What are promises in Node.js and how do I use them?

What are promises in Node.js and how do I use them?

Promises in Node.js are objects that represent the eventual completion or failure of an asynchronous operation. They allow you to write cleaner, more manageable code by avoiding callback hell.

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

Sure! 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.');
    }
});

This creates a promise that resolves if the operation is successful.

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 if I want to run multiple promises at the same time?

You can use Promise.all() to run multiple promises concurrently. It takes an array of promises and resolves when all of them have resolved, or rejects if any promise fails.