Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Run results for:
flatMap vs reduce vs loop filtering vs filter/map performance
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=608244" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 YaBrowser/25.4.0.0 Safari/537.36
Browser:
Yandex Browser 25
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
11 months ago
Test name
Executions per second
flatMap
5294.6 Ops/sec
reduce with push
18207.7 Ops/sec
loop with push
16672.3 Ops/sec
filter with a map
14208.6 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 with a map
arr.filter(item => item.assigned).map(item => item.name)