Run results for: Set.has vs Array.includes for small number of items

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36 Edg/132.0.0.0

Browser: Chrome 132

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

set_8

59.7M/s

set_4

59.6M/s

set_1

58.6M/s

set_2

58.4M/s

array_1

49.5M/s

array_4

44.4M/s

array_2

44.3M/s

array_8

38.4M/s

View exact numbers

Test name	Executions per second
✓ set_8	59,723,020 Ops/sec
set_4	59,612,848 Ops/sec
set_1	58,616,264 Ops/sec
set_2	58,414,468 Ops/sec
array_1	49,544,920 Ops/sec
array_4	44,401,620 Ops/sec
array_2	44,347,332 Ops/sec
array_8	38,383,360 Ops/sec

Script Preparation code:

const item_1 = Math.floor(Math.random() * 1);
const array_1 = new Array(1).map((_, i) => i);
const set_1 = new Set(array_1);

const item_2 = Math.floor(Math.random() * 2);
const array_2 = new Array(2).map((_, i) => i);
const set_2 = new Set(array_2);

const item_4 = Math.floor(Math.random() * 4);
const array_4 = new Array(4).map((_, i) => i);
const set_4 = new Set(array_4);

const item_8 = Math.floor(Math.random() * 8);
const array_8 = new Array(8).map((_, i) => i);
const set_8 = new Set(array_8);

Tests:

array_1
array_1.includes(item_1)
set_1
set_1.has(item_1)
array_2
array_2.includes(item_2)
set_2
set_2.has(item_2)
array_4
array_4.includes(item_4)
set_4
set_4.has(item_4)
array_8
array_8.includes(item_8)
set_8
set_8.has(item_8)