Open In App

JQuery | isFunction() method

Improve
Improve
Like Article
Like
Save
Share
Report

This isFunction() Method in jQuery is used to determines if its argument is callable as a function.

Syntax:

jQuery.isFunction( value )

Parameters: The isFunction() method accepts only one parameter that is mentioned above and described below:

  • value : This parameter is the value to be tested.

Return Value: It returns the boolean value.

Below examples illustrate the use of isNumeric() method in jQuery:

Example 1: In this example, the isFunction() method checks an value to see if it’s a Function.




<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JQuery | isFunction () method</title
  
</head>
<body style="text-align:center;"
      
    <h1 style="color: green"
        GeeksForGeeks 
    </h1
      
    <h3>JQuery | isFunction () method</h3>
    <b>Check the function() {} is a function or not. </b>
    <br>
    <p></p>
    <script>
      
    //function() {}
    $( "p" ).append("" +$.isFunction(function() {}));
      
    </script>
</body>
</html>                                                            


Output:

Example 2: In this example, the isFunction() method also checks an value to see if it’s a Function.




<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JQuery | isFunction () method</title
  
</head>
<body style="text-align:center;"
      
    <h1 style="color: green"
        GeeksForGeeks 
    </h1
      
    <h3>JQuery | isFunction () method</h3>
    <b>Check the following are the function or not. </b>
    <br><br>
    <div>jQuery.isFunction( geeks[ 0 ] ) = <span></span></div>
    <div>jQuery.isFunction( geeks[ 1 ] ) = <span></span></div>
    <div>jQuery.isFunction( geeks[ 2 ] ) = <span></span></div>
  
    <script>
        function stub() {}
        var geeks = [
          function() {},
          { x:15, y:20 },
          null,
          stub,
          "function"
        ];
           
        jQuery.each( geeks, function( i ) {
          var isFunc = jQuery.isFunction( geeks[ i ]);
          $( "span" ).eq( i ).text( isFunc );
        });
    </script>
</body>
</html>                                                                                                        


Output:



Last Updated : 27 Apr, 2020
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads