Run results for: flat vs flatMap vs reduce vs reduce push vs forEach push vs concat spread

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; Redmi 5A) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 108

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: one year ago

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)