How do I create a promise in JavaScript?

How do I create a promise in JavaScript?

To create a promise in JavaScript, you can use the Promise constructor. Here's a basic example:

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

This creates a promise that can either be resolved or rejected.

What do resolve and reject do?

resolve is a function that you call when the asynchronous operation completes successfully, while reject is called when it fails. This allows you to handle the outcome of the promise.

How can I use the promise once it's created?

You can use the .then() method to handle a resolved promise and .catch() to handle a rejected one. For example:

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