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Learning Swift Second Edition - Second Edition

You're reading from  Learning Swift Second Edition - Second Edition

Product type Book
Published in Mar 2016
Publisher
ISBN-13 9781785887512
Pages 308 pages
Edition 2nd Edition
Languages
Author (1):
Andrew J Wagner Andrew J Wagner
Profile icon Andrew J Wagner

Table of Contents (19) Chapters

Learning Swift Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
1. Introducing Swift 2. Building Blocks – Variables, Collections, and Flow Control 3. One Piece at a Time – Types, Scopes, and Projects 4. To Be or Not To Be – Optionals 5. A Modern Paradigm – Closures and Functional Programming 6. Make Swift Work For You – Protocols and Generics 7. Everything Is Connected – Memory Management 8. Paths Less Traveled – Error Handling 9. Writing Code the Swift Way – Design Patterns and Techniques 10. Harnessing the Past – Understanding and Translating Objective-C 11. A Whole New World – Developing an App 12. What's Next? – Resources, Advice, and the Next Steps Index

Structs


The most basic way that we can group together data and functionality into a logical unit or object is to define something called a structure. Essentially, a structure is a named collection of data and functions. Actually, we have already seen several different structures because all of the types such as string, array, and dictionary that we have seen so far are structures. Now we will learn how to create our own.

Types versus instances

Let's jump straight into defining our first structure to represent a contact:

struct Contact {
    var firstName: String = "First"
    var lastName: String = "Last"
}

Here we have created a structure by using the struct keyword followed by a name and curly brackets ({}) with code inside them. Just like with a function, everything about a structure is defined inside its curly brackets. However, code in a structure is not run directly, it is all part of defining what the structure is. Think of a structure as a specification for future behavior instead of...

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