What happens when a promise is rejected in JavaScript?

What happens when a promise is rejected in JavaScript?

When a promise is rejected, it means that the asynchronous operation has failed. You can handle this using the .catch() method.

Can you give me an example of a rejected promise?

Sure! Here's a simple example:

let myPromise = new Promise((resolve, reject) => {
    let success = false;
    if (success) {
        resolve('Success!');
    } else {
        reject('Error: Promise was rejected.');
    }
});

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

What should I do when a promise is rejected?

You should handle the rejection using the .catch() method to prevent unhandled promise rejections and to manage errors gracefully.

Are there any best practices for handling promise rejections?

Yes! Always use .catch() to handle errors, consider using async/await for cleaner syntax, and log errors for debugging.