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Run results for:
flatMap vs reduce (concat) vs reduce (push)
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Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0
Browser:
Firefox 151
Operating system:
Windows
Device Platform:
Desktop
Date tested:
24 days ago
Test name
Executions per second
Reduce concat
8.9 Ops/sec
FlatMap
2598.3 Ops/sec
Reduce push
18437.8 Ops/sec
Script Preparation code:
var arr = Array(10_000).fill(1)
Tests:
Reduce concat
arr.reduce((acc, x, index) => acc.concat(x, index % 2 ? x : []), [])
FlatMap
arr.flatMap((x, index) => [x, index % 2 && x]).filter(Boolean)
Reduce push
arr.reduce((acc, x, index) => { acc.push(x); if(index % 2) { acc.push(x) } return acc; }, [])