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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

Computer data storage


Before we start looking at the code, we need to understand in some detail how data is represented in a computer. The common cliché is that all data in a computer is in 1s and 0s. This is true, but not so important when talking about memory management. Instead, we are concerned about where the data is stored. All computers, whether a desktop, laptop, tablet, or phone, store data in two places.

The first place we normally think of is the file system. It is stored on a dedicated piece of hardware; this is called a hard disk drive in many computers, but more recently, some computers have started to use solid-state drives. The other thing we hear about when buying computers is the amount of "memory" it has. Computer memory comes in "sticks" which hold less information than normal drives. All data, even if primarily stored on the Internet somewhere, must be loaded into the computer's memory so that we can interact with it.

Let's take a look at what that means for us as programmers...

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