How to pass a function as parameter in JavaScript ?

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There are times when you might want to pass a function as argument to another function in JavaScript. The function keyword can work in multiple ways. It can act as a operator and a statement as well. Additionally , you can create an expression as well.

How to pass a function as parameter in JavaScript ?

We can pass a function as a parameter to another function as named variable and sometimes as parameters.

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Below is a sample code snippet demonstrating the passing of function as parameter in JavaScript.

<script type="text/javascript">       
    function MainFunction(param1, param2, param3) {
        // param1 is the name of the function
        param1(param2, param3); 
    var param = function(param1, param2) {
         alert(param1 + " " + param2);

    // Calling the main function
    MainFunction(param, "Welcome to ", "");

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