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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

set_2

102.0M/s

set_1

101.4M/s

set_4

101.3M/s

set_8

99.9M/s

array_1

86.8M/s

array_2

80.7M/s

array_4

74.9M/s

array_8

62.8M/s

View exact numbers

Test name	Executions per second
✓ set_2	101,967,936 Ops/sec
set_1	101,426,552 Ops/sec
set_4	101,318,432 Ops/sec
set_8	99,934,752 Ops/sec
array_1	86,808,112 Ops/sec
array_2	80,654,464 Ops/sec
array_4	74,914,680 Ops/sec
array_8	62,804,416 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)