1 v8 5.5.372.43
7.10.0 v8 5.5.372.43
7.9.0 v8 5.5.372.43
7.8.0 v8 5.5.372.43
7.7.4 v8 5.5.372.42
7.7.3 v8 5.5.372.41
7.7.2 v8 5.5.372.41
7.7.1 v8 5.5.372.41
7.7.0 v8 5.5.372.41
7.6.0 v8 5.5.372.40
4% complete4% complete 		7.5.0
(these versions have identical results)
7.5.0 v8 5.4.500.48
7.4.0 v8 5.4.500.45
7.3.0 v8 5.4.500.45
7.2.1 v8 5.4.500.44
7.2.0 v8 5.4.500.43
7.1.0 v8 5.4.500.36
7.0.0 v8 5.4.500.36
4% complete4% complete 		6.17.1
(these versions have identical results)
6.17.1 v8 5.1.281.111
6.17.0 v8 5.1.281.111
6.16.0 v8 5.1.281.111
6.15.1 v8 5.1.281.111
6.15.0 v8 5.1.281.111
6.14.4 v8 5.1.281.111
6.14.3 v8 5.1.281.111
6.14.2 v8 5.1.281.111
6.14.1 v8 5.1.281.111
6.14.0 v8 5.1.281.111
6.13.1 v8 5.1.281.111
6.13.0 v8 5.1.281.111
6.12.3 v8 5.1.281.111
6.12.2 v8 5.1.281.109
6.12.1 v8 5.1.281.109
6.12.0 v8 5.1.281.108
6.11.5 v8 5.1.281.108
6.11.4 v8 5.1.281.108
6.11.3 v8 5.1.281.107
6.11.2 v8 5.1.281.103
6.11.1 v8 5.1.281.103
6.11.0 v8 5.1.281.102
6.10.3 v8 5.1.281.101
6.10.2 v8 5.1.281.98
6.10.1 v8 5.1.281.95
6.10.0 v8 5.1.281.93
6.9.5 v8 5.1.281.89
6.9.4 v8 5.1.281.89
6.9.3 v8 5.1.281.89
6.9.2 v8 5.1.281.88
6.9.1 v8 5.1.281.84
6.9.0 v8 5.1.281.84
6.8.1 v8 5.1.281.84
6.8.0 v8 5.1.281.84
6.7.0 v8 5.1.281.83
6.6.0 v8 5.1.281.83
6.5.0 v8 5.1.281.81
4% complete4% complete 		6.4.0
(these versions have identical results)
6.4.0 v8 5.0.71.60
6.3.1 v8 5.0.71.57
6.3.0 v8 5.0.71.52
6.2.2 v8 5.0.71.52
6.2.1 v8 5.0.71.52
6.2.0 v8 5.0.71.47
6.1.0 v8 5.0.71.35
6.0.0 v8 5.0.71.35
4% complete4% complete 		5.12.0
(these versions have identical results)
5.12.0 v8 4.6.85.32
5.11.1 v8 4.6.85.31
5.11.0 v8 4.6.85.31
5.10.1 v8 4.6.85.31
5.10.0 v8 4.6.85.31
5.9.1 v8 4.6.85.31
5.9.0 v8 4.6.85.31
5.8.0 v8 4.6.85.31
5.7.1 v8 4.6.85.31
5.7.0 v8 4.6.85.31
5.6.0 v8 4.6.85.31
5.5.0 v8 4.6.85.31
5.4.1 v8 4.6.85.31
5.4.0 v8 4.6.85.31
5.3.0 v8 4.6.85.31
5.2.0 v8 4.6.85.31
5.1.1 v8 4.6.85.31
5.1.0 v8 4.6.85.31
5.0.0 v8 4.6.85.28
4% complete4% complete 		4.9.1
(these versions have identical results)
4.9.1 v8 4.5.103.53
4.9.0 v8 4.5.103.53
4.8.7 v8 4.5.103.53
4.8.6 v8 4.5.103.53
4.8.5 v8 4.5.103.47
4.8.4 v8 4.5.103.47
4.8.3 v8 4.5.103.47
4.8.2 v8 4.5.103.46
4.8.1 v8 4.5.103.46
4.8.0 v8 4.5.103.45
4.7.3 v8 4.5.103.43
4.7.2 v8 4.5.103.43
4.7.1 v8 4.5.103.43
4.7.0 v8 4.5.103.43
4.6.2 v8 4.5.103.42
4.6.1 v8 4.5.103.37
4.6.0 v8 4.5.103.37
4.5.0 v8 4.5.103.37
4.4.7 v8 4.5.103.36
4.4.6 v8 4.5.103.36
4.4.5 v8 4.5.103.35
4.4.4 v8 4.5.103.35
4.4.3 v8 4.5.103.35
4.4.2 v8 4.5.103.35
4.4.1 v8 4.5.103.35
4.4.0 v8 4.5.103.35
4.3.2 v8 4.5.103.35
4.3.1 v8 4.5.103.35
4.3.0 v8 4.5.103.35
4.2.6 v8 4.5.103.35
4.2.5 v8 4.5.103.35
4.2.4 v8 4.5.103.35
4.2.3 v8 4.5.103.35
4.2.2 v8 4.5.103.35
4.2.1 v8 4.5.103.35
4.2.0 v8 4.5.103.35
4.1.2 v8 4.5.103.35
4.1.1 v8 4.5.103.33
4.1.0 v8 4.5.103.33
4.0.0 v8 4.5.103.30
4% complete4% complete 		0.12.18
(these versions have identical results)
0.12.18 v8 3.28.71.20
4% complete4% complete 		0.10.48
(these versions have identical results)
0.10.48 v8 3.14.5.11
4% complete4% complete

Stage 3

Class and Property Decorators

ยงclass decorators
?
function(){
class A { @nonconf get B() {} } function nonconf(target, name, descriptor) { descriptor.configurable = false; return descriptor; } return Object.getOwnPropertyDescriptor(A.prototype, "B").configurable === false;
}
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function(){
class A { @nonconf get B() {} } function nonconf(target, name, descriptor) { descriptor.configurable = false; return descriptor; } return Object.getOwnPropertyDescriptor(A.prototype, "B").configurable === false;
}

Legacy RegExp features in JavaScript

ยงRegExp "lastMatch"
?
function(){
var re = /\w/; re.exec('x'); return RegExp.lastMatch === 'x';
}
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function(){
var re = /\w/; re.exec('x'); return RegExp.lastMatch === 'x';
}
ยงRegExp.$1-$9
?
function(){
for (var i = 1; i < 10; i++) { if (!(('$' + i) in RegExp)) return false; } return true;
}
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function(){
for (var i = 1; i < 10; i++) { if (!(('$' + i) in RegExp)) return false; } return true;
}

Uint8Array to/from base64 and hex

ยงUint8Array.toBase64()
?
function(){
const arr = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); return arr.toBase64() === "SGVsbG8gV29ybGQ=";
}
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function(){
const arr = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); return arr.toBase64() === "SGVsbG8gV29ybGQ=";
}
ยงUint8Array.fromBase64()
?
function(){
const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); const arr2 = Uint8Array.fromBase64("SGVsbG8gV29ybGQ="); return arr1.length === arr2.length && arr1.every((element, index) => element === arr2[index]);
}
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function(){
const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); const arr2 = Uint8Array.fromBase64("SGVsbG8gV29ybGQ="); return arr1.length === arr2.length && arr1.every((element, index) => element === arr2[index]);
}
ยงUint8Array.setFromBase64()
?
function(){
const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); let arr2 = new Uint8Array(16); let { read, written } = arr2.setFromBase64("SGVsbG8gV29ybGQ="); return read == 16 && written == 11 && arr1.every((element, index) => element === arr2[index]);
}
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const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); let arr2 = new Uint8Array(16); let { read, written } = arr2.setFromBase64("SGVsbG8gV29ybGQ="); return read == 16 && written == 11 && arr1.every((element, index) => element === arr2[index]);
}
ยงUint8Array.toHex()
?
function(){
const arr = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); return arr.toHex() === "48656c6c6f20576f726c64";
}
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function(){
const arr = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); return arr.toHex() === "48656c6c6f20576f726c64";
}
ยงUint8Array.fromHex()
?
function(){
const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); const arr2 = Uint8Array.fromHex("48656c6c6f20576f726c64"); return arr1.length === arr2.length && arr1.every((element, index) => element === arr2[index]);
}
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const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); const arr2 = Uint8Array.fromHex("48656c6c6f20576f726c64"); return arr1.length === arr2.length && arr1.every((element, index) => element === arr2[index]);
}
ยงUint8Array.setFromHex()
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function(){
const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); let arr2 = new Uint8Array(16); let { read, written } = arr2.setFromHex("48656c6c6f20576f726c64"); return read == 22 && written == 11 && arr1.every((element, index) => element === arr2[index]);
}
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function(){
const arr1 = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); let arr2 = new Uint8Array(16); let { read, written } = arr2.setFromHex("48656c6c6f20576f726c64"); return read == 22 && written == 11 && arr1.every((element, index) => element === arr2[index]);
}

Explicit Resource Management

ยงusing
?
function(){
var resource = { disposed: false, [Symbol.dispose]() { this.disposed = true; } }; { using _ = resource; } return resource.disposed
}
Yes
Yes
Yes
Yes
Yes
Yes
Error
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function(){
var resource = { disposed: false, [Symbol.dispose]() { this.disposed = true; } }; { using _ = resource; } return resource.disposed
}
ยงfor (using ... of
?
function(){
var resource1 = { disposed: false, [Symbol.dispose]() { this.disposed = true; } }; var resource2 = { disposed: false, [Symbol.dispose]() { this.disposed = true; } }; { for (using _ of [resource1, resource2]); } return resource1.disposed && resource2.disposed;
}
Yes
Yes
Yes
Yes
Yes
Yes
Error
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function(){
var resource1 = { disposed: false, [Symbol.dispose]() { this.disposed = true; } }; var resource2 = { disposed: false, [Symbol.dispose]() { this.disposed = true; } }; { for (using _ of [resource1, resource2]); } return resource1.disposed && resource2.disposed;
}
ยงawait using
?
function(){
(async function () { var resource = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true; } }; { await using _ = resource; } return resource.disposed && asyncTestPassed(); }());
}
Yes
Yes
Yes
Yes
Yes
Yes
Error
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function(){
(async function () { var resource = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true; } }; { await using _ = resource; } return resource.disposed && asyncTestPassed(); }());
}
ยงfor (await using ... of
?
function(){
var resource1 = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true; } }; var resource2 = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true; } }; (async function () { for (await using _ of [resource1, resource2]); return resource1.disposed && resource2.disposed && asyncTestPassed(); }());
}
Yes
Yes
Yes
Yes
Yes
Yes
Error
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function(){
var resource1 = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true; } }; var resource2 = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true; } }; (async function () { for (await using _ of [resource1, resource2]); return resource1.disposed && resource2.disposed && asyncTestPassed(); }());
}
ยงSuppressedError
?
function(){
var err1 = new Error(); var err2 = new Error(); var err3 = new Error(); try { using _1 = { [Symbol.dispose]() { throw err1 } }, _2 = { [Symbol.dispose]() { throw err2 } }; throw err3; } catch (e) { return ( e instanceof SuppressedError && e.error === err1 && e.suppressed instanceof SuppressedError && e.suppressed.error === err2 && e.suppressed.suppressed === err3 ); }
}
Yes
Yes
Yes
Yes
Yes
Yes
Error
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function(){
var err1 = new Error(); var err2 = new Error(); var err3 = new Error(); try { using _1 = { [Symbol.dispose]() { throw err1 } }, _2 = { [Symbol.dispose]() { throw err2 } }; throw err3; } catch (e) { return ( e instanceof SuppressedError && e.error === err1 && e.suppressed instanceof SuppressedError && e.suppressed.error === err2 && e.suppressed.suppressed === err3 ); }
}
ยงDisposableStack
?
function(){
var stack1 = new DisposableStack(); var resource1 = { disposed: false }; var resource2 = { disposed: false }; var resource3 = { disposed: false, [Symbol.dispose]() { this.disposed = true } }; var adopted = stack1.adopt(resource1, function (r) { r.disposed = true }); var deferred = stack1.defer(function (r) { resource2.disposed = true }); var stack2 = stack1.move(); var used = stack2.use(resource3); stack2.dispose(); return ( resource1.disposed && adopted === resource1 && resource2.disposed && deferred === undefined && resource3.disposed && used === resource3 );
}
Yes
Yes
Yes
Yes
Yes
Yes
Error
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function(){
var stack1 = new DisposableStack(); var resource1 = { disposed: false }; var resource2 = { disposed: false }; var resource3 = { disposed: false, [Symbol.dispose]() { this.disposed = true } }; var adopted = stack1.adopt(resource1, function (r) { r.disposed = true }); var deferred = stack1.defer(function (r) { resource2.disposed = true }); var stack2 = stack1.move(); var used = stack2.use(resource3); stack2.dispose(); return ( resource1.disposed && adopted === resource1 && resource2.disposed && deferred === undefined && resource3.disposed && used === resource3 );
}
ยงAsyncDisposableStack
?
function(){
var stack1 = new AsyncDisposableStack(); var resource1 = { disposed: false }; var resource2 = { disposed: false }; var resource3 = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true } }; var adopted = stack1.adopt(resource1, async function (r) { r.disposed = true }); var deferred = stack1.defer(async function (r) { resource2.disposed = true }); var stack2 = stack1.move(); var used = stack2.use(resource3); stack2.disposeAsync().then(function () { resource1.disposed && adopted === resource1 && resource2.disposed && deferred === undefined && resource3.disposed && used === resource3 && asyncTestPassed(); });
}
Yes
Yes
Yes
Yes
Yes
Yes
Error
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function(){
var stack1 = new AsyncDisposableStack(); var resource1 = { disposed: false }; var resource2 = { disposed: false }; var resource3 = { disposed: false, async [Symbol.asyncDispose]() { this.disposed = true } }; var adopted = stack1.adopt(resource1, async function (r) { r.disposed = true }); var deferred = stack1.defer(async function (r) { resource2.disposed = true }); var stack2 = stack1.move(); var used = stack2.use(resource3); stack2.disposeAsync().then(function () { resource1.disposed && adopted === resource1 && resource2.disposed && deferred === undefined && resource3.disposed && used === resource3 && asyncTestPassed(); });
}

Stage 2.7

ยงShadowRealm
?
function(){
return typeof ShadowRealm === "function" && ["evaluate", "importValue"].every(function(key){ return key in ShadowRealm.prototype; });
}
No
No
No
No
No
No
No
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function(){
return typeof ShadowRealm === "function" && ["evaluate", "importValue"].every(function(key){ return key in ShadowRealm.prototype; });
}

Map.prototype.upsert

ยงMap.prototype.upsert
?
function(){
const map = new Map([['a', 1]]); if (map.upsert('a', it => 2, () => 3) !== 2) return false; if (map.upsert('b', it => 2, () => 3) !== 3) return false; return Array.from(map).join() === 'a,2,b,3';
}
Error
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function(){
const map = new Map([['a', 1]]); if (map.upsert('a', it => 2, () => 3) !== 2) return false; if (map.upsert('b', it => 2, () => 3) !== 3) return false; return Array.from(map).join() === 'a,2,b,3';
}
ยงWeakMap.prototype.upsert
?
function(){
const a = {}, b = {}; const map = new WeakMap([[a, 1]]); if (map.upsert(a, it => 2, () => 3) !== 2) return false; if (map.upsert(b, it => 2, () => 3) !== 3) return false; return map.get(a) === 2 && map.get(b) === 3;
}
Error
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function(){
const a = {}, b = {}; const map = new WeakMap([[a, 1]]); if (map.upsert(a, it => 2, () => 3) !== 2) return false; if (map.upsert(b, it => 2, () => 3) !== 3) return false; return map.get(a) === 2 && map.get(b) === 3;
}

Stage 2

ยงGenerator function.sent Meta Property
?
function(){
var result; function* generator() { result = function.sent; } var iter = generator(); iter.next('tromple'); return result === 'tromple';
}
Error
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function(){
var result; function* generator() { result = function.sent; } var iter = generator(); iter.next('tromple'); return result === 'tromple';
}
ยงArray.isTemplateObject
?
function(){
return !Array.isTemplateObject([]) && Array.isTemplateObject((it => it)`a${1}c`);
}
Error
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Error
function(){
return !Array.isTemplateObject([]) && Array.isTemplateObject((it => it)`a${1}c`);
}

throw expressions

ยงlogical
?
function(){
var a, b; try { a = 19 || throw 77; b = 88 && throw 23; } catch (e) { return a + e === 42; }
}
Error
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function(){
var a, b; try { a = 19 || throw 77; b = 88 && throw 23; } catch (e) { return a + e === 42; }
}
ยงparameter initializers
?
function(){
function fn (arg = throw 42) { return arg; } if (fn(21) !== 21) return false; try { fn(); } catch (e) { return e === 42; }
}
Error
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Error
function(){
function fn (arg = throw 42) { return arg; } if (fn(21) !== 21) return false; try { fn(); } catch (e) { return e === 42; }
}
ยงarrow function bodies
?
function(){
var fn = () => throw 42; try { fn(); } catch (e) { return e === 42; }
}
Error
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function(){
var fn = () => throw 42; try { fn(); } catch (e) { return e === 42; }
}
ยงconditionals
?
function(){
true ? 42 : throw 21; try { false ? 42 : throw 21; } catch (e) { return e === 21; }
}
Error
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function(){
true ? 42 : throw 21; try { false ? 42 : throw 21; } catch (e) { return e === 21; }
}

Async Iterator Helpers

ยงinstanceof AsyncIterator
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function(){
return (async function*() {})() instanceof AsyncIterator;
}
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function(){
return (async function*() {})() instanceof AsyncIterator;
}
ยงextends AsyncIterator
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function(){
class Class extends AsyncIterator { } const instance = new Class(); return instance[Symbol.asyncIterator]() === instance;
}
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function(){
class Class extends AsyncIterator { } const instance = new Class(); return instance[Symbol.asyncIterator]() === instance;
}
ยงAsyncIterator.from, async iterable
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } const iterator = AsyncIterator.from(async function*() { yield * [1, 2, 3] }()); if (!('next' in iterator) || !(iterator instanceof AsyncIterator)) return false; toArray(iterator).then(it => { if (it.join() === '1,2,3') asyncTestPassed(); });
}
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } const iterator = AsyncIterator.from(async function*() { yield * [1, 2, 3] }()); if (!('next' in iterator) || !(iterator instanceof AsyncIterator)) return false; toArray(iterator).then(it => { if (it.join() === '1,2,3') asyncTestPassed(); });
}
ยงAsyncIterator.from, iterable
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } const iterator = AsyncIterator.from([1, 2, 3]); if (!('next' in iterator) || !(iterator instanceof AsyncIterator)) return false; toArray(iterator).then(it => { if (it.join() === '1,2,3') asyncTestPassed(); });
}
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } const iterator = AsyncIterator.from([1, 2, 3]); if (!('next' in iterator) || !(iterator instanceof AsyncIterator)) return false; toArray(iterator).then(it => { if (it.join() === '1,2,3') asyncTestPassed(); });
}
ยงAsyncIterator.from, iterator
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } const iterator = AsyncIterator.from([1, 2, 3].values()); if (!('next' in iterator) || !(iterator instanceof AsyncIterator)) return false; toArray(iterator).then(it => { if (it.join() === '1,2,3') asyncTestPassed(); });
}
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } const iterator = AsyncIterator.from([1, 2, 3].values()); if (!('next' in iterator) || !(iterator instanceof AsyncIterator)) return false; toArray(iterator).then(it => { if (it.join() === '1,2,3') asyncTestPassed(); });
}
ยงAsyncIterator.prototype.drop
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().drop(1)).then(it => { if (it.join() === '2,3') asyncTestPassed(); });
}
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().drop(1)).then(it => { if (it.join() === '2,3') asyncTestPassed(); });
}
ยงAsyncIterator.prototype.every
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function(){
(async function*() { yield * [1, 2, 3] })().every(it => typeof it === 'number').then(it => { if (it === true) asyncTestPassed(); });
}
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function(){
(async function*() { yield * [1, 2, 3] })().every(it => typeof it === 'number').then(it => { if (it === true) asyncTestPassed(); });
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ยงAsyncIterator.prototype.filter
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().filter(it => it % 2)).then(it => { if (it.join() === '1,3') asyncTestPassed(); });
}
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().filter(it => it % 2)).then(it => { if (it.join() === '1,3') asyncTestPassed(); });
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ยงAsyncIterator.prototype.find
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function(){
(async function*() { yield * [1, 2, 3] })().find(it => it % 2).then(it => { if (it === 1) asyncTestPassed(); });
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function(){
(async function*() { yield * [1, 2, 3] })().find(it => it % 2).then(it => { if (it === 1) asyncTestPassed(); });
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ยงAsyncIterator.prototype.flatMap
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async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().flatMap(it => [it, 0])).then(it => { if (it.join() === '1,0,2,0,3,0') asyncTestPassed(); });
}
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().flatMap(it => [it, 0])).then(it => { if (it.join() === '1,0,2,0,3,0') asyncTestPassed(); });
}
ยงAsyncIterator.prototype.forEach
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function(){
let result = ''; (async function*() { yield * [1, 2, 3] })().forEach(it => result += it).then(() => { if (result === '123') asyncTestPassed(); });
}
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function(){
let result = ''; (async function*() { yield * [1, 2, 3] })().forEach(it => result += it).then(() => { if (result === '123') asyncTestPassed(); });
}
ยงAsyncIterator.prototype.map
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async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().map(it => it * it)).then(it => { if (it.join() === '1,4,9') asyncTestPassed(); });
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().map(it => it * it)).then(it => { if (it.join() === '1,4,9') asyncTestPassed(); });
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ยงAsyncIterator.prototype.reduce
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(async function*() { yield * [1, 2, 3] })().reduce((a, b) => a + b).then(it => { if (it === 6) asyncTestPassed(); });
}
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function(){
(async function*() { yield * [1, 2, 3] })().reduce((a, b) => a + b).then(it => { if (it === 6) asyncTestPassed(); });
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ยงAsyncIterator.prototype.some
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function(){
(async function*() { yield * [1, 2, 3] })().some(it => typeof it === 'number').then(it => { if (it === true) asyncTestPassed(); });
}
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(async function*() { yield * [1, 2, 3] })().some(it => typeof it === 'number').then(it => { if (it === true) asyncTestPassed(); });
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ยงAsyncIterator.prototype.take
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async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().take(2)).then(it => { if (it.join() === '1,2') asyncTestPassed(); });
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function(){
async function toArray(iterator) { const result = []; for await (const it of iterator) result.push(it); return result; } toArray(async function*() { yield * [1, 2, 3] }().take(2)).then(it => { if (it.join() === '1,2') asyncTestPassed(); });
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ยงAsyncIterator.prototype.toArray
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function(){
(async function*() { yield * [1, 2, 3] })().toArray().then(it => { if (Array.isArray(it) && it.join() === '1,2,3') asyncTestPassed(); });
}
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function(){
(async function*() { yield * [1, 2, 3] })().toArray().then(it => { if (Array.isArray(it) && it.join() === '1,2,3') asyncTestPassed(); });
}
ยงAsyncIterator.prototype[@@toStringTag]
?
function(){
return AsyncIterator.prototype[Symbol.toStringTag] === 'AsyncIterator';
}
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function(){
return AsyncIterator.prototype[Symbol.toStringTag] === 'AsyncIterator';
}