Mastering Swift 4. J. Hoffman

 Dive into the latest release of the Swift programming language with this advanced development book for building highly performant applications. 
 About This Book:

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• Harness the latest and most advanced features of Swift 4 to develop quality iOS and macOS applications
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•  Comprehensive coverage of all the advanced features of Swift and guidance on advanced design techniques
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•  Dive deep into protocol extensions, learn new error handling model, and use featured Swift design patterns to write more efficient code
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•  Get to grips with advanced design techniques to write smarter, cleaner Swift code