Run results for: lodash partition vs reduce with array push vs two filter loops

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

double filter

38K/s

reduce with array push

34K/s

Lodash partition

13K/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
const [a, b] = _.partition(tabl, e => e % 2)
reduce with array push
const partition = (a, p) => a.reduce((result, e, i) => (result[p(e) ? 0 : 1].push(e), result), [[], []]); const predicate = e => e % 2; const [a, b] = partition(tabl, predicate);
double filter
const a = tabl.filter(e => e % 2); const b = tabl.filter(e => !e % 2);