Run results for: set.has vs. array.includes on big arr

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.71 Safari/537.36

Browser: Chrome 94

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
includes	910.9 Ops/sec
lookup	9279.6 Ops/sec
transform to obj	2963.4 Ops/sec

Script Preparation code:

var arr1 = Array.from({
    length: 1000
}, (_, i) => i + 1)

var arr2 = Array.from({
    length: 1000
}, (_, i) => i * 1000)

var set1 = new Set(arr1)
var set2 = new Set(arr2)

Tests:

includes
return arr2.filter(x => arr1.includes(x))
lookup
return [...set2].filter(x => set1.has(x))
transform to obj
const obj1 = arr1.reduce((acc,val) => ({...acc, [val]: true }), {}) return arr2.filter(x => !!obj1[x])

Run results for: set.has vs. array.includes on big arr

includes

lookup

transform to obj