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Run results for:
flatMap vs reduce with spread vs reduce with concat
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<iframe src="https://measurethat.net/Embed?id=575464" 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/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
reduce with spread
20.5 Ops/sec
flatMap
4848.9 Ops/sec
reduce with concat
6.6 Ops/sec
Script Preparation code:
var arr = Array(10_000).fill(0)
Tests:
reduce with spread
arr.reduce((acc, x) => [...acc, x, x], [])
flatMap
arr.flatMap(x => [x, x])
reduce with concat
arr.reduce((acc, x) => acc.concat(x, x), [])