JavaScript Array includes() Method

The includes() method in JavaScript returns true if an array contains a specified value, and false if the value is not found. This method simplifies checking for the presence of an element within an array, offering a quick and efficient way to return a boolean result.

Syntax

array.includes(searchElement, start);

Parameters

• searchElement: This parameter holds the element that will be searched.
• start: This parameter is optional and it holds the starting point of the array, where to begin the search the default value is 0.

Return Value :It returns a Boolean value i.e., either True or False.

Example of JavaScript Array includes() Method

Here’s an example of the JavaScript Array.includes() method:

Example 1: Searching for a number in an array

In this example, the includes() method checks if the number 2 is present in the array A.

// Taking input as an array A
// having some elements.
let A = [1, 2, 3, 4, 5];

// includes() method is called to
// test whether the searching element
// is present in given array or not.
a = A.includes(2)

// Printing result of includes().
console.log(a);

true

Example 2: Searching for a string in an array

In this example, the includes() method checks if the string 'cat' is present in the array name. Since 'cat' is not in the array, it returns false.

// Taking input as an array A
// having some elements.
let name = ['gfg', 'cse', 'geeks', 'portal'];

// includes() method is called to
// test whether the searching element
// is present in given array or not.
a = name.includes('cat')

// Printing result of includes()
console.log(a);

false

We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete referencearticle.

Supported Browsers

• Google Chrome
• Edge
• Firefox
• Opera
• Safari