Check if an array contains all the elements of another array in JavaScript

Today we’ll show you how to check if an array contains all the elements of another array in JavaScript.

In the previous article, we have explained to check if an array contains any element of another array in JavaScript.

Let’s assume that we have two arrays called `array1` and `array2`. Now if we want to check if `array2` contains all the elements of `array1` then we have several ways to verify that. But we will see the best of them.

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Here, we will use the every() method to tests whether all elements in the array pass the test implemented by the provided function. It returns a Boolean value.

const array1 = ['val_1', 'val_2', 'val_3'];
const array2 = ['val_1', 'val_3', 'val_2', 'val_23'];
const array3 = ['val_28', 'val_74', 'val_21'];

const isValidArray2 = array1.every(x => array2.includes(x));
const isValidArray3 = array1.every(x => array3.includes(x));

console.log(isValidArray2); // true
console.log(isValidArray3); // false

That’s it for today.
Thank you for reading. Happy Coding..!! 🙂