Code written with previous versions of Swift can be updated using the migration functionality built into Xcode. Swift 4.0, released in 2017, introduced several changes to some built-in classes and structures. In the first quarter of 2018 Swift surpassed Objective-C in measured popularity. Through version 3.0 the syntax of Swift went through significant evolution, with the core team making source stability a focus in later versions. Initially a proprietary language, version 2.2 was made open-source software under the Apache License 2.0 on December 3, 2015, for Apple's platforms and Linux. It underwent an upgrade to version 1.2 during 2014 and a major upgrade to Swift 2 at WWDC 2015. Swift was introduced at Apple's 2014 Worldwide Developers Conference (WWDC). Swift supports the concept of protocol extensibility, an extensibility system that can be applied to types, structs and classes, which Apple promotes as a real change in programming paradigms they term "protocol-oriented programming" (similar to traits and type classes). Swift was first released in June 2014, and the Swift toolchain has shipped in Xcode since version 6, released in 2014.Īpple intended Swift to support many core concepts associated with Objective-C, notably dynamic dispatch, widespread late binding, extensible programming and similar features, but in a "safer" way, making it easier to catch software bugs Swift has features addressing some common programming errors like null pointer dereferencing and provides syntactic sugar to help avoid the pyramid of doom. Swift compiles to machine code, as it is an LLVM-based compiler. Swift is a high-level general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. Objective-C, Rust, Haskell, Ruby, Python, C#, CLU, D
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