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In the world of JavaScript, asynchronous programming is a fundamental concept that allows developers to create dynamic and responsive applications. One of the most common techniques for handling asynchronous operations is the use of callback functions.
Callback-based APIs have been a staple in JavaScript for years, and understanding them is crucial for building robust and scalable applications.
What are Callbacks?
A callback function is a function that is passed as an argument to another function and is executed after some operation has been completed. This is particularly useful in asynchronous programming, where operations can take an unpredictable amount of time to complete.
Instead of waiting for the operation to finish, the program can continue executing other tasks, and the callback function is invoked when the operation is done.
Example: SetTimeout Let’s start with a simple example using the built-in setTimeout function, which executes a callback function after a specified delay:
function greetingAfterDelay(name, delay) {
setTimeout(function() {…
