411 REFERENCE · Wikibooks
Swift Introduction/Conclusion
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Conclusion
Open Issues
This book includes many of the most important concepts of Swift. It explains the basics like datatypes, control flow and collection types. It also deals with advanced topics like concurrency and unit testing. Of course there are a lot of other language features which are not described here, for instance inheritance, generics and protocols.
Consequences and Suggestions
To take advantage of all language features I recommend reading Apple's Language GuideApple Inc. | 2017 | Swift programming language | [online][accessed: 18.09.2017] | https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/index.html#//apple_ref/doc/uid/TP40014097-CH3-ID0 which describes all basic features as well as a lot of advanced topics. Moreover, I can suggest video blogs or video courses from Stanford University . There you can find a lot of free tutorials for iOS development.
References