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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Set	583620.4 Ops/sec
_.unionWith	37449.9 Ops/sec
R.unionWith	17150.9 Ops/sec

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.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);
R.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 R.unionWith(R.equals, first, second);

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

Set

_.unionWith

R.unionWith