what is new in Xcode 15

Xcode 16 introduces several new features and improvements to enhance the development experience. Here are some of the key updates:

1. Code Completion:

   • Xcode 16 features a new code completion engine powered by an on-device coding model specifically trained for Swift and Apple SDKs. This engine uses surrounding code context to provide more thorough suggestions, improving the speed and accuracy of coding (What’s new in Xcode 16).

2. Swift 6:

   • Swift 6 introduces a new language mode that provides concurrency safety guarantees, turning data races into compile-time issues, which enhances code correctness and safety (What’s new in Xcode 16).

3. Previews:

   • Xcode Previews now use a new dynamic linking architecture that employs the same build artifacts for previews and when you build and run, making the workflow smoother and more productive (Platforms State of the Union).

4. Build Improvements:

   • Explicit modules are introduced to improve parallelism, diagnostics, and debugging without changing any code. For C and Objective-C, explicit modules are enabled by default, while for Swift, they need to be opted in (What’s new in Xcode 16).

5. Swiftassist:

   • Swiftassist is a new feature that acts as a coding companion, capable of answering coding questions and helping with tasks like experimenting with new APIs. It leverages a larger and more powerful model that runs in the cloud (Platforms State of the Union).

6. Debugging and Performance:

   • Xcode 16 introduces a single view of backtraces showing relevant code from all stack frames together, a flame graph for profiling data in Instruments, and enhancements to localization catalogs (Platforms State of the Union).

7. Instruments:

   • The new flame graph feature in Instruments provides a visual way of seeing call stacks, helping developers find performance issues more effectively (What’s new in Xcode 16).

These updates are designed to make developers more productive and improve the quality of their apps. For more detailed information, you can check out the What’s new in Xcode 16 session.