Some neat references for Swift:

* <https://github.com/austinzheng/swift-2048>
* <http://www.learnswift.tips/>

----
Use the Swift REPL:

    $ sudo xcode-select -switch /Applications/Xcode6-Beta.app/Contents/Developer
    $ xcrun swift

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I find this snippet of Swift very clean. Looks like type pattern matching?

    enum ServerResponse {
        case Result(String, String)
        case Error(String)
    }
    
    let success = ServerResponse.Result("6:00 am", "8:09 pm")
    let failure = ServerResponse.Error("Out of cheese.")
    
    switch success {
    case let .Result(sunrise, sunset):
        let serverResponse = "Sunrise is at \(sunrise) and sunset is at \(sunset)."
    case let .Error(error):
        let serverResponse = "Failure...  \(error)"
    }

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The path `xcrun` resolves `swift` to:

    /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin