![]() It’s now easier to develop multiple packages in tandem before tagging your first official release, or to work on a branch of multiple packages together.Swift 4 introduces new workflow features and a more complete API for the Swift Package Manager: One advantage of these language modes is that you can start using the new Swift 4 compiler and migrate fully to Swift 4 at your own pace, taking advantage of new Swift 4 features, one module at a time.įor more information about Swift 4 migration and compatibility modes, see Migrating to Swift 4 Package Manager Updates The language mode is specified to the compiler by the -swift-version flag, which is automatically handled by the Swift Package Manager and Xcode. Some source migration will be needed for many projects, although the number of source changes are quite modest compared to many previous major changes between Swift releases. Swift 4.0: This mode includes all Swift 4.0 language and API changes. Most new language features in Swift 4 are available in this language mode. Updates to previously existing APIs (either those that are part of the standard library or APIs shipped by Apple) will not appear in this mode, in order to provide this level of source compatibility. Swift 3.2: In this mode, the compiler will accept the majority of sources that built with the Swift 3.x compilers. The compiler supports two language modes: With Swift 4, you may not need to modify your code to use the new version of the compiler. SE-0176 Enforce Exclusive Access to Memory.SE-0170 NSNumber bridging and Numeric types.SE-0169 Improve Interaction Between private Declarations and Extensions.SE-0164 Remove final support in protocol extensions.SE-0142 Permit where clauses to constrain associated types.Swift 4 also implements the following language proposals from the Swift Evolution process: See more at: SE-0166 Swift Archival & Serialization Additional language updates ![]() Swift 4 supports archival of struct and enum types and enables type-safe serialization to external formats such as JSON and plist. SE-0173 Add MutableCollection.swapAt(_:_:).SE-0154 Provide Custom Collections for Dictionary Keys and Values.Swift 4 adds improvements for creating, using and managing Collection types. SE-0183 Substring performance affordances.SE-0178 Add unicodeScalars property to Character.SE-0163 String Revision: Collection Conformance, C Interop, Transcoding.Swift 4 includes a faster, easier to use String implementation that retains Unicode correctness and adds support for creating, using and managing substrings. Swift 4.0 is a major language release and contains the following language changes and updates that went through the Swift Evolution process: String You can watch a quick overview of it by watching the WWDC 2017: What’s New in Swift presentation, and try out some of the new features in this playground put together by Ole Begemann. Swift 4 is now officially released! Swift 4 builds on the strengths of Swift 3, delivering greater robustness and stability, providing source code compatibility with Swift 3, making improvements to the standard library, and adding features like archival and serialization. Ted Kremenek is a member of the Swift Core Team and manages the Languages and Runtimes group at Apple.
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