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Kevin Myers7,604 Points
Should I not have updated Xcode 7.0 ? Some of the tutorials seem to behave different since updating.
println appears to be an error now I have to type print instead. That's just one example. Is there a way to download previous version?
Martin WildfeuerCourses Plus Student 11,071 Points
Xcode 7 comes with Swift 2, a lot of (awesome) changes have been made there. In my opinion, you not only should, but have to update if you want to learn Swift. Swift is a quite young language, and things will change while it evolves.
As you said, most of the material available here refers to Swift 1.2, as Swift 2 has only been released to the public a week or two ago. Have a look at the teachers notes, they should tell you what has been changed.
Moreover, there's a Treehouse workshop video, What's new in Swift 2.0
Always a good read: Ray Wenderlich, What's new in Swift 2