Run results for: Lodash UniqBy vs. Vanilla alternative

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Lodash (_.uniqBy)

2/s

Vanilla code

1/s

View exact numbers

Test name	Executions per second
✓ Lodash (_.uniqBy)	2 Ops/sec
Vanilla code	1 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

const max2 = 10000000; // 10,000,000 (10 Million)

const arr2 = Array.from({ length: 10000000 }, (_, i) => Math.random() >= 0.5 ? ({ id: i }) : ({ id: Math.floor(Math.random() * 10) + 1 }))

Tests:

Lodash (_.uniqBy)
_.uniqBy(arr2, (el) => el.id)
Vanilla code
const idsAlreadySeen = new Set(); const uniqArr = arr2.filter(data => { if (idsAlreadySeen.has(data.id)) { return false; } idsAlreadySeen.add(data.id); return true; });