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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: 4 months ago

Test name	Executions per second
includes	40583344.0 Ops/sec
hash	74624632.0 Ops/sec
set	73848160.0 Ops/sec
map	69494576.0 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)

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

includes

hash

set

map