Run results for: lodash.mapKeys vs Native

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2.1 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Object.keys with for loop

2.1M/s

Object.entries with for loop

987K/s

Object.keys with reduce

979K/s

lodash.mapKeys

971K/s

View exact numbers

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var value = {a: 30310, b: 100303, c: 3040494};

Tests:

lodash.mapKeys
const f = v => _.mapKeys(v, k => k + '-changed') f(value);
Object.keys with for loop
const f = v => { const m = {}; for (const k of Object.keys(v)) m[k + '-changed'] = v[k]; return m; } f(value)
Object.entries with for loop
const f = obj => { const m = {}; for (const [k, v] of Object.entries(obj)) m[k + '-changed'] = v; return m; } f(value)
Object.keys with reduce
const f = obj => Object.keys(obj).reduce( (acc, k) => ({ ...acc, [k + '-changed']: obj[k] }), {} ); f(value)