Promises in JavaScript

• A Promise is an object representing the eventual completion or failure of an asynchronous operation.

States of a Promise:

1. Pending: The initial state, neither fulfilled nor rejected.
2. Fulfilled: The operation was completed successfully.
3. Rejected: The operation failed.

let promise = new Promise((resolve, reject) => {
  let success = true;
  if (success) {
    resolve('Operation successful');
  } else {
    reject('Operation failed');
  }
});

promise.then((message) => {
  console.log(message);
}).catch((error) => {
  console.error(error);
});