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Run results for:
for vs foreach vs for..in vs for..of jul 2025
Compare loop performance
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<iframe src="https://measurethat.net/Embed?id=622332" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
8 months ago
for in
14.4M/s
for
4.2M/s
for..of
1.3M/s
foreach
103K/s
View exact numbers
Test name
Executions per second
✓
for in
14,421,995 Ops/sec
for
4,150,934 Ops/sec
for..of
1,339,558 Ops/sec
foreach
102,536 Ops/sec
Script Preparation code:
var array = new Array(1000);
Tests:
for
for (var i = 0; i < array.length; i++) { var x = array[i]; }
foreach
array.forEach((el)=> { var e = el; });
for in
for (var el in array) { var e = el; }
for..of
for (var el of array) { var e = el; }