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Swift Protocol-Oriented Programming - Fourth Edition

You're reading from  Swift Protocol-Oriented Programming - Fourth Edition

Product type Book
Published in Jun 2019
Publisher
ISBN-13 9781789349023
Pages 224 pages
Edition 4th Edition
Languages
Author (1):
Jon Hoffman Jon Hoffman
Profile icon Jon Hoffman

Table of Contents (11) Chapters

Preface 1. Starting with the Protocol 2. Our Type Choices 3. Extensions 4. Generics 5. Memory Management 6. Object-Oriented Programming 7. Protocol-Oriented Programming 8. Adopting Design Patterns in Swift 9. Case Studies 10. Other Books You May Enjoy

Value and reference types

There are some fundamental differences between value types (structures, enumerations, and tuples) and reference types (classes). The primary difference is how the instances of value and reference types are passed. When we pass an instance of a value type, we are actually passing a copy of the original instance. This means that the changes made to one instance are not reflected back to the others. When we pass an instance of a reference type, we are passing a reference to the original instance. This means that both references point to the same instance; therefore, a change made to one reference will reflect in the others.

The explanation in the previous paragraph is a pretty straightforward explanation; however, it is a very important concept that you must understand. In this section, we are going to examine the differences between value and reference...

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