Run results for: flatMap vs filter.map vs reduce to Object

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

reduce()

52/s

filter().map()

39/s

flatMap()

38/s

View exact numbers

Script Preparation code:

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

Tests:

filter().map()
Object.fromEntries(arr.filter(x => x !== 0 && x % 3 && x !== 666).map(x => [x, Math.round(x * Math.sqrt(x/100))]))
flatMap()
Object.fromEntries(arr.flatMap(x => (x !== 0 && x % 3 && x !== 666) ? [[x, Math.round(x * Math.sqrt(x/100))]] : []))
reduce()
arr.reduce((acc, x) => { if (x !== 0 && x % 3 && x !== 666) { acc[x] =Math.round(x * Math.sqrt(x/100)) } return acc }, {})