Run results for: for vs foreach vs for..in vs for..of

Run details:

User agent: Mozilla/5.0 (Linux; Android 14; XQ-CT72 Build/64.2.F.2.233; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.180 Mobile Safari/537.36 XWEB/1380143 MMWEBSDK/20250804 MMWEBID/5279 MicroMessenger/8.0.63.2900(0x28003F12) WeChat/arm64 Weixin NetType/WIFI Language/zh_CN ABI/arm64

Browser: Chrome Mobile 138

Operating system: Android

Device Platform: Mobile

Date tested: 11 months ago

for in

5.9M/s

foreach

4.4M/s

for

4.1M/s

for..of

900K/s

View exact numbers

Test name	Executions per second
✓ for in	5,906,692 Ops/sec
foreach	4,409,564 Ops/sec
for	4,125,962 Ops/sec
for..of	899,715 Ops/sec

Script Preparation code:

var array = new Array(100);

Tests:

for
for (var i = 0; i < array.length; i++) { array[i]; }
foreach
array.forEach(function(i) { array[i]; });
for in
for (var i in array) { array[i]; }
for..of
for (var i of array) { array[i]; }