Empty Functions in JavaScript

An “empty” function in JavaScript is one that has no statements or executable code inside of its function body. Empty functions can be helpful as placeholders for future-implemented functions or as default functions to avoid errors if a function call is made when no action is needed.

What are Empty Functions in JavaScript?

A function that has no statements or instructions inside of its body is said to be an “empty function” in JavaScript. For defining an “empty function”, the “function” keyword, empty pair of parentheses, and an empty pair of curly braces are used.

How to Define Empty Functions in JavaScript?

The following syntax is utilized for creating an empty function:

function emptyFunction() {

// no statement or instructions



const emptyFunction = () => {

// no statement or instructions


Use Case Scenarios of Empty Functions in JavaScript

Empty functions can be useful in various situations, such as:

  • Developers may want to define a function but do not yet have an actual implementation. So, they have to use the empty function as a placeholder and then add the implementation details later.
  • Sometimes, developers need a function that does nothing while defining event handlers for elements. So, they utilize the empty function as a placeholder for the element’s event attribute until the actual functionality is not added.
  • While defining an object, developers may want to include a default function as one of the properties of the object. For this, an empty function can be utilized as a temporary replacement for the default function until it is replaced with a new implementation.

Example: Add Empty function to Handle Event

Here, we will handle the click event of the button using the empty function as a placeholder that will be implemented later for any specific task.

First, define an empty function “buttonClick()” to handle the button’s click event:

function buttonClick() {}

Now, access the button by getting its reference using the assigned id:

const button = document.getElementById("btn");

Then, assign the empty function “buttonClick()” to the click event of the button:

button.onclick = buttonClick;

The above code helps to handle the click event to avoid errors.

Empty JavaScript functions

I’m just wondering about what the lines ‘function Animal() { }’ and ‘function Bird() { }’ are for when the functions are wrapping anything?

function Animal() { }
Animal.prototype.eat = function() {
  console.log("nom nom nom");
function Bird() { }
Bird.prototype = Object.create(Animal.prototype);
Bird.prototype.constructor = Bird;

Think of Animal as the pattern, the “blueprint” used to create each instance of Animal. Defining the function of telling Javascript what to do when we say

const octopus = new Animal();

The function simply defines the shape of that new thing, the instance of our constructor. An empty function creates an empty object (no properties) that is wired to the constructor’s prototype. Doing this, the instance can use any of those prototype methods or properties.

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Bringing Code Cleanup on Save To Visual Studio 2022 

evelopers can now perform Code Cleanup automatically when a file is being saved! Code Cleanup automatically on Save is a new feature integrated into Visual Studio 2022 that can clean up your code file to make sure it is formatted correctly and that your coding style preferences are applied. Some customizable preferences include: format document, sort usings, remove unnecessary usings, and more. This feature can help minimize stylistic violations within PRs and more to allow developers to spend less time fixing code not meeting specific standards and more time doing what they do best.

How to enable Code Cleanup on Save

First, navigate to Analyze > Code Cleanup > Configure Code Cleanup to personalize desirable customizations to your code cleanup profile(s).

Next, navigate to Tools > Options > Text Editor > Code Cleanup. Add a check in the “Run Code Cleanup profile on Save”. Be sure to select the appropriate profile you want to execute automatically whenever you save!

Try it out and share your feedback!

We would love to get your feedback on Code Cleanup on Save so please give it a try and let us know what you think! You can share any feedback via Developer Community to help us make Visual Studio better for you!

Development-time IIS support in Visual Studio for ASP.NET Core


  • Visual Studio for Windows
  • ASP.NET and web development workload
  • .NET Core cross-platform development workload
  • X.509 security certificate (for HTTPS support)

Enable IIS

  1. In Windows, navigate to Control Panel > Programs > Programs and Features > Turn Windows features on or off (left side of the screen).
  2. Select the Internet Information Services checkbox. Select OK.

The IIS installation may require a system restart.

Configure IIS

IIS must have a website configured with the following:

  • Host name: Typically, the Default Web Site is used with a Host name of localhost. However, any valid IIS website with a unique host name works.
  • Site Binding
    • For apps that require HTTPS, create a binding to port 443 with a certificate. Typically, the IIS Express Development Certificate is used, but any valid certificate works.
    • For apps that use HTTP, confirm the existence of a binding to port 80 or create a binding to port 80 for a new site.
    • Use a single binding for either HTTP or HTTPS. Binding to both HTTP and HTTPS ports simultaneously isn’t supported.

Read more here

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