What are the new features of Swift in 2024?

The new features of Swift in 2024, as presented at WWDC, include several significant updates and improvements:

1. Swift 6 Language Mode:

   • Data Race Safety: Swift 6 introduces a new language mode that provides data race safety guarantees, helping developers write correct concurrent programs. This is a major step in ensuring the safety and reliability of Swift code in concurrent environments.
   • Non-Copyable Types: Swift 6 introduces non-copyable types, which means that all Swift types, whether value types or reference types, are copyable by default, but now you can define types that cannot be copied, enhancing memory management and performance.

2. Embedded Swift:

   • A new language subset called Embedded Swift is introduced, which can run on highly constrained systems, making Swift a viable option for embedded systems and IoT devices.

3. Concurrency Improvements:

   • Significant improvements to data race checking and complete concurrency checking in Swift 5.10, ensuring safety when passing non-sendable values across active isolation boundaries.

4. Swift Testing:

   • An all-new testing framework named Swift Testing has been introduced. It features expressive APIs that simplify writing tests, making it easier to ensure code quality and reliability.

5. C++ Interoperability:

   • Enhanced interoperability with C++, allowing for more seamless integration and usage of C++ code within Swift projects.

6. Typed Throws:

   • Introduction of typed throws, which allows functions to specify the types of errors they can throw, improving error handling and code clarity.

7. Low-Level Synchronization Primitives:

   • New low-level synchronization primitives have been added to the language, providing more tools for developers to manage concurrency and synchronization in their applications.

For more detailed information, you can refer to the session "What’s new in Swift" starting at 17:03.