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Check if a value exists in an array using Javascript.

Murtaja Ziad
A Full-Stack Web Developer.
Originally published at blog.murtajaziad.xyz on ・1 min read

In this article, I will show you the 2 ways for checking if a value exists in an array.


Photo by Luis del Río from Pexels


1. Using includes()

This method returns true if the array includes the value, else it returns false.

let array = ["a", "b", "c", "d"];
console.log(array.includes("b")); // true
console.log(array.includes("e")); // false
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2. Using indexOf()

This methods returns the index of the value if it exists, else it returns -1.

let array = ["a", "b", "c", "d"];
console.log(array.indexOf("b")); // 1
console.log(array.indexOf("e")); // -1
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