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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

reduce() push

2K/s

flatMap()

1K/s

filter().map()

442/s

reduce() spread

15/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 }, [])