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Collect.js | crossJoin() Method

  • Last Updated : 15 May, 2020
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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');
  
let numbers = [1, 2, 3, 4]
  
let alphabets = ['a', 'b', 'c', 'd']
  
// covert into collection
const collection = collect(numbers);
  
const permutations = collection.crossJoin(alphabets)
  
// returning the permutations
let arr =  permutations.all();
  
console.log("Permutations: ", arr);

Output

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