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  • Book Overview & Buying Swift High Performance
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Swift High Performance

Swift High Performance

By : Koval
4 (8)
Buy this Book
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Swift High Performance

Swift High Performance

4 (8)
By: Koval
Buy this Book

Overview of this book

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.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Exploring Swift's Power and Performance
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1. Exploring Swift's Power and Performance
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Swift speed
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Welcome to Swift
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Swift's features and benefits
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Swift interoperability
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Performance – meaning and key metrics
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Summary
2
2. Making a Good Application Architecture in Swift
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2. Making a Good Application Architecture in Swift
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Making a Swift application
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The differences between variables and constants
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Immutability
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Value types and immutability
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Representing the absence of values with optionals
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Functional programming
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Generics
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Safety
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Summary
3
3. Testing and Identifying Slow Code with the Swift Toolkit
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3. Testing and Identifying Slow Code with the Swift Toolkit
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REPL
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Playgrounds
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LLDB
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REPL in Xcode
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Console logs
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Performance measuring in unit tests
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Instruments
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A reminder
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Summary
4
4. Improving Code Performance
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4. Improving Code Performance
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Understanding performance optimization
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Optimization checklist
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Swift code compilation
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Constants and variables
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Method calls
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Intelligent code
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Improving speed
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Value objects and reference objects
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Swift arrays and unsafe C arrays
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Avoiding Objective-C
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Summary
5
5. Choosing the Correct Data Structure
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5. Choosing the Correct Data Structure
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An overview of data structures
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Collection types
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Swift standard library collections
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Collection memory allocation
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The CollectionType protocol methods
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Accelerate and Surge
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Other collections
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Summary
6
6. Architecting Applications for High Performance
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6. Architecting Applications for High Performance
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Achieving high performance
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Concurrency overview
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Designing asynchronous code
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Avoiding state
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Divide and conquer
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Controlling the lifetime
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Summary
7
7. The Importance of Being Lazy
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7. The Importance of Being Lazy
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The lazy mindset
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Lazy loading
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Lazy collections and evaluation
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Summary
8
8. Discovering All the Underlying Swift Power
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8. Discovering All the Underlying Swift Power
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How Swift is so fast
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Swift command line tools
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The Swift compiler
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The Swift compilation process and swiftc
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Analyzing executable files
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Summary
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Final thoughts
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Index
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Index

Lazy loading

The lazy loading pattern allows you to delay the creation of an object until you try to use it. This pattern can be implemented in any programming language. In Objective-C, we have used the property's getters and checked whether it was initialized. Swift adds support for lazy loading into the language, and this makes it even easier to apply this pattern. There are many things that can be lazy loaded, and we will cover them in this chapter.

Global constants and variables

Global variables and constants are always loaded lazily in Swift. This means that every global variable is initialized only when you access it for the first time. As a test, let's create a new Person.swift file and add this code to it:

struct Person {
  let name: String
  let age: Int
  
  init(name: String, age: Int) {
    self.name = name
    self.age = age
    print("\(name) Created")
  }
}

let Jon = Person(name: "Jon", age: 20)
let Sam = Person(name: "Sam", age: 28)

This file contains two global constants: Jon...

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Swift High Performance
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