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JavaScript Array includes() Method

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The JavaScript Array includes() Method returns true if an array contains a specified value. The includes() method is case-sensitive.

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: In this example, we will see if a value is included in an array or not using the Array includes() method.

javascript

let name = ['gfg', 'cse', 'geeks', 'portal'];
 
a = name.includes('gfg')
// Printing result of includes()
console.log(a);

                    

Output
true

Example 2: In this example, the method will search for element 2 in that array.

javascript

// 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);

                    

Output
true

Example 3: In this example, the method will search for the element ‘cat’ in that array and returns false as ‘cat’ is not present in the array.

javascript

// 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);

                    

Output
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 47.0
  • Microsoft Edge 14.0
  • Mozilla Firefox 43.0
  • Safari 9.0
  • Opera 34.0

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.



Last Updated : 10 Jan, 2024
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