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Run results for:
for vs foreach vs for..in vs for..of (without broken array accesses)
Compare loop performance
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<iframe src="https://measurethat.net/Embed?id=611876" 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/18.5 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
for
26.6M/s
for in
10.7M/s
for..of
8.6M/s
foreach
671K/s
View exact numbers
Test name
Executions per second
✓
for
26,581,338 Ops/sec
for in
10,667,954 Ops/sec
for..of
8,558,130 Ops/sec
foreach
671,454 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) { i; });
for in
for (var i in array) { array[i]; }
for..of
for (var i of array) { i; }