JavaScript Call Functions: Ways to Call a Function in JavaScript

One of the first things you learn when you start out as a developer is how to call a function. You can arrange related code together with the help of functions, which are a crucial component of programming. However, JavaScript allows you multiple ways to call functions. That can appear to be an incorrect statement at first. This is why many students fail to understand JavaScript Call Functions when doing JavaScript programming-related tasks. Therefore, in this blog, we will discuss how to call a function in JavaScript.

One of the key pillars of JavaScript programming is the concept of functions. Although it is conceptually easy. However, there are a few tips and tactics you can use to make using JavaScript Function call simpler and more natural. So, keep reading this blog of Java Homework Help to ways through which you can call a function in JavaScript and perform the action.

JavaScript Call Functions: An Overview

To create methods for various objects, one can use the default JavaScript call Functions method. The owner object is used as a parameter when calling the method. This is a keyword that denotes the “owner” of the function or the object that it is associated with. The term “object method” refers to all functions in Javascript. By utilizing “call(),” we can connect a function to a specific object. If a function is not regarded as a method of a JavaScript object, it will be a global object.

JavaScript always passes two implicit arguments no matter how a function is called. These two implicit parameters are the context in which the function will run and the arguments parameter. Any passed arguments are contained in the array-like structure known as the arguments parameter. It is “array-like,” but it is not an array.

Now, let’s quickly go over the ways a function can be called in JavaScript.

Read Here: JavaScript Programming: How And Why to Learn?

How to Call a Function in JavaScript?

In JavaScript, calling a function (also known as a method) is equivalent to calling one in any other programming language with a syntax like C. Call the function directly by name, then include any necessary arguments in a list separated by commas and enclosed in brackets. Seems difficult to o understand? Need JavaScript Homework Help to understand the JavaScript Call Functions? Don’t worry. For your better understanding, the four methods that function in JavaScript is called are listed below.

JavaScript functions can be called:

  • As a function
  • Method
  • Constructor
  • Via call and apply

Now, let’s look at each one.

Calling a Function as “Function”

Any function can be called a function itself in any programming language, which is the most popular and often used method. A “function” is what you get when you put some code in a place and have it run every time a button is pressed.

A JavaScript function has been called as a function if it has ever been referenced from a button click while embedded in a web page. Let’s examine some code.

Click the button to say Hello
<button onclick="GreetingFunc()">Say Hello!!</button>

<p id="div"></p>


  function GreetingFunc() {

    document.getElementById("div").innerHTML = "Hello there?"



The sayHello() method is called by a button in this straightforward piece of code. We log the value of this within the function, followed by the arguments’ values. Then we introduce ourselves. Check out what happens when we press the button in the console.

JavaScript Object Method

You can create JavaScript objects with their own attributes and methods as you start to become more object-oriented (complete JavaScript OOP is a topic for another article). These processes also function. When directly invoked, they have access to the object via the “this” keyword since they are resident on the object. The object and its properties can be referred to using the “this” keyword.

Here is an illustration of defining a JavaScript object with several properties and methods:

// object definition
var author = {
firstName: "Chris",
lastName: "Pietschmann",
favoriteNumber: 2063,
getFullName: function () {
    return this.firstName + " " + this.lastName;
<!-- wp:paragraph -->
<!-- /wp:paragraph -->

<!-- wp:paragraph -->
<p>// call the getFullName method on the object<br>var fullName = author.getFullName();<br>// return value is "Chris Pietschmann"</p>
<!-- /wp:paragraph -->

The call() function can be used to call the methods of a JavaScript object that has its own attributes and methods. By passing the context for the “this” keyword within the function, as well as any necessary parameters, you can call a function using the call() method. This gives you the ability to specify the scope of the “this” keyword for the method’s object reference.

Calling a Function as Constructor

Constructors in JavaScript are used to build objects or initialize a state and set it in an object. A unique technique to send some inputs and get a unique outcome for each input is to call a function as a function constructor() { [native code] }. Given that, this is a more specific example of calling a function. The purpose of calling this function is to produce something new and obtain it again.

In the example below, users type their names into an input box, and when they click a button, the method “GreetingFunc()” is called. Within that function, the content of the input text box is acquired using the id supplied to the input text field.

<p>Click the button for greetings</p>

<button onclick="GreetingFunc()">Here for greetings?</button>

<p id="div"></p>


    function hello(name) { = name;


    function GreetingFunc() {

        var name = document.getElementById('name').value;

        var greet = new hello(name);

        document.getElementById("div").innerHTML = "Hello "+



The term “new” indicates that the function is being used as a function Object() { [native code] }, and it saves the value to the variable greet, which is then used to print the name on the screen. However, if you are unable to understand this JavaScript call function, you may take assistance from a Java Programming Help professional as well.

Calling a Function via Call and Apply

When working with JavaScript functions, it’s important to remember that each function may have unique attributes and methods, with the call() and apply() being two instances. Through “this” values, both of these methods let the user choose the content in which they want to perform the function.

When the value is supplied inside the call() method, the information about two people is kept and displayed in the example below. The first person’s name is displayed in this case by calling the fullName function.


const personFunc = {

fullName: function() {

return this.firstName + " " + this.lastName;

<!-- wp:paragraph -->
<!-- /wp:paragraph -->

<!-- wp:paragraph -->
<!-- /wp:paragraph -->
const firstPerson = {


lastName: "Andrew"
const secondPerson = {


lastName: "Andrew"
document.getElementById("div").innerHTML =;


Similar to calling a function, the apply() method accepts an array rather than a list of values as the call() method does. This method of a function call is not easy to understand. Therefore, we suggest you take Java Assignment Help Online or help with JavaScript from expert professionals.

Also Read: Java and JavaScript: Know The Differences

When Should You Call a Function in JavaScript?

Really, there isn’t a clear answer to this query. It relies on your coding structure and the goals you have for it. But, a solid rule of thumb is to use functions if you need to run a certain section of code repeatedly or whenever you need to carry out a task that can be abstracted away into a function.

Consider the case of a website having a navigation bar. There are a few distinct links in the navigation bar, each of which opens a different webpage on the website. You must update the URL in the browser’s address bar and load the new page when a user clicks one of the links.

You might abstract this logic into a function rather than writing it out again for each link. When a user clicks on a link, all you would have to do is call the method. This would make your code easier to maintain and more DRY (Don’t Repeat Yourself).


Although initially calling JavaScript functions appears to be straightforward. You can see that there are a variety of functional programming strategies that may be applied. The expertise to develop better JavaScript code comes from a greater understanding that a JavaScript Function is an object.

In this blog, we covered four different JavaScript call functions each with an example and working code. Any developer can benefit from all four of these methods. But it is important to understand how “this” is used when dealing with functions. However, if students face difficulties in executing these methods, then they can ask for help from us. They can simply say us to do my java project or help me with my JavaScript call functions online.


Q: What does a function in JavaScript mean?
A: Every programming language needs functions because they allow for the reuse of code, which is a highly significant aspect. Whenever a function is called, a block of code inside of it will be run. You can build a function that contains the repeating lines of code if you have a few lines of code that need to be used multiple times and then call the function from any location.
Q: What is Anonymous Function in JavaScript?
A: We can define a function in JavaScript without giving it a name. The name of this unnamed function is anonymous function. A variable must be given the anonymous function.

By Mark Watson

Mark Watson is a professional java programmer working with top MNC based out in the US. Mark watson likes to help students with java programming and with years of experience, he has been top rated java expert on our platform.