promises async await javascript full course

sure! in this tutorial, we'll cover javascript promises and the `async/await` syntax. these are essential concepts in modern javascript for handling asynchronous operations. we'll go through the following topics:

1. **what are promises?**
2. **creating and using promises**
3. **chaining promises**
4. **error handling with promises**
5. **introduction to `async/await`**
6. **using `async/await` with promises**
7. **error handling with `async/await`**
8. **best practices**

1. what are promises?

a promise is an object that represents the eventual completion (or failure) of an asynchronous operation and its resulting value. 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.

2. creating and using promises

you can create a promise using the `promise` constructor. here’s a basic example:

3. chaining promises

you can chain multiple `.then()` calls to handle a sequence of asynchronous operations:

4. error handling with promises

you can handle errors in a promise chain using `.catch()`. errors will propagate down the chain until they are caught:

5. introduction to `async/await`

`async/await` is syntactic sugar built on top of promises and allows you to write asynchronous code that looks synchronous. an `async` function always returns a promise.

6. using `async/await` with promises

to use `await`, you must be inside an `async` function. here’s an example:

7. error handling with `async/await`

you can handle errors in `async/await` using `try/catch`:

8. best practices

1. **always handle errors**: use `.catch()` for promises and `try/catch` for `async/await`.
2. **avoid nesting**: prefer chaining `.then()` calls rather than nesting them, as this makes your code clearer.

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