Run results for: set.has vs. array.includes vs object lookup (larger array)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

lookup

180.1M/s

object key

176.0M/s

includes

3.7M/s

array find

217K/s

View exact numbers

Test name	Executions per second
✓ lookup	180,131,648 Ops/sec
object key	176,005,232 Ops/sec
includes	3,715,082 Ops/sec
array find	217,229 Ops/sec

Script Preparation code:

var a = new Array(10000).fill(null).map((_, i) => i).sort(() => Math.random() - 0.5)
var b = new Set(a)
var c = a.reduce((a, b) => ({ ...a, b: true }), {})

Tests:

includes
return a.includes(1)
lookup
return b.has(1)
object key
return c[1]
array find
return a.find(n => n === 100)