Swift 4 overhauled its number system to adopt a protocol-oriented design. Not only does that simplify the way you work with integer and floating-point numbers, but it allows anyone to define their own numeric types that look and feel like they’re built-in.
This guide offers a comprehensive look at what's new, and how to take advantage of these changes in your own apps.
The first chapter takes a deep dive into how numbers work on computers in general and in Swift specifically. After reading it, you’ll be able to represent integers in binary, decimal, and hexadecimal, explain how signed integers store positive and negative numbers using two’s complement, convert bit patterns into decimal floating-point numbers, and much more.
From there, the book looks at different ways you can use numbers, such as:
- Working with money, using the Decimal type and creating a Currency type
- Performing dimensional analysis and physical calculations using the Foundation units & measurements API and Playground live views
- Formatting numbers in a locale-appropriate way for a global audience
Each chapter starts with a delightful illustration from Lauren Mendez (@littleloboart). There are also plenty of sample code projects provided as Playground files.
About Flight School
Flight School is a new book series for Swift developers. Each month, we'll explore an essential part of iOS, macOS, and Swift development through concise, focused books.
Our guides offer practical knowledge that will help you be more productive and effective as a developer. We strive to create resources that are engaging, informative, and accessible to a wide audience. Whether you've been working with Swift from the very beginning or just getting your start now, we promise that you'll find something to love in everything we make.
About the Author
Mattt (@mattt) is a writer and developer in Portland, Oregon. He spent the last 3 years at Apple as a technical writer, contributing to The Swift Programming Language, Swift Package Manager, and Swift.org. Before that, Mattt founded NSHipster, a weekly publication for iOS and macOS developers, and maintained several open source libraries, including AFNetworking and Alamofire.
About the Illustrator
Lauren Mendez (@littleloboart) is an illustrator, designer, and storyteller living in Vancouver, Washington. Her delightful and expressive illustrations in Flight School evoke the spirit of flight in its golden age, inviting readers to reach new heights of understanding.