Run results for: Lodash vs Set

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Lodash union	2594816.0 Ops/sec
Js set	3054631.0 Ops/sec
custom union	3005150.2 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 a = ['a', 'b', 'c'];
var b = ['b', 'd', 'a', 'e', 'f'];

var customUnion = (x, y) => {
    const existSet = new Set(x)
    const res = [...x]
    y.forEach((z) => {if (!existSet.has(z)) { res.push(z) }})
    return res
}

Tests:

Lodash union
var c = _.union(a, b).join(' ');
Js set
var c = [...new Set([...a ,...b])].join(' ');
custom union
var c = customUnion(a,b).join(' ')

Run results for: Lodash vs Set

Lodash union

Js set

custom union