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Run results for:
flatMap vs reduce vs loop filtering performance vs filter/map
https://stackoverflow.com/a/77247681
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Run details:
User agent:
Mozilla/5.0 (Android 16; Mobile; rv:153.0) Gecko/153.0 Firefox/153.0
Browser:
Firefox Mobile 153
Operating system:
Android
Device Platform:
Mobile
Date tested:
one month ago
Test name
Executions per second
flatMap
2790.8 Ops/sec
reduce with push
4611.1 Ops/sec
loop with push
5590.7 Ops/sec
filter/map
3869.2 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); }
filter/map
arr.filter((o) => o.assigned).map((o) => o.name);