Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Run results for:
flatMap vs reduce vs loop filtering performance vs filter/map
https://stackoverflow.com/a/77247681
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=629014" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Safari/605.1.15
Browser:
Safari 26
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 months ago
reduce with push
11K/s
filter/map
8K/s
loop with push
7K/s
flatMap
4K/s
View exact numbers
Test name
Executions per second
✓
reduce with push
10,731 Ops/sec
filter/map
7,690 Ops/sec
loop with push
7,453 Ops/sec
flatMap
3,865 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);