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Run results for:
for vs while vs for of vs forEach（optimaized
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=538519" 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/126.0.0.0 Safari/537.36
Browser:
Chrome 126
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
forEach
2.7M/s
for of
2.7M/s
for i--
30K/s
for i++
30K/s
while i--
30K/s
View exact numbers
Test name
Executions per second
✓
forEach
2,744,189 Ops/sec
for of
2,729,406 Ops/sec
for i--
30,373 Ops/sec
for i++
30,263 Ops/sec
while i--
29,740 Ops/sec
Script Preparation code:
var arr = [] for (var i = 0; i < 1000; i++) arr[i] = i
Tests:
for i++
var l = arr.length for (var i = 0; i < l; i++) { var a = arr[i] }
for i--
for (var i = arr.length; i >= 0; i--) { var a = arr[i] }
while i--
var i = arr.length while (i--) { var a = arr[i] }
for of
for (var v of arr) { var a = v }
forEach
arr.forEach(v => { var a = v })