Run results for: Set has vs object key vs array include

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
Includes	1332641.1 Ops/sec
Object[key]	14625378.0 Ops/sec
Set.has	15797105.0 Ops/sec
map.has	15849242.0 Ops/sec
key in obj	14158992.0 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 map = new Map(Object.entries(obj))
var array = Object.keys(obj);
var set = new Set(array);

Tests:

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

Run results for: Set has vs object key vs array include

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

Includes

Object[key]

Set.has

map.has

key in obj