macro
Asked on 2025-07-02
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It seems like you're interested in the use of macros in Swift, as discussed in various sessions at WWDC. Here are some highlights:
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Expect and Require Macros: In the session "Meet Swift Testing," the expect macro is highlighted for its flexibility in testing. It allows you to pass any expression, including operators and method calls, and provides detailed results if it fails. The require macro is used to end a test early if an expectation fails, throwing an error if the expression is false. This is particularly useful for safely unwrapping optional values. You can learn more about these macros in the Meet Swift Testing session.
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Index Macro in SwiftData: The session "What’s new in SwiftData" introduces the index macro, which can be used to enhance the performance of your app by adding unique constraints to your schema. This helps in avoiding duplicate models and speeding up queries. More details can be found in the What’s new in SwiftData session.
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Playground Macro in Xcode: In the session "What’s new in Xcode," a new macro called Playground is introduced. It allows for quick iteration on any code, similar to previews, by adding a playground inline in your document. This feature is demonstrated in the What’s new in Xcode session.
These sessions provide a comprehensive overview of how macros can be utilized to enhance testing, data management, and code iteration in Swift.

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 Xcode
Discover the latest productivity and performance advancements in Xcode 26. Learn how to leverage large language models in your development workflow. Explore editing and debugging enhancements, improved performance and testing tools, and Swift Build - the open-source build system engine used by Xcode.

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”.