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Run results for:
for vs foreach vs for..in vs for..of (let instead of var, and optimized for)
Compare loop performance
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<iframe src="https://measurethat.net/Embed?id=629842" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0
Browser:
Firefox 151
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one month ago
for in
27.8M/s
for
8.3M/s
foreach
4.9M/s
for..of
606K/s
View exact numbers
Test name
Executions per second
✓
for in
27,781,294 Ops/sec
for
8,274,394 Ops/sec
foreach
4,880,242 Ops/sec
for..of
606,258 Ops/sec
Script Preparation code:
const array = new Array(100);
Tests:
for
for (let i = 0, length = array.length; i < length; i++) { array[i]; }
foreach
array.forEach(function(i) { array[i]; });
for in
for (let i in array) { array[i]; }
for..of
for (let i of array) { array[i]; }