Run results for: small set vs array lookup

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser: Chrome 136

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

set

119.9M/s

array

49.2M/s

View exact numbers

Test name	Executions per second
✓ set	119,919,184 Ops/sec
array	49,175,380 Ops/sec

Script Preparation code:

var a = [1, 2];
var b = new Set(a)

Tests:

array
const items = [1, 2, 3] const pick = items[Math.floor(Math.random() * items.length)]; a.includes(pick)
set
const items = [1, 2, 3] const pick = items[Math.floor(Math.random() * items.length)]; b.has(pick)