![]() This protects you from difficult-to-diagnose lifetime bugs that only appear at runtime in optimized builds. Now, the most common programming patterns that depend on extended variable lifetimes are safe without requiring programmers to explicitly use withExtendedLifetime(). This involved updating existing optimizations and implementing several new optimizations. To enforce the rules, the compiler adopted a new internal representation that tracks the lexical scope of each variable. In Swift 5.7, ARC behavior is more predictable, user-friendly, and performant by specifying new rules to shorten the lifetime of variables when optimization is allowed. Automatic Reference Counting Improvements With certain configurations of protocols and associated types, type checking time would scale exponentially in Swift 5.6, but is now linear in Swift 5.7. The new generics implementation also improves performance. The new implementation fixes many long-standing bugs, mostly related to the handling of complex same-type requirements, such as same-type requirements on a collection’s SubSequence associated type, and code making use of the CaseIterable protocol which defines the requirement Self.Element = Self. In addition to the above language improvements for working with generics, the type checker’s generics implementation has been rewritten from scratch with improvements to correctness and performance. Developer Experience New Generics Implementation ![]() You can also find a complete list of language and standard library Swift Evolution proposals in the Swift Evolution Appendix. Most of these features were discussed at WWDC22 and were covered in a previous blog post, Swift language announcements from WWDC22. ![]() Brand new language support and APIs for string processing.Improved usability of a suite of existing pointer APIs.Actor isolation in distributed environments.Enhanced data race safety with new annotations and opt-in diagnositcs.Lifted long-standing language limitations to make generic programming more seamless.New shorthand syntax for common boilerplate code, including if let statements and multi-statement closure type annotations.The Swift 5.7 language and standard library feature a number of improvements: It is also available for free on the Apple Books store. The Swift community maintains a number of translations. If you’re new to Swift, The Swift Programming Language is the official Swift guide and has been updated for version 5.7. Thank you to everyone in the community for your Swift Forum discussions, bug reports, pull requests, educational content, and much more! Swift 5.7 is the culmination of countless contributions from members across the Swift community. Swift 5.7 is now officially released! Swift 5.7 includes major additions to the language and standard library, enhancements to the compiler for a better developer experience, improvements to tools in the Swift ecosystem including SourceKit-LSP and the Swift Package Manager, refined Windows support, and more. this has made Swift smaller, useful when Swift is statically linked (e.g.Holly Borla is an engineer on the Apple Swift team, and a member of the Swift Core Team, Language workgroup, and Diversity in Swift workgroup.dropped dependency on an external Unicode support library, replaced with a faster native implementation.support for Linux package formats: new native (experimental) toolchain installers for Amazon Linux 2 and CentOS 7.Year-round mentorships from now on /diversity has more details. We'll also introduce you to Swift Regex, better generics, and other tools built into the language to help you write more flexible & expressive code. We'll take you through performance improvements, explore more secure and extensible Swift packages, and share advancements in Swift concurrency. Description: Join us for an update on Swift.
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