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JavaScript Array includes() Method

  • Last Updated : 08 Jul, 2020
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Below is the example of the Array includes() method.

  • Example:




    <script>
        var name = [ 'gfg', 'cse', 'geeks', 'portal' ];
      
        a = name.includes('gfg')
      
        // Printing result of includes()
        document.write(a);
    </script>
  • Output:
    true

The array.includes() method is used to know either a particular element is present in the array or not and accordingly, it returns true or false i.e, if the element is present, then it returns true otherwise false.

Syntax:

array.includes(searchElement, start)

Parameter: This method accepts two parameters as mentioned above and described below:

  • searchElement: This parameter holds the element which 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.



Below examples illustrate the Array includes() method in JavaScript:

  • Example 1: In this example the method will searched for the element 2 in that array.
    Input : [1, 2, 3, 4, 5].includes(2);
    Output: true
  • Example 2: In this example the method will searched for the element 9 in that array.
    Input : [1, 2, 3, 4, 5].includes(9);
    Output: false

Code for the above method is provided below:

Program 1:




<script>
  
    // Taking input as an array A
    // having some elements.
    var 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().
    document.write(a);
</script>

Output:

true

Program 2:




<script>
    // Taking input as an array A
    // having some elements.
    var 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()
    document.write(a);
</script>

Output:

false

Supported Browsers: The browsers supported by JavaScript Array includes() method are listed below:

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

Hey geek! The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. But before you tackle the big projects, we suggest you start by learning the basics. Kickstart your web development journey by learning JS concepts with our JavaScript Course. Now at it’s lowest price ever!




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