Run results for: Set has vs object key vs map has

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser: Chrome 117

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Includes

19.8M/s

Set.has

19.0M/s

Map.has

18.6M/s

Object[key]

17.3M/s

View exact numbers

Test name	Executions per second
✓ Includes	19,751,860 Ops/sec
Set.has	19,009,556 Ops/sec
Map.has	18,632,666 Ops/sec
Object[key]	17,276,298 Ops/sec

Script Preparation code:

var obj = (new Array(1000)).fill(null).reduce((prev, newVal) => {prev[Math.random() + ''] = Math.random() + ''; return prev; }, { sausage: 'tst' });
var array = Object.keys(obj);
var set = new Set(array);
var map = new Map(Object.entries(obj));

Tests:

Includes
array.includes('sausage')
Object[key]
obj['sausage']
Set.has
set.has('sausage')
Map.has
map.has('sausage')

Run results for: Set has vs object key vs map has

performance comparison of ways to find if an array contains a value

Includes

Object[key]

Set.has

Map.has