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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=622330" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:146.0) Gecko/20100101 Firefox/146.0
Browser:
Firefox 146
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
8 months ago
for in
172.6M/s
for
2.1M/s
foreach
1.7M/s
for..of
453K/s
View exact numbers
Test name
Executions per second
✓
for in
172,581,360 Ops/sec
for
2,146,778 Ops/sec
foreach
1,712,030 Ops/sec
for..of
453,282 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; }