How to Compare Two Arrays in Javascript

In this post, we compare two arrays, We have many simple ways to do this task in Javascript.

#1: Get the difference between two arrays in JavaScript?

To get the difference between two arrays we can use a Filter() function of javascript.

The filter() the method creates a new array with all elements that pass the test implemented by the provided function.

let arrA = ['a', 'b'];
let arrB = ['a', 'b', 'c', 'd'];


let difference = arrA.filter(x => !arrB.includes(x)).concat(arrB.filter(x => !arrA.includes(x)));


console.log(difference);

Result

['c', 'd']

#2: Get the common or intersection elements of two arrays in JavaScript?

To get the difference or intersection between two arrays we can use a Filter() function of javascript.

let arrA = ['a', 'b'];
let arrB = ['a', 'b', 'c', 'd'];



let intersection = arrA.filter(x => arrB.includes(x)); 



console.log(intersection);

Result

['a', 'b']