Swift High Performance, by Kostiantyn Koval
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Swift High Performance, by Kostiantyn Koval
Best Ebook PDF Online Swift High Performance, by Kostiantyn Koval
Leverage Swift and enhance your code to take your applications to the next level
About This Book
- Build solid, high performance applications in Swift
- Increase your efficiency by getting to grips with concurrency and parallel programming
- Use Swift to design performance-oriented solutions
Who This Book Is For
This book is aimed at experienced Swift developers wanting to optimize their programs on Apple platforms to optimize application performance.
What You Will Learn
- Build solid, stable, and reliable applications using Swift
- Use REPL and Pl to manage and configure relational databases
- Explore Swift's features including its static type system, value objects, and functional programming Design reusable code for high performance in Swift
- Use to Xcode LLBD and REPL to debug commands
- Avoid sharing resources by using concurrency and parallel programming
- Understand the lazy loading pattern, lazy sequences, and lazy evolution.
In Detail
Swift is one of the most popular and powerful programming languages for building iOS and Mac OS applications, and continues to evolve with new features and capabilities. Swift is considered a replacement to Objective-C and has performance advantages over Objective-C and Python. Swift adopts safe programming patterns and adds modern features to make programming easier, more flexible, and more fun.
Develop Swift and discover best practices that allow you to build solid applications and optimize their performance.
First, a few of performance characteristics of Swift will be explained. You will implement new tools available in Swift, including Playgrounds and REPL. These will improve your code efficiency, enable you to analyse Swift code, and enhance performance. Next, the importance of building solid applications using multithreading concurrency and multi-core device architecture is covered, before moving on to best practices and techniques that you should utilize when building high performance applications, such as concurrency and lazy-loading. Finally, you will explore the underlying structure of Swift further, and learn how to disassemble and compile Swift code.
Style and approach
This is a comprehensive guide to enhancing Swift programming techniques and methodology to enable faster application development.
Swift High Performance, by Kostiantyn Koval- Amazon Sales Rank: #1312838 in Books
- Published on: 2015-11-13
- Released on: 2015-11-06
- Original language: English
- Number of items: 1
- Dimensions: 9.25" h x .48" w x 7.50" l, .82 pounds
- Binding: Paperback
- 159 pages
About the Author
Kostiantyn Koval
Kostiantyn Koval is a passionate developer with 5 years of experience. All the time, his main passion and work has been building iOS applications. So far, he has built many different applications, including games, enterprise apps, and big platforms. He fell in love with Swift the first minute he saw it, and keeps expressing this to the rest of the world. Other than iOS, he is also interested in technologies and languages such as Scala, Clojure, LLVM, Ruby, JavaScript, and others. He loves open source and blogging. You can find him on GitHub at https://github.com/kostiakoval and his blogs at https://medium.com/@kostiakoval. Other places to contact him are http://kostiakoval.github.io and Twitter at @KostiaKoval. His hobbies are programming, building start-ups, and making this world better with software.
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Most helpful customer reviews
5 of 5 people found the following review helpful. Very good, if flawed, book with excellent tips By Scott Steinman The intent of the book is to provide its readers with ways to make their code more “Swift-like” (for example, more functional in its style) and more efficient. There are almost no books that do so at this point in Swift’s development. In fact, most Swift books are at the introductory level. “Functional Programming in Swift” by Chris Eidhof, Florian Kugler and Wouter Swierstra covers more advanced features, but it is written with a background in mathematics in mind, as are many books on functional programming. Likewise, “Advanced Swift” by Chris Eidhof and Airspeed Velocity, as its name implies, is at a more advanced level. Each of these books is valuable, but SwiftHigh Performance fills a gap by attempting to cover advanced features while remaining more approachable for the beginning to intermediate programmer.One flaw in the book is that in the first two chapters on Swift’s power and how to create a proper Swift app architecture, a lot of material is covered in very terse manner, with no discussion of how they impact performance — which is the purpose of the book. Worse yet, Swift’s features are simply listed and concepts mentioned without explanation in most cases. A prime example of this is the coverage of Swift’s functional language and standard library features in Chapter 2. All of this can be learned more easily and in more detail in Apple’s Swift book. In my opinion, this makes these first two chapters completely disposable. It is not until Chapter 3 (after one third of the book) thatperformance issues in Swift are first covered.Some of the source code exhibits minor glitches with the latest version of Swift on Xcode 7.2 that are not fixed by automatic conversion to the latest Swift syntax. These are inconveniences rather than show-stopping bugs. For example, the Set.swift file in the Data Structures project calls advance(), not advanceBy(). More puzzling is that numerous empty print() calls are left throughout the code. Why use print if no message is to be displayed?There are several grammatical, syntax and spelling mistakes that bypassed the editors. I won’t mention them all, but three can be found almost immediately: (1) In the sample program demonstrating tuples in Chapter 1, a string of “not fount” is used twice. (2) Computer scientist Donald Knuth’s name is misspelled. (3) An “@IBOutles” is mentioned in Chapter 2. These errors could have been easily corrected by an editor or reviews prior to publication, but I’ve also noted the same problem of a large number of spelling and grammatical errors — including very awkward sentence syntax that made reading difficult — in another recent Packt book. The publisher needs to devote more time and effort in polishing the released books.Despite these shortcomings, I still recommend buying this book. It is in Chapters 3-7 where this book truly shines, starting with a discussion of running the REPL within Xcode, which I would not have thought of on my own. It covers ways of improving the performance of swift code, with some sample code’s generated assembly code and performance displayed. A lot of valuable information is contained in these chapters that makes reading “Swift High Performance” worthwhile.Specific Comments:Chapter 1- Exploring Swift’s Power and Performance-Chapter 1 is simply an overview of the features of Swift. Most of these features are given only a cursory mention. This chapter is therefore not really necessary, as readers of the book would be people who are already programming in Swift and want to improve the quality of their code. This chapter could have been almost entirely omitted, with perhaps a few points merged into the following chapters.In the Clean Code Summary, the sample program should be finding people in the array of Persons who below the age of 18, then lower-case their names. In fact, the program finds people below the age of 18, then lower-cases the names of everybody in the original array, not just those below age 18. This is true of both the Swift and Objective- C versions of the code.Terms are presented without defining them. For example, in the discussion on functional programming, the term “first class function” is mentioned but not described. In the Generic Purpose section, the function minimum is made generic, but reason for the need to make the generic conform to the Comparable protocol is not mentioned.The section on Objective-C interoperability should have expanded slightly on its coverage of upcasting and downcasting, and why there are differences between them. Specifically, it is first stated that casting is usually an unsafe operation, yet the sample code suggests that is it only downcasting that is unsafe. In addition, which Objective-C types have toll-free bridging that removes the need to typecast?The coverage of optionals as a way to avoid the Pyramid of Doom problem should be combined with the coverage of optionals in Chapter 2.Chapter 2- Making a Good Application Architecture in Swift-In the beginning of the section on functional programming, it’s stated that a function should only operate with arguments passed to it. Perhaps this should be rephrased to state that it should operate only on arguments passed to it and not class properties or global variables.It’s stated that functional programming describes what you want to do and not how you want to do it, but this statement is not explained. I realize that this is not a book on functional programming, but if a concept is mentioned, it should also be explained. This is a general problem throughout this chapter.Chapter 3- Testing and Identifying Slow Code with the Swift Toolkit-The coverage of REPL is only two pages. While this is probably adequate for Apple programmers, who will more likely use the playground instead, a future edition of the book might need to cover it in more depth because the open-source version of Swift for Linux does not include playgrounds. A good resource for using playgrounds is Erica Sadun’s book “Playground Secrets and Power Tips”. Likewise, a complete reference on creating interactive documentation for playgrounds is Erica Sadun’s “Swift Documentation Markup: an Illustrated Tour”.In the discussion of the LLDB debugger, it’s stated that “because we made an iOS app”, a breakpoint will be made in the didFinishLaunchingWithOptions method. I could not find where this iOS app is discussed.The coverage of running the REPL within Xcode, and doing performance logging with console logs is very good.One section that I fould a bit puzzling is the section comparing the performance of variables (declared with var) versus constants (declared with let), It looks like the code using variables and the code using constants perform the same! Average time for constants = 12.681316, and for variables = 12.681316. I assume this was a cut-and-paste error by the author.Chapter 4- Improving Code Performance-The section on functions and methods is very useful. It directly compares the speed of function calls at different scopes in the program, such as calling global functions, static methods, final methods and instance methods.The section on removing print logs has some excellent tips, as does the coverage of using the final keyword for functions.The direct comparison of generated assembly code for value objects (structs in this case) and reference objects (classes) clearly demonstrates the ability of Clang to optimize code for value objects.Chapter 5- Choosing the Correct Data Structure-The Collection Memory Allocation section starts by mentioning performance optimization of collections “when you instance and instance of it”. That should probably say “instantiate” instead.Chapter 6- Architecting Applications for High Performance-This chapter discusses concurrency by initially stating the duties of the main thread. It might help some readers if thread was defined and discussed first.The Threads section shows sample code calling the NSThread.detachNewThreadSelector method, but the method is not really discussedaside from stating that it can create a new thread. What are the advantages or disadvantages of using it versus using another way to create a new thread?In the first paragraph of Designing Asynchronous Code, it’s stated that the technique just taught will “get more function style Input -> Output functions style”. I assume the author means that the code’s style adheres to a functional programming style better.Chapter 7- The Importance of Being Lazy-Very nice coverage of lazy loading and lazy sequences and collections.Chapter 8- Discovering All the Underlying Swift Power-This chapter mentions many tools, but really offers little insight into how to use them to analyze core or to find performance bottlenecks or improper memory usage.In the coverage of the Hopper Disassembler, it’s stated that we’ll compare optimized and unoptimized code, but I could not find the results of the compilation. Where is the code compared? This appears to be missing.
0 of 0 people found the following review helpful. Surprisingly engaging, illuminating and endearing By Michael I was initially concerned that my limited production Swift experience (so far) would hinder the usefulness of this book but the gentle, unassuming nature of the writing soon made that concern dissipate. Instead I got a behind the scenes look at what Swift is, what it does well, and why - from the basics up. In knowing these things, you are then prepared for the second half of the book which helps you to think at the architectural level about programming in Swift.The style is a little informal, and it seems that maybe English is a second language for the author, which may be an issue for some readers. I found it to be endearing and allowed the obvious love that the writer has for Swift, and for programming in general, to come though. It felt more like he was talking to me, instead of lecturing or essaying.Given I have page after page of highlights to go back and review, refer to and turn into a crib sheet, I think it's a worthwhile read for everyone wishing to take their Swift developer skills to the next level. Perhaps not essential, but certainly highly beneficial.
0 of 0 people found the following review helpful. A must if you want to start getting more out of swift performance By Andrea If you like going deeper into a language and missed the kind of insights into optimization you can get for other language, this is the book for you.Swift is getting more and more mature and a guide like this is what was actually missing as you often end up asking yourself if what you're doing is the most efficient thing.Probably not a good fit for a complete beginner, but you don't need to be a guru either to appreciate it.
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