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Run results for:
map vs. map arrow vs for vs. for in vs. forEach
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=604762" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser:
Chrome 135
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
map
7K/s
map arrow
7K/s
forEach
5K/s
for
5K/s
for in
3K/s
View exact numbers
Test name
Executions per second
✓
map
7,324 Ops/sec
map arrow
6,628 Ops/sec
forEach
5,155 Ops/sec
for
4,646 Ops/sec
for in
2,860 Ops/sec
Script Preparation code:
var a = Array(10000).fill(null).map((a, index) => `foo ${index}`)
Tests:
map
var b = a.map(function(c) { return `${c}+1` ; });
for in
var b = []; for (var i in a) { b.push(`${a[i]}+1`); }
for
var b = []; for (var i = 0; i < a.length; i++) { b.push(`${a[i]}+1`); }
forEach
var b = []; a.forEach(function(c) { b.push(`${c}+1`); });
map arrow
var b = a.map(c => `${c}+1`);