Run results for: 20240726 - flatMap vs filter/map

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
flatMap	43618.1 Ops/sec
.map.filter	166693.9 Ops/sec

Script Preparation code:

var arr = Array.from({ length: 1000 }).map((_, i) => i)

Tests:

flatMap
const res = arr.flatMap((n) => { if (n % 2 === 0) return [] return [n * 3] })
.map.filter
const res = arr .filter((n) => n % 2 !== 0) .map((n) => n * 3)