Advanced Swift

Advanced Swift

Advanced Swift Book Details

Title: Advanced Swift
Author: Chris Eidhof, Ole Begemann, Florian Kugler, and Ben Cohen
Language: English
Subject: Swift / Computers & Technology / Programming / Apple Programming
No. of pages: 431
Format: PDF, EPUB, MOBILE, Source code

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Introduction Advanced Swift Book

Advanced Swift is quite a bold title for a book, so perhaps we should start with what we mean by it.

When we began writing the first edition of this Advanced Swift book, Swift was barely a year old. We did so before the beta of 2.0 was released — albeit tentatively, because we suspected the language would continue to evolve as it entered its second year. Few languages — perhaps no other language — have been adopted so rapidly by so many developers.

But that left people with unanswered questions. How do you write “idiomatic” Swift? Is there a correct way to do certain things? The standard library provided some clues, but even that has changed over time, dropping some conventions and adopting others. Since its introduction nearly five years ago, Swift has evolved at a high pace, and it has become clearer what idiomatic Swift is.

To someone coming from another language, Swift can resemble everything they like about their language of choice. Low-level bit twiddling can look very similar to (and can be as performant as) C, but without many of the undefined behavior gotchas. The lightweight trailing closure syntax of map or 􏰀lter will be familiar to Rubyists. Swift generics are similar to C++ templates, but with type constraints to ensure generic functions are correct at the time of definition rather than at the time of use. The flexibility of higher-order functions and operator overloading means you can write code that’s similar in style to Haskell or F#. And the @objc and dynamic keywords allow you to use selectors and runtime dynamism in ways you would in Objective-C.

Given these resemblances, it’s tempting to adopt the idioms of other languages. Case in point: Objective-C example projects can be almost mechanically ported to Swift. The same is true for Java or C# design patterns and most functional programming patterns.

But then comes the frustration. Why can’t we use protocol extensions with associated types like interfaces in Java? Why are arrays not covariant in the way we expect? Why can’t we write “functor?” Sometimes the answer is because the part of Swift in question isn’t yet implemented. But more often, it’s either because there’s a different Swift-like way to do what you want to do, or because the Swift feature you thought was like the equivalent in some other language is, in reality, not quite what you think.

Swift is a complex language — most programming languages are. But it hides that complexity well. You can get up and running developing apps in Swift without needing to know about generics or overloading or the difference between static and dynamic dispatch. You can certainly use Swift without ever calling into a C library or writing your own collection type, but after a while, we think you’ll find it necessary to know about

these things — whether to improve your code’s performance, or to make it more elegant or expressive, or just to get certain things done.

Learning more about these features is what this Advanced Swift book is about. We intend to answer many of the “How do I do this?” or “Why does Swift behave like that?” questions we’ve seen come up again and again on various forums. Hopefully, once you’ve read our book, you’ll have gone from being aware of the basics of the language to knowing about many advanced features and having a much better understanding of how Swift works. Being familiar with the material presented is probably necessary, if not sufficient, for calling yourself an advanced Swift programmer.

Who Is This Advanced Swift Book For?

This book targets experienced (though not necessarily expert) programmers, such as existing Apple-platform developers. It’s also for those coming from other languages such as Java or C++ who want to bring their knowledge of Swift to the same level as that of their “go-to” language. Additionally, it’s suitable for new programmers who started on Swift, have grown familiar with the basics, and are looking to take things to the next level.

The Advanced Swift book isn’t meant to be an introduction to Swift; it assumes you’re familiar with the syntax and structure of the language. If you want some good, compact coverage of the basics of Swift, the best source is the official Apple Swift book (available on iBooks or on Apple’s website). If you’re already a confident programmer, you could try reading our book and the Apple Swift book in parallel.

This is also not a Advanced Swift book about programming for macOS or iOS devices. Of course, since Swift is used a lot for development on Apple platforms, we’ve tried to include examples of practical use, but we hope this book will be useful for non-Apple-platform programmers as well. The vast majority of the examples in the book should run unchanged on other operating systems. The ones that don’t are either fundamentally tied to Apple’s platforms (because they use iOS frameworks or rely on the Objective-C runtime) or only require minimal changes. We can say from personal experience that Swift is a great language for writing server apps running on Linux, and the ecosystem and community have evolved over the past few years to make this a viable option.