Run results for: Join an Array with another Array vs an Object vs a Map

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36

Browser: Chrome 99

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Join an Array with an Array	0.3 Ops/sec
Join an Array with an Object	107.8 Ops/sec
Join an Array with a Map	101.8 Ops/sec

Script Preparation code:

const entries = Array(50000).fill('').map((_, index) => [`entry ${index}`, 'value'])

window.array = [...entries]
window.object = Object.fromEntries(entries)
window.map = new Map()

entries.forEach(([key, value]) => {
	window.map.set(key, value)
})

window.reversedArray = window.array.reverse()

Tests:

Join an Array with an Array
const result = window.reversedArray.filter(([keyA])=> window.array.find(([keyB]) => keyA === keyB) !== undefined) if (result.length !== window.reversedArray.length) { throw new Error('Test case failed') }
Join an Array with an Object
const result = window.reversedArray.filter(([keyA]) => window.object[keyA] !== undefined) if (result.length !== window.reversedArray.length) { throw new Error('Test case failed') }
Join an Array with a Map
const result = window.reversedArray.filter(([keyA]) => window.map.get(keyA) !== undefined) if (result.length !== window.reversedArray.length) { throw new Error('Test case failed') }

Run results for: Join an Array with another Array vs an Object vs a Map

Performs a join between an Array and another Array, or an Object, or a Map. Similar to a join between two tables in a database.

Join an Array with an Array

Join an Array with an Object

Join an Array with a Map