Chapter 5, Contract Programming with Protocols
by Gastón C. Hillar
Swift 3 ObjectOriented Programming - Second Edition
- Swift 3 ObjectOriented Programming - Second Edition
- Swift 3 ObjectOriented Programming - Second Edition
- Credits
- About the Author
- Acknowledgement
- About the Reviewer
- www.PacktPub.com
- Customer Feedback
- Preface
- 1. Objects from the Real World to the Playground
- Installing the required software on Mac OS
- Installing the required software on Ubuntu Linux
- Working with Swift 3 on the web
- Capturing objects from the real world
- Generating classes to create objects
- Recognizing variables and constants to create properties
- Recognizing actions to create methods
- Organizing classes with UML diagrams
- Working with API objects in the Xcode Playground
- Exercises
- Test your knowledge
- Summary
- 2. Structures, Classes, and Instances
- Understanding structures, classes, and instances
- Understanding initialization and its customization
- Understanding deinitialization and its customization
- Understanding automatic reference counting
- Declaring classes
- Customizing initialization
- Customizing deinitialization
- Creating the instances of classes
- Exercises
- Test your knowledge
- Summary
- 3. Encapsulation of Data with Properties
- Understanding elements that compose a class
- Declaring stored properties
- Generating computed properties with setters and getters
- Combining setters, getters, and a related property
- Understanding property observers
- Transforming values with setters and getters
- Creating values shared by all the instances of a class with type properties
- Creating mutable classes
- Building immutable classes
- Exercises
- Test your knowledge
- Summary
- 4. Inheritance, Abstraction, and Specialization
- Creating class hierarchies to abstract and specialize behavior
- Understanding inheritance
- Declaring classes that inherit from another class
- Overriding and overloading methods
- Overriding properties
- Controlling whether subclasses can or cannot override members
- Working with typecasting and polymorphism
- Taking advantage of operator overloading
- Declaring compound assignment operator functions
- Declaring unary operator functions
- Declaring operator functions for specific subclasses
- Exercises
- Test your knowledge
- Summary
- 5. Contract Programming with Protocols
- Understanding how protocols work in combination with classes
- Declaring protocols
- Declaring classes that adopt protocols
- Taking advantage of the multiple inheritance of protocols
- Combining inheritance and protocols
- Working with methods that receive protocols as arguments
- Downcasting with protocols and classes
- Treating instances of a protocol type as a different subclass
- Specifying requirements for properties
- Specifying requirements for methods
- Combining class inheritance with protocol inheritance
- Exercises
- Test your knowledge
- Summary
- 6. Maximization of Code Reuse with Generic Code
- Understanding parametric polymorphism and generic code
- Declaring a protocol to be used as a constraint
- Declaring a class that conforms to multiple protocols
- Declaring subclasses that inherit the conformance to protocols
- Declaring a class that works with a constrained generic type
- Using a generic class for multiple types
- Combining initializer requirements in protocols with generic types
- Declaring associated types in protocols
- Creating shortcuts with subscripts
- Declaring a class that works with two constrained generic types
- Using a generic class with two generic type parameters
- Inheriting and adding associated types in protocols
- Generalizing existing classes with generics
- Extending base types to conform to custom protocols
- Test your knowledge
- Exercises
- Summary
- 7. Object-Oriented and Functional Programming
- Refactoring code to take advantage of object-oriented programming
- Understanding functions as first-class citizens
- Working with function types within classes
- Creating a functional version of array filtering
- Writing equivalent closures with simplified code
- Creating a data repository with generics and protocols
- Filtering arrays with complex conditions
- Using map to transform values
- Combining map with reduce
- Chaining filter, map, and reduce
- Solving algorithms with reduce
- Exercises
- Test your knowledge
- Summary
- 8. Extending and Building Object-Oriented Code
- Putting together all the pieces of the object-oriented puzzle
- Adding methods with extensions
- Adding computed properties to a base type with extensions
- Declaring new convenience initializers with extensions
- Defining subscripts with extensions
- Working with object-oriented code in iOS apps
- Adding an object-oriented data repository to a project
- Interacting with an object-oriented data repository through Picker View
- Exercises
- Test your knowledge
- Summary
- 9. Exercise Answers
- Chapter 1, Objects from the Real World to Playground
- Chapter 2, Structures, Classes, and Instances
- Chapter 3, Encapsulation of Data with Properties
- Chapter 4, Inheritance, Abstraction, and Specialization
- Chapter 5, Contract Programming with Protocols
- Chapter 6, Maximization of Code Reuse with Generic Code
- Chapter 7, Object-Oriented Programming and Functional Programming
- Chapter 8, Protection and Organization of Code
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