Run results for: flatMap() vs filter().map() vs reduce() vs forOf loop v8

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 5 months ago

reduce()

18K/s

forof loop

16K/s

filter().map()

12K/s

flatMap()

8K/s

View exact numbers

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 10000) arr[i] = i++;

Tests:

filter().map()
arr.filter(x => x % 2).map(x => x/100)
flatMap()
arr.flatMap(x => x % 2 ? x/100 : [])
reduce()
arr.reduce((newArray, x) => { if (x % 2) { newArray.push(x / 100) } return newArray }, [])
forof loop
newArray = []; for (x of arr){ if (x % 2) { newArray.push(x / 100) } }