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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

Functional programming philosophy

Before we jump into writing code, let's discuss the ideas and motivations behind functional programming.

State and side effects

Functional programming makes it significantly easier to think of each component in isolation. This includes things such as types, functions, and methods. If we can wrap our minds around everything that is input into these code components and everything that should be returned from them, we could analyze the code easily to ensure that there are no bugs and it performs well. Every type is created with a certain number of parameters and each method and function in a program has a certain number of parameters and return values. Normally, we think about these as the only inputs and outputs, but the reality is that often there are more. We refer to these extra inputs and outputs as state.

In a more general sense, state is any stored information, however temporary, that can be changed. Let's consider a simple double function:

func...

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