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Passing a function as a parameter in JavaScript
  • Last Updated : 02 May, 2019

Passing a function as an argument to the function is quite similar to the passing variable as an argument to the function. Below examples describes to passing a function as a parameter to another function.

Example 1: This example passes a function geeks_inner to the function geeks_outer as an argument.




<!DOCTYPE html> 
<html
    <head
        <title
            JavaScript | Pass a function as parameter 
        </title
    </head
      
    <body style = "text-align:center;"
          
        <h1 style = "color:green;"
            GeeksForGeeks 
        </h1
          
        <p
            Passing function as arguments. 
        </p
          
        <!-- Function call after clicking the button -->
        <button onclick = "geeks_outer(geeks_inner)"
            Click Here 
        </button>     
          
        <script
            function geeks_inner(value){
                return 'hello User!';
            }
            function geeks_outer(func){
                alert(func());
            }
        </script
    </body
</html>                    

Output:

  • Before clicking on the button:
  • After clicking on the button:

Example 2: This example passes a function geeks_inner alongwith a argument ‘Geeks!’ to the function geeks_outer as a argument.




<!DOCTYPE html> 
<html
    <head
        <title
            JavaScript | Pass a function as parameter 
        </title
    </head>     
      
    <body style = "text-align:center;"
          
        <h1 style = "color:green;"
            GeeksForGeeks 
        </h1
      
        <p
            Passing function as arguments. 
        </p>             
          
        <button onclick = "geeks_outer('Geeks!', geeks_inner)"
            Click Here 
        </button>         
          
        <!-- Script to uses function call using
            function as argument -->
        <script
            function geeks_inner(value){
                return 'hello '+value;
            }
            function geeks_outer(a, func){
                alert(func(a));
        }         
        </script
    </body
</html>                    

Output:

  • Before clicking on the button:
  • After clicking on the button:

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