swift macros
Generated on 8/15/2024
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Swift macros are a powerful feature introduced to enhance the expressivity and reduce boilerplate in Swift code. They act as compiler plugins, taking the syntax tree as input and returning transformed code as output. This allows developers to create more expressive APIs and streamline their code.
For example, in the session titled "What’s new in Xcode 16," the previewable macro is introduced, which can be attached to property wrappers like state, allowing developers to use them directly within a preview block. This simplifies the process of creating UI previews by reducing the need for wrapper views.
In the session "Meet Swift Testing," the expect macro is highlighted as a flexible tool for testing. It allows developers to pass any expression, including operators and method calls, and provides detailed results if a test fails. The require macro is also mentioned, which can end a test early if an expectation fails, ensuring that tests do not proceed with invalid assumptions.
Additionally, the session "What’s new in SwiftData" discusses the index macro, which improves the performance of queries by optimizing how data is stored and retrieved.
For more detailed information on Swift macros, you can refer to the session "A Swift Tour: Explore Swift’s features and design," where macros are discussed as a flexible tool for developers. If you are interested in learning more about specific macros like the previewable macro, you can check the session "What’s new in Xcode 16" at the chapter on "Improvements to Previews."
Here are some relevant sessions that discuss Swift macros:
Explore Swift performance
Discover how Swift balances abstraction and performance. Learn what elements of performance to consider and how the Swift optimizer affects them. Explore the different features of Swift and how they’re implemented to further understand the tradeoffs available that can impact performance.
What’s new in Xcode 16
Discover the latest productivity and performance improvements in Xcode 16. Learn about enhancements to code completion, diagnostics, and Xcode Previews. Find out more about updates in builds and explore improvements in debugging and Instruments.
Platforms State of the Union
Discover the newest advancements on Apple platforms.
A Swift Tour: Explore Swift’s features and design
Learn the essential features and design philosophy of the Swift programming language. We’ll explore how to model data, handle errors, use protocols, write concurrent code, and more while building up a Swift package that has a library, an HTTP server, and a command line client. Whether you’re just beginning your Swift journey or have been with us from the start, this talk will help you get the most out of the language.
What’s new in SwiftData
SwiftData makes it easy to add persistence to your app with its expressive, declarative API. Learn about refinements to SwiftData, including compound uniqueness constraints, faster queries with #Index, queries in Xcode previews, and rich predicate expressions. Join us to explore how you can use all of these features to express richer models and improve performance in your app. To discover how to build a custom data store or use the history API in SwiftData, watch “Create a custom data store with SwiftData” and “Track model changes with SwiftData history”.
Meet Swift Testing
Introducing Swift Testing: a new package for testing your code using Swift. Explore the building blocks of its powerful new API, discover how it can be applied in common testing workflows, and learn how it relates to XCTest and open source Swift.
What’s new in Swift
Join us for an update on Swift. We’ll briefly go through a history of Swift over the past decade, and show you how the community has grown through workgroups, expanded the package ecosystem, and increased platform support. We’ll introduce you to a new language mode that achieves data-race safety by default, and a language subset that lets you run Swift on highly constrained systems. We’ll also explore some language updates including noncopyable types, typed throws, and improved C++ interoperability.