Run results for: set.has vs. array.includes vs obj[key] vs map.get

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

set

26.8M/s

map

26.8M/s

hash

26.7M/s

includes

23.4M/s

View exact numbers

Test name	Executions per second
✓ set	26,809,684 Ops/sec
map	26,801,642 Ops/sec
hash	26,740,848 Ops/sec
includes	23,392,230 Ops/sec

Script Preparation code:

var a = Array(10000).fill(undefined).map((_, i) => i);
var b = a.reduce((acc, el) => { acc[el] = true; return acc }, {});
var c = new Set(a);
var d = new Map(a.map(el => [el, true]));

Tests:

includes
return a.includes(9)
hash
return b['9']
set
return c.has(9)
map
return d.get(9)