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Run results for:
Array loops: for vs for in vs for of vs forEach vs map [fixed for IE]
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<iframe src="https://measurethat.net/Embed?id=622964" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.127 Safari/537.36 OPR/60.3.3004.55692
Browser:
Opera 60
Operating system:
Linux
Device Platform:
Desktop
Date tested:
4 months ago
Test name
Executions per second
for
19258.7 Ops/sec
for in
2645.2 Ops/sec
for of
31794.7 Ops/sec
forEach
5907.8 Ops/sec
map
4446.4 Ops/sec
Script Preparation code:
var arr = []; for (let i = 0; i < 1000; i++) { arr[i] = i; } function foo(bar) { return bar; }
Tests:
for
for (let i = 0, len = arr.length; i < len; i++) { foo(arr[i]); }
for in
for (let i in arr) { foo(arr[i]); }
for of
for (let val of arr) { foo(val); }
forEach
arr.forEach(function(val) { foo(val); });
map
arr.map(function(val) { return foo(val); });