Run results for: Set has vs object key reversed

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 121

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Object[key]

5.3M/s

Set.has

4.5M/s

Includes

369K/s

View exact numbers

Test name	Executions per second
✓ Object[key]	5,299,131 Ops/sec
Set.has	4,516,372 Ops/sec
Includes	369,331 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).reverse();
var set = new Set(array);

Tests:

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

Run results for: Set has vs object key reversed

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

Includes

Object[key]

Set.has