Collect.js is a fluent and convenient wrapper for working with arrays and objects. The JavaScript array is first transformed into a collection and then the function is applied to the collection.
The crossJoin() method cross joins the collection with an array or collection and return all possible permutations between them.
Installation:
- Collect.js can be installed via NPM:
npm install --save collect.js
- You can also use CDN of collect.js
<script src="https://cdnjs.com/libraries/collect.js"></script>
Syntax:
collect(array1).crossJoin(array2)
Parameters: The collect() takes one argument that is converted into the collection and then crossJoin() function also take an array.
Return Value: Returns an array with all possible permutation of between them.
Below example illustrate the crossJoin() method in JavaScript:
Example: Here collect = require(‘collect.js’) is used to import the collect.js library into the file.
const collect = require('collect.js'); Â Â let numbers = [1, 2, 3, 4] Â Â let alphabets = ['a', 'b', 'c', 'd'] Â Â // covert into collection const collection = collect(numbers); Â Â const permutations = collection.crossJoin(alphabets) Â Â // returning the permutations let arr =Â permutations.all(); Â Â console.log("Permutations: ", arr); |
Output
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