How to check if an array includes a value in JavaScript

In this tutorial, we are going to learn about how to check if an array includes a specific value or item in JavaScript with the help of examples.

Using Array.includes() method

To check if an array includes a specific value or not, we can use the Array.includes() method in JavaScript.

The Array.includes() method takes the value as an argument and returns true if a value is found in the array else it returns false.

Here is an example:

const arr = ['sun','moon','fun'];

console.log(arr.includes('sun')); // true
console.log(arr.includes('king')); // false

Similarly, you can also use the indexOf() method where it returns the index of a specified element if it is found in the array or it returns -1 if it is not found.

Example:

const arr = ['sun','moon','fun'];

console.log(arr.indexOf('moon')); // 1
console.log(arr.indexOf('king')); // -1