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Learning Swift Second Edition

Learning Swift Second Edition

By : Andrew J Wagner
5 (1)
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Learning Swift Second Edition

Learning Swift Second Edition

5 (1)
By: Andrew J Wagner

Overview of this book

Swift is Apple’s new programming language and the future of iOS and OS X app development. It is a high-performance language that feels like a modern scripting language. On the surface, Swift is easy to jump into, but it has complex underpinnings that are critical to becoming proficient at turning an idea into reality. This book is an approachable, step-by-step introduction into programming with Swift for everyone. It begins by giving you an overview of the key features through practical examples and progresses to more advanced topics that help differentiate the proficient developers from the mediocre ones. It covers important concepts such as Variables, Optionals, Closures, Generics, and Memory Management. Mixed in with those concepts, it also helps you learn the art of programming such as maintainability, useful design patterns, and resources to further your knowledge. This all culminates in writing a basic iOS app that will get you well on your way to turning your own app ideas into reality.
Table of Contents (14 chapters)
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13
Index

Extending system types to reduce code


Another powerful feature that we briefly covered in Chapter 3, One Piece at a Time – Types, Scopes, and Projects is the ability to extend existing types. We saw that we could add an extension to the string type that would allow us to repeat the string multiple times. Let's look at a more practical use case for this and discuss its benefits in terms of improving our code.

Perhaps we are creating a grade-tracking program where we are going to be printing out a lot of percentages. A great way to represent percentages is by using a float with a value between zero and one. Floats are great for percentages because we can use the built-in math functions and they can represent pretty granular numbers. The hurdle to cross when using a float to represent a percentage is printing it out. If we simply print out the value, it will most likely not be formatted the way we would want. People prefer percentages to be out of 100 and have a percent symbol after it.

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