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Run results for:
flat vs flatMap vs reduce vs reduce push vs forEach push vs concat spread
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Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.2.1
Device Platform:
Mobile
Date tested:
one year ago
Test name
Executions per second
reduce
18233.4 Ops/sec
flatMap
193528.1 Ops/sec
flat
122673.1 Ops/sec
reduce push
150322.1 Ops/sec
forEach push
138564.5 Ops/sec
concat spread
286159.2 Ops/sec
Script Preparation code:
var arr = Array(100).fill(Array(20).fill(Math.random()*50))
Tests:
reduce
arr.reduce((acc, val) => acc.concat(val), [])
flatMap
arr.flatMap(x => x)
flat
arr.flat()
reduce push
arr.reduce((acc, val) => { if (val) val.forEach(a => acc.push(a)); return acc; }, [])
forEach push
let acc = []; arr.forEach(val => { val && val.forEach(v => acc.push(v)); }), acc;
concat spread
[].concat(...arr)