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Run results for:
for vs foreach vs for..of vs for..of over entries vs for in
Compare loop performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=590779" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.1
Device Platform:
Mobile
Date tested:
one year ago
for
28.1M/s
foreach
14.5M/s
for..of
10.5M/s
for..in
1.2M/s
for..of over entries
1.2M/s
View exact numbers
Test name
Executions per second
✓
for
28,145,284 Ops/sec
foreach
14,462,594 Ops/sec
for..of
10,457,642 Ops/sec
for..in
1,201,672 Ops/sec
for..of over entries
1,161,500 Ops/sec
Script Preparation code:
var array = Array.from({length: 100}); var t;
Tests:
for
for (let i = 0; i < array.length; i++) { t = array[i]; }
foreach
array.forEach(function(v, i) { t = v; });
for..of
for (var v of array) { t = v; }
for..of over entries
for (var [i, v] of array.entries()) { t = v; }
for..in
for (var k in array) { t = array[k]; }