Concurrency Demystified

In this first lesson, you’ll delve into mastering the fundamental principles of async/await, a powerful paradigm in modern asynchronous programming. You’ll learn to identify and mark asynchronous functions using the async keyword, understanding when and where to apply it to signal asynchronous execution. Additionally, you’ll explore the transformative power of the await keyword, mastering its ability to pause execution until asynchronous operations are complete.

In this lesson, you’ll learn how to implement network calls using URLSession‘s new async/await APIs. You’ll focus on parsing network responses at the end of the session and also on how to handle updates during the session to add visual feedback to the user. Finally, you’ll ensure the downloaded data are presented correctly in the UI, providing a seamless and glitch-free user experience.

In this lesson, you’ll learn to execute background tasks using the SwiftUI Task instructions and how to assign the proper priority to the task. You’ll explore techniques for safely updating the user interface with background task results and maintaining a seamless and responsive user experience.

Beginner-friendly guide to Swift actors: how exclusive, serialized access prevents data races, why await crosses isolation, and how to design for reentrancy. You’ll use @MainActor and a custom global actor to keep UI and disk I/O safe. Includes a runnable image-cache app (Observation + environment injection) and a Playground smoke test.