Run results for: lodash partition vs forEach with array spread iterator vs array push vs for each with concat vs two filters with 10000

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

forEach with push

34K/s

Lodash partition

25K/s

two filters

24K/s

forEach with spread

58/s

forEach with concat

15/s

View exact numbers

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var tabl = Array.from({ length: 10000 }).map((value, i) => i)

Tests:

Lodash partition
let result = _.partition(tabl, v => v%2)
forEach with push
let a = [], b = []; let result = tabl.forEach(item => {if (item%2) {a.push(item)} else {b.push(item)}})
forEach with spread
let a = [], b = []; let result = tabl.forEach(item => {if (item%2) {a = [...a, item]} else {b = [...b, item]}})
forEach with concat
let a = [], b = []; let result = tabl.forEach(item => {if (item%2) {a = a.concat(item)} else {b = b.concat(item)}})
two filters
a = tabl.filter(item => item % 2) b = tabl.filter(item => !item % 2)