Run results for: lodash vs es6 map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

lodash uniq

2.4M/s

es6 map

572K/s

View exact numbers

Test name	Executions per second
✓ lodash uniq	2,438,344 Ops/sec
es6 map	572,351 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var data = [{a: 1}, {a: 2}, {a: 3}, {a: 4}, {a: 5}, {a: 6}, {a: 7}, {a: 8}, {a: 1}];

Tests:

lodash uniq
_.uniqBy(data, 'a');
es6 map
const uniqBy = (arr, predicate) => { const cb = typeof predicate === 'function' ? predicate : (o) => o[predicate]; return [...arr.reduce((map, item) => { const key = (item === null || item === undefined) ? item : cb(item); map.has(key) || map.set(key, item); return map; }, new Map()).values()]; }; uniqBy(data, 'a')