Promises in JavaScript
Promises are a way to handle asynchronous operations in JavaScript. They represent a value that will be available later – either successfully (resolved) or with an error (rejected).
Before Promises, callbacks were used (callback hell). Promises make async code cleaner and easier to read.
Promise States
- Pending – initial state
- Fulfilled – resolved successfully
- Rejected – failed with an error
Creating a Promise
Consuming Promises with .then/.catch
Chaining Promises
Promise.all, race, any, allSettled
.finally()
Quick Quiz
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