jQuery | contains() Method

JQuery | isFunction() method

Last Updated : 27 Apr, 2020

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.

html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JQuery | isFunction () method</title> 
<script src="https://code.jquery.com/jquery-3.4.1.js"></script>

</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.

html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JQuery | isFunction () method</title> 
<script src="https://code.jquery.com/jquery-3.4.1.js"></script>

</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:

jQuery | contains() Method

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