Run results for: flatMap vs reduce vs loop filtering performance

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:155.0) Gecko/20100101 Firefox/155.0

Browser: Firefox 155

Operating system: Linux

Device Platform: Desktop

Date tested: 19 hours ago

Benchmark engine: Benchmark.js

reduce with push

15K/s

loop with push

11K/s

flatMap

6K/s

View exact numbers

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); }