JavaScript Array includes() Method

The includes() method returns true if an array contains a specified value. Conversely, it returns false if the value is not found. This method simplifies checking for the presence of an element within an array, providing a straightforward 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 1: Searching for number in an array

Here, the method will search for element 2 in that array.

// 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

Here, the method will search for the element ‘cat’ in that array and returns false as ‘cat’ is not present in the array.

// 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
• Internet Explorer 
• Firefox
• Opera
• Safari