Run results for: lodash unionWith vs Set for merging without duplicates

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Set

3.8M/s

unionWith

108K/s

View exact numbers

Test name	Executions per second
✓ Set	3,772,959 Ops/sec
unionWith	107,801 Ops/sec

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.10/lodash.min.js'></script>

Tests:

Set
const first = [ {a: 3, b: 3, c: "hey"}, {a: 3, b: 2, c: "hey"}, {a: 1, b: 2, c: "bye"}, {a: 3, b: 4, c: "hey"}, {a: 2, b: 1, c: "bye"} ]; const second = [ {a: 3, b: 4, c: "hey"}, {a: 2, b: 1, c: "bye"}, {a: 4, b: 4, c: "sup"}, {a: 3, b: 3, c: "hey"} ]; return [...new Set([...first, ...second])]
unionWith
const first = [ {a: 3, b: 3, c: "hey"}, {a: 3, b: 2, c: "hey"}, {a: 1, b: 2, c: "bye"}, {a: 3, b: 4, c: "hey"}, {a: 2, b: 1, c: "bye"} ]; const second = [ {a: 3, b: 4, c: "hey"}, {a: 2, b: 1, c: "bye"}, {a: 4, b: 4, c: "sup"}, {a: 3, b: 3, c: "hey"} ]; return _.unionWith(first, second, _.isEqual);