appleDOTcom/swift
Swift is a new programming language for creating iOS and OS X apps. Swift builds on the best of C and Objective-C, without the constraints of C compatibility.
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loopinsightDOTcom
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If you are thinking of taking the plunge, go get the iBook. Even better, sign up as a developer, download Xcode and open the book as a playground from within Xcode. You’ll play as you learn. An incredibly fun experience.