how to use async await

To use async and await in Swift, you need to understand how they work to handle asynchronous operations. Here's a brief overview based on the content from WWDC:

1. Async Functions: In Swift, a function that can suspend its execution to wait for an asynchronous operation is marked with the async keyword. This indicates that the function can perform asynchronous tasks.

2. Await Keyword: When calling an async function, you use the await keyword to indicate that the function may suspend at that point. This allows other tasks to execute while waiting for the asynchronous operation to complete.

3. Concurrency in Swift: Swift's concurrency model allows you to write code that can perform multiple tasks simultaneously. This is particularly useful for operations like reading from disk or making network requests, where you don't want to block the main thread.

4. Actors: Swift introduces actors, which are reference types that protect their state by serializing access. Calls to actor methods from outside the actor's context are asynchronous, and you need to use await to access them.

For a practical example, you can refer to the session A Swift Tour: Explore Swift’s features and design (19:10) where the use of async and await is demonstrated in a server development environment.

Additionally, the session Explore Swift performance (24:33) discusses how async functions are implemented and how they manage memory allocation differently from synchronous functions.

These sessions provide a comprehensive look at how Swift handles asynchronous operations and concurrency, making it easier to write efficient and safe concurrent code.