What is callback hell in programming?

Can you explain what callback hell is in programming?

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

Why is it a problem to have nested callbacks?

Nested callbacks can lead to code that is hard to follow, often referred to as 'pyramid of doom' due to its structure.

How can I avoid callback hell in my code?

You can avoid callback hell by using Promises, async/await syntax, or modularizing your code into smaller functions.

Can you give me an example of callback hell?

Sure! Here's a simple example:

function first(callback) {
    setTimeout(() => {
        callback('First done');
    }, 1000);
}

function second(callback) {
    setTimeout(() => {
        callback('Second done');
    }, 1000);
}

first(result => {
    console.log(result);
    second(result => {
        console.log(result);
    });
});