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Run results for:
for vs foreach vs for..in vs for..of
Compare loop performance
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<iframe src="https://measurethat.net/Embed?id=532567" 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/17.4.1 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
for in
3.2M/s
foreach
319K/s
for..of
79K/s
for
63K/s
View exact numbers
Test name
Executions per second
✓
for in
3,201,657 Ops/sec
foreach
319,466 Ops/sec
for..of
78,979 Ops/sec
for
62,933 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]; }