Run results for: Set vs Filter for unique vs for

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Firefox/68.0

Browser: Firefox 68

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Set spread	158966.1 Ops/sec
Array from set	200775.5 Ops/sec
Filter	66044.1 Ops/sec
Create Set	204691.8 Ops/sec
For	82424.6 Ops/sec

Script Preparation code:

var array = Array.from({length: 40}, () => Math.floor(Math.random() * 140));

var arrayA = Array.from({length: 40}, () => Math.random().toString(36).substring(2, 15));

Tests:

Set spread
const f = [... new Set(array)] const z = [... new Set(arrayA)]
Array from set
const s = new Set(array) const l = Array.from(s) const sa = new Set(array) const la = Array.from(sa)
Filter
const b = array.filter((i,index) => array.indexOf(i)=== index) const ba = arrayA.filter((i,index) => arrayA.indexOf(i)=== index)
Create Set
const ss = new Set(array) const sc = new Set(arrayA)
For
const s ={} const lc = [] for(let i =0; i < array.length; i++){ if (s[array[i]]) { continue } s[array[i]] = 1 lc.push(s[array[i]]) } const sa ={} const lca = [] for(let i =0; i < arrayA.length; i++){ if (s[arrayA[i]]) { continue } sa[arrayA[i]] = 1 lca.push(s[arrayA[i]]) }

Run results for: Set vs Filter for unique vs for

Set spread

Array from set

Filter

Create Set

For