1. Web
  2. JavaScript
  3. Reference
  4. Standard built-in objects
  5. Array
  6. includes()

Array.prototype.includes()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since August 2016.

The includes() method of Array instances determines whether an array includes a certain value among its entries, returning true or false as appropriate.

Try it

const array = [1, 2, 3];

console.log(array.includes(2));
// Expected output: true

const pets = ["cat", "dog", "bat"];

console.log(pets.includes("cat"));
// Expected output: true

console.log(pets.includes("at"));
// Expected output: false

Syntax

js
includes(searchElement)
includes(searchElement, fromIndex)

Parameters