Callback functions

Background

Let’s plunge into the depths of writing asynchronous code. Our exploration begins with callbacks.

What are callback functions?

When every asynchronous event is complete, we want a certain task or action to occur. Because the event loop can populate our call stack with functions from the callback queue, add callback functions to the events. These functions are added to the queue when the event ends. Callback functions are functions called after the asynchronous event ends. They can use data from the asynchronous events, but primarily their objective is to carry out tasks meant to be done after the event ends.

Asynchronous functions and callbacks

Let’s go over some examples of asynchronous functions and added callback functions.