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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

Functions

All of the code we have explored so far is very linear down the file. Each line is processed one at a time and then the program moves onto the next. This is one of the great things about programming: everything the program does can be predicted by stepping through the program yourself mentally, one line at a time.

However, as your program gets larger, you will notice that there are places that reuse very similar or identical code that you cannot reuse by using loops. Moreover, the more code you write, the harder it becomes to know exactly what it is doing. Code comments can help with that but there is an even better solution to both of these problems and they're called functions. A function is essentially a named collection of code that can be executed and reused by using that name.

There are various different types of functions but each builds on the previous type.

Basic functions

The most basic type of function simply has a name with some static code to be executed later. Let...

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