A Beginner’s Guide to JavaScript Callbacks

A callback function is a regularly used concept in full-stack development. I thought of sharing my way of approaching this technique. By the end of the article, you will understand the basics of JavaScript’s callback functions, when to use them, and existing applications that use callbacks.

Please let me know if you have any questions or if you feel that I missed something. I am more than willing to help and share knowledge with everyone :).

Believe me, JavaScript callbacks are not that complicated to understand. A callback function is a way of passing functions to another function as a parameter.

Callback functions can help in code reuse and generate code with lesser bugs. Most of the JavaScript libraries use callbacks. If you know this concept, it’s easy for you to understand.

I think most of you have written or at least read or modified a function. Think of a function that adds two numbers. We can pass the two numbers to that function as parameters. So in JavaScript, you also can pass another function as a parameter. So we use functions as arguments.

How is it possible to pass functions as arguments in JavaScript?

In JavaScript, functions are considered as first-class objects. So, they have all the properties of other objects such as Numbers and Strings. So they can be passed as arguments to functions in the same way as strings and numbers.

The confusing part is there are different ways to pass functions as arguments. Different ways to do the same thing. We can pass the entire function implementation anonymously as a parameter or only the name of that function, a reference of that function, and so on.

So let’s have look at the different ways this technique is used so that you will not get confused in the future.

View the Full Medium tutorial for free using the below link


Leave a Reply

Your email address will not be published. Required fields are marked *