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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.2.1

Device Platform: Mobile

Date tested: one year ago

set_4

508.1M/s

set_1

478.5M/s

set_2

443.1M/s

set_8

345.8M/s

array_1

265.6M/s

array_2

210.4M/s

array_4

151.1M/s

array_8

110.1M/s

View exact numbers

Test name	Executions per second
✓ set_4	508,071,040 Ops/sec
set_1	478,463,520 Ops/sec
set_2	443,106,080 Ops/sec
set_8	345,779,680 Ops/sec
array_1	265,603,824 Ops/sec
array_2	210,363,296 Ops/sec
array_4	151,137,344 Ops/sec
array_8	110,071,272 Ops/sec

Script Preparation code:

const item_1 = Math.floor(Math.random() * 1);
const array_1 = new Array(1).fill(0).map((_, i) => i);
const set_1 = new Set(array_1);

const item_2 = Math.floor(Math.random() * 2);
const array_2 = new Array(2).fill(0).map((_, i) => i);
const set_2 = new Set(array_2);

const item_4 = Math.floor(Math.random() * 4);
const array_4 = new Array(4).fill(0).map((_, i) => i);
const set_4 = new Set(array_4);

const item_8 = Math.floor(Math.random() * 8);
const array_8 = new Array(8).fill(0).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)