The tutorial I'm using:
https://developer.apple.com/library/ios/referencelibrary/GettingStarted/DevelopiOSAppsSwift/index.html
Is an Swift playground. Apparently playgrounds are interpreted and have their own mark down language. You can actually write code in Swift, and see it execute as you go.
Not a bad idea. Apparently Apple means some people to use a playground to mock up and create projects….
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