What is the difference between callbacks and promises?

Can you explain the difference between callbacks and promises in JavaScript?

Sure! Callbacks are functions passed as arguments to other functions, executed after a task is completed. Promises, on the other hand, are objects that represent the eventual completion (or failure) of an asynchronous operation and its resulting value.

Why would I use promises instead of callbacks?

Promises help avoid callback hell, making code easier to read and maintain. They also provide better error handling.

Can you give me an example of each?

Of course! A callback example would be using setTimeout to execute a function after a delay. A promise example would be fetching data from an API using fetch(), which returns a promise that resolves with the response.

What happens if a promise is rejected?

If a promise is rejected, it triggers the catch method, allowing you to handle the error gracefully.