How to Use a Callback Function in JavaScript

A callback is a function passed as an argument to another function, which is then called inside the outer function. It's a common pattern for asynchronous programming, event handling, and customizing behavior. 

Syntax Example:

What’s Happening:

1. doTask is a function that accepts a callback.
2. After simulating some work (setTimeout), it calls callback().
3. onComplete is passed in and gets executed after the task finishes.

Use this pattern to keep your code modular and responsive