Benchmark: Set has vs object key vs array include

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;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Includes
Object[key]
Set.has
map.has
key in obj

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 13 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Windows

View result in a separate tab

Test name	Executions per second
Includes	631266.1 Ops/sec
Object[key]	8771094.0 Ops/sec
Set.has	9333071.0 Ops/sec
map.has	9515439.0 Ops/sec
key in obj	8296870.0 Ops/sec

Set has vs object key vs array include (version: 0)

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

Comparing performance of: Includes vs Object[key] vs Set.has vs map.has vs key in obj

Created: 15 days ago by: Guest

Jump to the latest result

Includes

Object[key]

Set.has

map.has

key in obj

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A