what's new on swift 6

Swift 6 introduces several significant improvements and new features aimed at enhancing portability, performance, and the overall developer experience. Here are some of the key updates:

1. Data Race Safety: Swift 6 introduces a new language mode that provides data race safety guarantees, helping developers write correct concurrent programs. This mode is opt-in and can be adopted module by module, allowing for incremental migration (Platforms State of the Union).

2. Non-Copyable Types: Swift 6 introduces non-copyable types, which are types that cannot be copied, providing more control over memory management and performance (What’s new in Swift).

3. Embedded Swift: A new language subset called Embedded Swift is introduced, which can run on highly constrained systems like operating system kernels and microcontrollers (Platforms State of the Union).

4. Concurrency Improvements: There are significant improvements to concurrency, including better data race checking and the ability to pass non-sendable values across active isolation boundaries safely (What’s new in Swift).

5. Swift Testing Framework: An all-new testing framework named Swift Testing is introduced, which has expressive APIs that make it simple to write tests (Platforms State of the Union).

6. GitHub Organization: Swift is moving to a new organization on GitHub (swiftlang), which will host the Swift Compiler foundation and other key libraries (Platforms State of the Union).

For a detailed overview of these updates, you can watch the session What’s new in Swift.