What are JavaScript promises and how do they work?

What are JavaScript promises and how do they work?

JavaScript promises are objects that represent the eventual completion or failure of an asynchronous operation. They allow you to handle asynchronous code more effectively.

Can you give me an example of how to create a promise?

Sure! You can create a promise using the Promise constructor. Here's a simple example:

const myPromise = new Promise((resolve, reject) => {
    const success = true; // Simulate success or failure
    if (success) {
        resolve('Operation was successful!');
    } else {
        reject('Operation failed!');
    }
});

How do I handle the result of a promise?

You can handle the result of a promise using the .then() method for success and .catch() for errors. For example:

myPromise
    .then(result => console.log(result))
    .catch(error => console.error(error));

What is the difference between a promise and a callback?

Promises provide a cleaner and more manageable way to handle asynchronous operations compared to callbacks, which can lead to callback hell. Promises allow chaining and better error handling.