What is callback hell in JavaScript?

What is callback hell in JavaScript?

Callback hell refers to the situation where multiple nested callbacks make code difficult to read and maintain.

Can you give me an example of callback hell?

Sure! Here's a simple example:

function firstFunction(callback) {
    // some code
    callback();
}

firstFunction(function() {
    secondFunction(function() {
        thirdFunction(function() {
            // more nested callbacks
        });
    });
});

How can I avoid callback hell?

You can avoid callback hell by using Promises or async/await syntax, which makes the code more readable.

What are Promises in JavaScript?

Promises are objects that represent the eventual completion (or failure) of an asynchronous operation and its resulting value.