Asynchronous programming and error handling

This chapter delves into advanced techniques for managing asynchronous operations in Swift, a crucial aspect for building responsive and efficient applications. You'll explore how to effectively bridge traditional completion handlers with modern async/await syntax and execute main-actor-isolated functions within DispatchQueue.main.async for UI safety. We'll also discuss how to use yield() to allow other tasks to proceed during lengthy operations and implement task cancellation mechanisms to stop unnecessary work, optimizing resource usage.

Additionally, you'll learn how to manage the execution of concurrent tasks with priorities and delay tasks using modern clock APIs. Handling and refining error management in asynchronous code is also covered, including strategies for rethrowing errors with added context and defining the scope of try explicitly. Finally, we'll look at transforming and converting the results of asynchronous operations, enhancing error handling and the usability of the Result type.

These advanced strategies will provide you with the tools to write cleaner, more robust asynchronous code, improving the performance and reliability of your Swift applications.