ES6 Callback function

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by vsasikalabe dot icon Updated: Mar 24, 2023

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A JavaScript callback is a function executed after another function is executed. In this method, the function is passed as an argument. This argument is passed to another function so that it can be executed when another function is called a callback function. 

Many JavaScript actions are asynchronous, so we need callback functions. It only stops the function of a program from running once they are completed. It will execute in the background meanwhile the rest of the code runs. The main purpose of a callback function is to execute code for an event. These events are user-initiated, such as mouse clicks or typing. With a callback function, you may instruct your application to execute this code whenever the user wants to use it.  

Instead of calling it, we can define a function directly inside another function. In JavaScript, the callback function here has no name, and a function definition without a name is called an “anonymous function”. Sometimes you want better control over the execution of a function. For example, you want to calculate and display the result. You could call a calculator function, save the result, and then call another function to display the result. We use callback functions and promise to implement asynchronous code in JavaScript. A callback function is passed as an argument to another function, whereas Promise is achieved or completed in the future. 

Here is an example of how to do ES6 Callback Functions: 

Preview of the output that you will get on running this code from your IDE.



Follow the steps carefully to get the output easily.

  1. Download and Install VS Code on your Computer.
  2. Open the VS Code and install Javascript ES6 Code Snippet and Code Runner from Extensions.
  3. Open the new file and save it as example.js (functions.js)
  4. Copy the code using the "Copy" button above, and paste it into your Javascript file.
  5. Run the code using (ctr+alt+N) Run button.

I hope you found this useful. I have added version information in the following sections.

I found this code snippet by searching for ' ES6 Callback function ' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in VS Code 1.73.1 version.
  2. JavaScript (ES6) code snippets v1.8.0
  3. Code Runner v0.12.0

Using this solution, we are able to do the ES6 Callback function with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to do the ES6 Callback function.


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