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Run results for:
flatMap vs reduce vs loop filtering performance vs flat.map
https://stackoverflow.com/a/77247681
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<iframe src="https://measurethat.net/Embed?id=621864" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Browser:
Chrome 142
Operating system:
Linux
Device Platform:
Desktop
Date tested:
8 months ago
loop with push
34K/s
reduce with push
20K/s
flatMap
6K/s
map flat()
6K/s
View exact numbers
Test name
Executions per second
✓
loop with push
33,513 Ops/sec
reduce with push
20,423 Ops/sec
flatMap
5,683 Ops/sec
map flat()
5,564 Ops/sec
Script Preparation code:
var arr = Array.from({length:10000}, (v, i) => ({name: i, assigned: Math.random() < 0.5}));
Tests:
flatMap
arr.flatMap((o) => (o.assigned ? [o.name] : []));
reduce with push
arr.reduce((a, o) => (o.assigned && a.push(o.name), a), [])
loop with push
{ const a = []; for (const o of arr) if (o.assigned) a.push(o.name); }
map flat()
arr.flat().map((o) => o.assigned ? [o.name] : [])