Compare arrays using Array.prototype.every() in JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

We are required to write a JavaScript function that takes in two arrays of literals. Then our function should return true if all the elements of first array are included in the second array, irrespective of their count, false otherwise.

We have to use Array.prototype.every() method to make these comparisons.


The code for this will be −

const arr1 = [0, 2, 2, 2, 1];
const arr2 = [0, 2, 2, 2, 3];
const compareArrays = (arr1, arr2) => {
   const areEqual = arr1.every(el => {
      return arr2.includes(el);
   return areEqual;
console.log(compareArrays(arr1, arr2));


And the output in the console will be −

Updated on 20-Nov-2020 10:09:25