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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=577507" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0
Browser:
Firefox 133
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
for
3.5M/s
for..of
1.1M/s
foreach
1.1M/s
for..of over entries
534K/s
for..in
327K/s
View exact numbers
Test name
Executions per second
✓
for
3,524,940 Ops/sec
for..of
1,123,936 Ops/sec
foreach
1,117,439 Ops/sec
for..of over entries
533,928 Ops/sec
for..in
327,343 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]; }