Learn how to create a callback function in JavaScript and use it for various purposes, such as asynchronous programming, modularity, flexibility, and custom events.

What is callback function in JavaScript? A function which takes another function as an argument and call that function in itself is known as callback function, in other words when we take a function ...

The first example shows unnested callbacks where data is passed by using file globals (basically variables that are defined outside of function scope). To unnest we made the following changes to the ...

Callbacks work well for handling asynchronous code, but they get tricky when you start coordinating multiple asynchronous functions. For example, if we wanted to wait two seconds and log something ...

Learn how to create a callback function in JavaScript and use it for various purposes, such as asynchronous programming, modularity, flexibility, and custom events.