Run results for: array includes vs object key vs set

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Set.has(key)

12.5M/s

Includes

12.4M/s

Object[key]

12.2M/s

View exact numbers

Test name	Executions per second
✓ Set.has(key)	12,544,618 Ops/sec
Includes	12,430,769 Ops/sec
Object[key]	12,226,893 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);

Tests:

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

Run results for: array includes vs object key vs set

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

Includes

Object[key]

Set.has(key)