Callback Function💡

In JavaScript, a callback is a function that is passed as an argument to another function and is intended to be executed after the completion of that function. Callbacks are a fundamental concept in asynchronous programming, allowing you to define what should happen once a particular task or operation is finished.

Here we start from a basic way..........

Imagine you have a friend, and you ask your friend to do something for you, like bringing you a cup of coffee. After your friend is done, they let you know by calling or texting you. In this situation:

You are the main program or function. Your friend is the callback function. In programming, a callback is similar. It's like asking a function to do something for you, and once it's done, the function tells you by calling another function, which we call the "callback" function.

Here's a simple analogy:

Imagine this as your friend (callback function)

// Imagine this as your friend (callback function)
function bringCoffee() {  
console.log("Here's your coffee!");
}

// This is you (main program)
function askFriendToDoSomething(callback) {
  console.log("Asking a friend to do something...");
  // Pretend your friend is doing something here
  // In this case, it's just waiting for 2 seconds using setTimeout
  setTimeout(callback, 2000);
}

// You ask your friend (callback) to bring coffee
askFriendToDoSomething(bringCoffee);

When you run this code, you'll see:

Asking a friend to do something...
Here's your coffee!

In this example:

You have a function called askFriendToDoSomething, which takes a callback function as an argument (like asking your friend to do something for you).
The askFriendToDoSomething function just pretends to do something by using setTimeout (imagine your friend waiting for 2 seconds).
After 2 seconds, it calls the callback function (bringCoffee), which is like your friend telling you, "Here's your coffee!"

So, callbacks are just a way to pass functions as arguments to other functions and execute them when needed. They are commonly used in JavaScript for handling asynchronous operations, like fetching data from a server, reading files, or any task that takes some time to complete.

Callback Function💡

callbacks in the easiest way possible