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Run results for:
for vs foreach vs for..in vs for..of 2142 34124 214 234 2342323
Compare loop performance
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<iframe src="https://measurethat.net/Embed?id=535543" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.0.0
Browser:
Chrome 126
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
for in
1K/s
foreach
762/s
for..of
146/s
for
11/s
View exact numbers
Test name
Executions per second
✓
for in
1,222 Ops/sec
foreach
762 Ops/sec
for..of
146 Ops/sec
for
11 Ops/sec
Script Preparation code:
var array = new Array(1000000);
Tests:
for
for (var i = 0; i < array.length; i++) { var bar = array[i]; }
foreach
array.forEach(function(i) { var bar = array[i]; });
for in
for (var i in array) { var bar = array[i]; }
for..of
for (var i of array) { var bar = i; }