Run results for: Set.difference vs Filter

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Set.difference	3977908.2 Ops/sec
Array.filter	1010046.9 Ops/sec
Array.filter with Set.has	4423274.0 Ops/sec

Script Preparation code:

var array1 = Array.from({length: 40}, () => Math.floor(Math.random() * 140));
var array2 = Array.from({length: 20}, () => Math.floor(Math.random() * 140));
var setFromArray1 = new Set(array1)
var setFromArray2 = new Set(array2)

Tests:

Set.difference
const setDiff = setFromArray1.difference(setFromArray2)
Array.filter
const arrayFilter = array1.filter(value => array2.indexOf(value))
Array.filter with Set.has
const arrayFilterWithSetHas = array1.filter(value => setFromArray2.has(value))

Run results for: Set.difference vs Filter

Set.difference

Array.filter

Array.filter with Set.has