Run results for: Set has vs object key vs Array includes (key is at the end)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Set.has

20.4M/s

Object[key]

18.3M/s

Includes

1.3M/s

View exact numbers

Test name	Executions per second
✓ Set.has	20,351,868 Ops/sec
Object[key]	18,311,396 Ops/sec
Includes	1,345,262 Ops/sec

Script Preparation code:

var obj = (new Array(1000)).fill(null).reduce((prev, newVal) => {prev[Math.random() + ''] = Math.random() + ''; return prev; }, {});
obj.sausage = 'tst';
var array = Object.keys(obj);
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 vs Array includes (key is at the end)

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

Includes

Object[key]

Set.has