Promises
A Promise is an object representing the eventual completion or failure of an asynchronous operation.
A promise can be in one of three states:
- pending: The initial state; neither fulfilled nor rejected.
- fulfilled: The operation completed successfully.
- rejected: The operation failed.
const myPromise = new Promise((resolve, reject) => {
// Asynchronous operation here
setTimeout(() => {
const success = true;
if (success) {
resolve('The operation was successful!');
} else {
reject('The operation failed.');
}
}, 1000);
});
myPromise
.then(result => {
console.log(result); // "The operation was successful!"
})
.catch(error => {
console.error(error); // "The operation failed."
});