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Swift 3 Object-Oriented Programming

You're reading from   Swift 3 Object-Oriented Programming Implement object-oriented programming paradigms with Swift 3.0 and mix them with modern functional programming techniques to build powerful real-world applications

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Product type Paperback
Published in Feb 2017
Publisher Packt
ISBN-13 9781787120396
Length 370 pages
Edition 2nd Edition
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Author (1):
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Gaston C. Hillar Gaston C. Hillar
Author Profile Icon Gaston C. Hillar
Gaston C. Hillar
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Table of Contents (10) Chapters Close

Preface 1. Objects from the Real World to the Playground FREE CHAPTER 2. Structures, Classes, and Instances 3. Encapsulation of Data with Properties 4. Inheritance, Abstraction, and Specialization 5. Contract Programming with Protocols 6. Maximization of Code Reuse with Generic Code 7. Object-Oriented and Functional Programming 8. Extending and Building Object-Oriented Code 9. Exercise Answers

Taking advantage of operator overloading


Swift allows us to redefine specific operators to work in a different way, based on the classes to which we apply them. For example, we can make comparison operators, such as less than (<) and greater than (>), and return the results of comparing the age value when they are applied to instances of Dog.

Note

The redefinition of operators to work in a specific way when applied to instances of specific classes is known as operator overloading. Swift allows us to overload operators through the usage of operator functions.

An operator that works in one way when applied to an instance of a class might work differently on instances of another class. We can also redefine the overloaded operators to work on specific subclasses. For example, we can make the comparison operators work in a different way in a superclass and its subclass.

We want to be able to compare the age of the different Animal instances using the following binary operators in Swift:

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