Run results for: flatMap() vs filter().map() vs reduce() v4

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.0 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 14

Operating system: iOS 14.3

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
filter().map()	400.1 Ops/sec
flatMap()	592.4 Ops/sec
reduce()	1571.5 Ops/sec

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

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()
arr.reduce((newArray, x) => { if (x % 12 && x % 5 && x % 3) { newArray.push(x / 100) } return newArray }, [])

Run results for: flatMap() vs filter().map() vs reduce() v4

flatMap vs filter map vs reduce()

filter().map()

flatMap()

reduce()