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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser: Chrome 118

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Array includes	32065122.0 Ops/sec
Set has	32102130.0 Ops/sec
Map has	30838816.0 Ops/sec
object key	31823276.0 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 = {1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9, 10: 10};

Tests:

Array includes
return a.includes(9);
Set has
return b.has(9);
Map has
return c.has(9);
object key
return "9" in d

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

Array includes

Set has

Map has

object key