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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=554050" 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/128.0.0.0 Safari/537.36
Browser:
Chrome 128
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
for in
6.3M/s
foreach
4.1M/s
for..of
248K/s
for
150K/s
View exact numbers
Test name
Executions per second
✓
for in
6,289,004 Ops/sec
foreach
4,134,097 Ops/sec
for..of
248,238 Ops/sec
for
149,509 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]; }