Run results for: Array.includes vs Set.has vas Map.has vs Object accessor

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1.1

Device Platform: Mobile

Date tested: one year ago

Map has

463.4M/s

Set has

463.1M/s

Object accessor

249.5M/s

Array includes

90.8M/s

View exact numbers

Test name	Executions per second
✓ Map has	463,449,248 Ops/sec
Set has	463,124,704 Ops/sec
Object accessor	249,505,792 Ops/sec
Array includes	90,838,304 Ops/sec

Script Preparation code:

var a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var b = new Set([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
var c = new Map([[1, 1], [2, 2], [3, 3], [4, 4], [5, 5], [6, 6], [7, 7], [8, 8], [9, 9], [10, 10]]);
var d = {a: 1, b: 2, c: 3, d: 4, e: 5, f:6, g:7, h:8, i:9, l:10};

Tests:

Array includes
return a.includes(9);
Set has
return b.has(9);
Map has
return c.has(9);
Object accessor
return d[i]