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JavaScript Array isArray() Method

  • Last Updated : 23 Jun, 2020

Below is the example of the Array isArray() method.

  • Example:




    <script>
        // JavaScript code for isArray() function
        function func() {
            document.write(Array.isArray('foobar'));
        }
      
       func();
    </script>
  • Output:
    false

The arr.isArray() method determines whether the value passed to this function is an array or not. This function returns true if the argument passed is array else it returns false.

Syntax:

Array.isArray(obj)

Parameters: This method accept a single parameter as mentioned above and described below:

  • obj: This parameter holds the object that will be tested.

Return value: This function returns the Boolean value true if the argument passed is array otherwise it returns false.



Below example illustrate the Array isArray() method in JavaScript:

  • Example 1: Since the argument passed to the function isArray() is an array therefore this function returns true as the answer.
    Input : print(Array.isArray(['Day','Night','Evening']));
    Output: true
    
  • Example 2: Since the argument passed to the function isArray() is a map therefore this function returns false as the answer.
    Input : print(Array.isArray({foo: 123}));
    Output: false
    
  • Example 3: Since the argument passed to the function isArray() is a string therefore this function returns false as the answer.
    Input : print(Array.isArray('foobar'));
    Output: false
    

Code for the above method is provided below:

Program 1:




<script>
    // JavaScript code for isArray() function
    function func() {
        document.write(Array.isArray(['Day','Night','Evening']));
    }
    func();
</script>

Output:

true

Program 2:




<script>
    // JavaScript code for isArray() function
    function func() {
        document.write(Array.isArray({foo: 123}));
    }
    func();
</script>

Output:

false

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

  • Google Chrome 5.0
  • Microsoft Edge 9.0
  • Mozilla Firefox 4.0
  • Safari 5.0
  • Opera 10.5



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