Run results for: flatMap() vs filter().map() vs reduce() - filtered 1 time out of 10 - large array

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/96.0.4664.53 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 96

Operating system: iOS 15.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
filter().map()	83.2 Ops/sec
flatMap()	119.8 Ops/sec
reduce()	293.0 Ops/sec

Script Preparation code:

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

Tests:

filter().map()
arr.filter(x => x % 10).map(x => x/100)
flatMap()
arr.flatMap(x => x % 10 ? [x/100] : [])
reduce()
arr.reduce((acc, x) => { if (x % 10) acc.push(x / 100) return acc }, [])

Run results for: flatMap() vs filter().map() vs reduce() - filtered 1 time out of 10 - large array

flatMap vs filter map vs reduce()

filter().map()

flatMap()

reduce()