Book Image

Hands-On Design Patterns with Swift

By : Florent Vilmart, Giordano Scalzo, Sergio De Simone
Book Image

Hands-On Design Patterns with Swift

By: Florent Vilmart, Giordano Scalzo, Sergio De Simone

Overview of this book

Swift keeps gaining traction not only amongst Apple developers but also as a server-side language. This book demonstrates how to apply design patterns and best practices in real-life situations, whether that's for new or already existing projects. You’ll begin with a quick refresher on Swift, the compiler, the standard library, and the foundation, followed by the Cocoa design patterns – the ones at the core of many cocoa libraries – to follow up with the creational, structural, and behavioral patterns as defined by the GoF. You'll get acquainted with application architecture, as well as the most popular architectural design patterns, such as MVC and MVVM, and learn to use them in the context of Swift. In addition, you’ll walk through dependency injection and functional reactive programming. Special emphasis will be given to techniques to handle concurrency, including callbacks, futures and promises, and reactive programming. These techniques will help you adopt a test-driven approach to your workflow in order to use Swift Package Manager and integrate the framework into the original code base, along with Unit and UI testing. By the end of the book, you'll be able to build applications that are scalable, faster, and easier to maintain.
Table of Contents (22 chapters)
Title Page
Copyright and Credits
About Packt
Contributors
Preface
Index

Swift basic types


Swift comes with a number of basic types that are at the root of all of your programs. All of your programs leverage these basic types, one way or another. Let's take some time to revisit these types and their main features, along with some hidden gems.

We can organize all of the Swift's basic types into the following categories:

  • Logical types: Bool
  • Numeric types: Int, Double, and Float, among others
  • Range types: Range and ClosedRange
  • Errors: Error protocol
  • Optionals: Optional enum

I don't believe it's necessary to introduce the Bool, Int, Double, and Float types, as they are all very common in all languages. Perhaps their most interesting feature is that they are defined as structs, and not primitive types, like in Java.

Working with ranges

Ranges come in two flavors: Range and ClosedRange. The difference between Range and ClosedRange is the inclusion of the upper bound. In a ClosedRange, the upper bound is included; in Range, it isn't.

If you want to include all numbers between...