Run results for: Set vs Filter vs forEach vs forLoop vs filterWithSet vs map for unique

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Basic forEach

3.2M/s

filterWithSet

1.8M/s

Set spread

1.3M/s

Array from set

1.2M/s

Filter

483K/s

for loop

291K/s

View exact numbers

Script Preparation code:

var array = Array.from({length: 40}, () => Math.floor(Math.random() * 140));

Tests:

Set spread
const f = [... new Set(array)]
Array from set
const s = new Set(array) const l = Array.from(s)
Filter
const b = array.filter((i,index) => array.indexOf(i)=== index)
Basic forEach
const set = {} array.forEach(val => set.hasOwnProperty(val) ? set[val] = true : '') const b = Object.keys(set)
for loop
const set = {} for(var i = 0, l = array.length; i < l; i++){ if(!set.hasOwnProperty(array[i])) set[array[i]] = true } const b = Object.keys(set)
filterWithSet
const set = {} const b = array.filter((val) => { if(!set.hasOwnProperty(val)) { set[val] = true return true } return false })