Node.js Interview Question: Difference between Callback, Promise, and Async/Await

One common interview question in Node.js involves explaining the difference between callback functions, promises, and async/await in handling asynchronous operations.

Callback Functions: Callbacks are functions that are passed as arguments to other functions to be executed once the operation completes. They are a traditional way of handling asynchronous tasks in Node.js.

Promise: Promises are objects representing the eventual completion or failure of an asynchronous operation. They provide a cleaner and more readable way to handle asynchronous code compared to nested callbacks.

Async/Await: Async/await is a modern approach introduced in ES7 that allows you to write asynchronous code that looks synchronous. It is built on top of promises and provides a more elegant way to handle asynchronous operations.

Each of these methods has its own advantages and use cases, and understanding when to use each is important for efficient and maintainable code in Node.js applications.