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Run results for:
FlatMap method vs for loop
Compare the performance of for loop vs flatMap method
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<iframe src="https://measurethat.net/Embed?id=618918" 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/141.0.0.0 Safari/537.36 Edg/141.0.0.0
Browser:
Chrome 141
Operating system:
Windows
Device Platform:
Desktop
Date tested:
9 months ago
for loop
33K/s
flatMap
3K/s
View exact numbers
Test name
Executions per second
✓
for loop
32,603 Ops/sec
flatMap
2,935 Ops/sec
Script Preparation code:
var arr = Array(10_000).fill(0);
Tests:
flatMap
arr.flatMap(x => [x, x * 2]);
for loop
const n = arr.length; const acc = new Array(n * 2); for (let i = 0; i < n; i++){ const x = arr[i]; acc[i * 2] = x; acc[i * 2 + 1] = x * 2; }