Run results for: flatMap() vs filter().map() vs reduce() push vs reduce() spread

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

reduce() push

598/s

flatMap()

581/s

filter().map()

269/s

reduce() spread

44/s

View exact numbers

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

var short = arr.filter(x => x <= 1e4);

Tests:

filter().map()
arr.filter(x => x % 12).filter(x => x % 5).filter(x => x % 3).map(x => x/100)
flatMap()
arr.flatMap(x => x % 12 && x % 5 && x % 3 ? x/100 : [])
reduce() push
arr.reduce((newArray, x) => { if (x % 12 && x % 5 && x % 3) { newArray.push(x / 100) } return newArray }, [])
reduce() spread
short.reduce((newArray, x) => { if (x % 12 && x % 5 && x % 3) { return [...newArray, x / 100] } return newArray }, [])