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Run results for:
for vs foreach vs for..in vs for..of (Fixed)
Compare loop performance
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<iframe src="https://measurethat.net/Embed?id=615018" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36
Browser:
Chrome 139
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
for..of
40.4M/s
for in
12.8M/s
foreach
11.1M/s
for
9.3M/s
View exact numbers
Test name
Executions per second
✓
for..of
40,352,560 Ops/sec
for in
12,806,307 Ops/sec
foreach
11,126,244 Ops/sec
for
9,301,060 Ops/sec
Script Preparation code:
var array = new Array(100);
Tests:
for
for (let i = 0, len = array.length; i < len; i++) { array[i]; }
foreach
array.forEach(function(i) { i; });
for in
for (let i in array) { array[i]; }
for..of
for (let i of array) { i; }