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Run results for:
flatMap vs reduce vs filter.map
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<iframe src="https://measurethat.net/Embed?id=598411" 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/135.0.0.0 Safari/537.36
Browser:
Chrome 135
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
filter().map()
11.5M/s
reduce()
3.0M/s
flatMap()
2.8M/s
View exact numbers
Test name
Executions per second
✓
filter().map()
11,467,173 Ops/sec
reduce()
2,975,090 Ops/sec
flatMap()
2,825,460 Ops/sec
Script Preparation code:
var arr = Array.from({length: 20}, () => Math.floor(Math.random() * 100));;
Tests:
flatMap()
arr.flatMap((e) => e > 50 ? e / 2 : []);
reduce()
arr.reduce((acc, curr) => curr > 50 ? [...acc, curr / 2] : acc, []);
filter().map()
arr.filter((e) => e > 50).map((e) => e / 2);