Run results for: actual set.has vs. Object lookup vs. key in Object

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 YaBrowser/24.1.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

set has

13.5M/s

includes

13.3M/s

key in obj lookup

13.2M/s

key lookup

12.9M/s

View exact numbers

Test name	Executions per second
✓ set has	13,532,800 Ops/sec
includes	13,252,210 Ops/sec
key in obj lookup	13,168,417 Ops/sec
key lookup	12,896,126 Ops/sec

Script Preparation code:

var a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var b = {1: true, 2: true, 3: true, 4: true, 5: true, 6: true, 7: true, 8: true, 9: true, 10: true}
var c = new Set(a)

Tests:

includes
return a.includes(9)
key lookup
return !!b['9']
key in obj lookup
return '9' in b
set has
return c.has('9')