Available from Gumroad
Swift's solution to asynchronous and concurrent code is now part of the language itself. The new syntax is easier to read and follow the logical flow of what in the past was complicated, fragmented, or deeply nested. With async/await you'll focus on tasks instead of threads or even queues.
"The Curious Case of the Async Cafe" is a quirky fast-paced tour of the components of modern concurrency in Swift including async, await, Tasks, using continuations to replace and wrap delegates and closure-based APIs, AsyncSequences and AsyncStreams, structured concurrency using async let and Task Groups, and, of course, actors.
Updated for Xcode 14 and Swift 5.7 and tested on Apple Silicon.
Chapter 1: Async, Await, and Task
We Begin
Errors
The (too) Big Sleep
Introducing async / await
Task
Async and Errors
Testing
Be Careful
Chapter 2: Continuations
The Delegate Pattern
Delegate to Continuations
Multiple Continuations
Unsafe Continuations
Throwing Continuations
Closures and Callbacks
Async Alternatives
Async Wrappers
Refactorings
URLSession and Closures with Errors
Chapter 3: AsyncSequences and AsyncStreams
Notifications
Introducing AsyncStream
Sequences of Notifications
Sendable and Actor Boundaries
Transforming AsyncSequences
Sequence Pipelines
Combine
AsyncStream Continuations
Continuous Delivery
AsyncAlgorithms
Chapter 4: Structured Concurrency
Unstructured Async Calls
Async Let
Cancelling Tasks
Task Values
Unstructured App Store Search
TaskGroups
Sequences of TaskGroups
AsyncImage
Chapter 5: Actors
On and Off the Main Actor
Shared Mutable State
Actors
Suspending and Reentrancy
Nonisolated Members
Communication between Actors
Global Actors
TaskLocal
Creating Distributed Actors
Using Distributed Actors
Epilogue
Async Training from Dim Sum Thinking
