The update to Swift makes it the first since the language was open sourced on December 3. It also features contributions from non-Apple employees, but lacks support for Swift Core Libraries on Linux (which is coming in version 3).
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In addition to bug fixes and diagnostic enhancements, Swift 2.2 also features tuple comparison operators and Swift language version build configuration. If you want to track the evolution of Swift, there’s a GitHub repository just for you.
Xcode 7.3 brings in interactive playgrounds for all, and a “more intelligent” code completion. Developers can also support multiple Apple Watches for a single iPhone with Xcode 7.3, and the debugger automatically imports the proper framework for Swift and Objective C impressions. Of course, Xcode 7.3 also supports Swift 2.2.