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Run results for:
loops: for vs foreach vs some vs for..of vs for..in
Compare loop performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=491141" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/115.0
Browser:
Firefox 115
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
for..in
75.9M/s
for
1.2M/s
some
901K/s
foreach
288K/s
for..of
171K/s
View exact numbers
Test name
Executions per second
✓
for..in
75,858,048 Ops/sec
for
1,223,839 Ops/sec
some
901,153 Ops/sec
foreach
287,714 Ops/sec
for..of
171,015 Ops/sec
Script Preparation code:
var array = new Array(1000);
Tests:
for
for (var i = 0; i < array.length; i++) { array[i]; }
foreach
array.forEach(function(i) { array[i]; });
some
array.some(function(i) { array[i]; });
for..of
for (var i of array) { array[i]; }
for..in
for (var i in array) { array[i]; }