Run results for: flatMap vs reduce vs loop filtering performance vs filter/map

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: 2 months ago

loop with push

6K/s

reduce with push

5K/s

filter/map

4K/s

flatMap

3K/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); }
filter/map
arr.filter((o) => o.assigned).map((o) => o.name);