Callback Functions in Java Script

Khushi Turakhia

— 1 min read
Callback Functions in Java Script

JavaScript is a language that handles multiple tasks simultaneously. This implies that JavaScript is an asynchronous programming language. Callbacks are a type of function that are a fundamental aspect of JavaScript. In this blog, we’ll look at what callbacks are, why they’re used, and how to use them with examples.

What are Callback Functions?

  • A callback is a function that is passed as an argument to another function.
  • A callback allows you to run code after an asynchronous operation has been completed.
  • Callbacks are called after the main function has finished its execution.
  • The function in which callback is passed as a parameter is called a main function.

Why are Callback functions used?

  • Callbacks allow you to continue executing code while the operation is being executed in the background.
  • When the main function finishes it calls the callback function to provide us with the obtained results.
  • Callback in this way helps you to ensure that the program remains responsive and the user experience is not impacted.

Example of a callback function:

Output or the above callback function is :

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