Run results for: Set vs Array vs Object for unique list. Then map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Browser: Chrome 140

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Set

33K/s

Object

33K/s

Unique Array

15K/s

View exact numbers

Script Preparation code:

var a = Array(1000).fill(null).map((a, b) => b);

Tests:

Unique Array
var b = []; a.forEach(x => { if (!b.includes(x)) b.push(x); }); b.map(x => x);
Set
var c = new Set(); a.forEach(x => c.add(x)); var d = Array.from(c); d.map(x => x);
Object
var e = {}; a.forEach(x => { if (!e[x]) e[x] = x }); Object.keys(e).map(x => e[x]);