The Object Oriented Way
The Object Oriented Way
How To Solve Problems
About the Book
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How do we solve problems using objects?
That question is the north star of this book. While we happen use C# for all examples in this book, that language is merely a means and not an end. The purpose of this book is to teach the *fundamental ideas in contemporary object oriented programming*.
Who is this book for?
Whether you are a complete novice or a seasoned coder looking to grow, this book is your roadmap to mastering contemporary object orientation. From simple topics like syntax and types all the way to advanced concepts like design patterns and variance.
Why objects?
I believe that the functional way is superior to the object oriented way. So why study objects? Before we criticise the other side, we must understand their arguments better than they do themselves. This book is my attempt at steel-manning the object oriented way, once and for all.
Who am I?
A Senior Lecturer at Uppsala University with a Ph.D. in Information Systems. You might know me from my popular YouTube channel on programming. I have been teaching object oriented concepts for more than a decade. This is the book I wish I had been given and I use it to teach object orientation to university students.
Send feedback to: author@theobjectorientedway.com.
About the Author
Table of Contents
- Preface
- How To Read This Book
- 1.Programming
- 1.1.Algorithms
- 1.2.Computation
- 1.3.Programs
- 1.4.Syntax
- 1.5.Compilation
- 1.6.Execution
- 1.7.Interpretation
- 1.8.Comments
- 2.Data
- 2.1.Values
- 2.2.Variables
- 2.3.Data Types
- 2.4.Constants
- 2.5.Type Checking
- 2.6.Type Inference
- 2.7.Null
- 2.8.Dynamic Types
- 3.Expressions
- 3.1.Arithmetic Operators
- 3.2.Equality Operators
- 3.3.Relational Operators
- 3.4.Logical Operators
- 3.5.String Concatenation
- 3.6.String Interpolation
- 3.7.Assignment Operator
- 3.8.Precedence
- 3.9.Associativity
- 4.Control Flow
- 4.1.Statements
- 4.2.Selection Statements
- 4.3.Selection Expressions
- 4.4.Conditionals Breed
- 4.5.Iteration Statements
- 4.6.Exceptions
- 5.Type Definitions
- 5.1.Make Impossible States Impossible
- 5.2.Enumeration Types
- 5.3.Tuples
- 5.4.Arrays
- 5.5.References and Values
- 6.Methods
- 6.1.Local Functions
- 6.2.Parameters
- 6.3.Return Values
- 6.4.Fat Arrows
- 6.5.Recursion
- 7.Organization
- 7.1.Namespaces
- 7.2.Entry Point
- 7.3.Global Variables Considered Harmful
- 8.Objects
- 8.1.Classes
- 8.2.Fields
- 8.3.Constructors
- 8.4.Instance Methods
- 8.5.The
thisKeyword
- 8.6.Encapsulation
- 8.7.Access Modifiers
- 8.8.Properties
- 8.9.Static
- 8.10.Overloading
- 8.11.Extension Methods
- 9.Object Composition
- 9.1.Dependency Instantiation
- 9.2.Dependency Injection
- 9.3.Tell Don’t Ask
- 9.4.Law of Demeter
- 10.Subtype Polymorphism
- 10.1.Substitutability
- 10.2.Interfaces
- 10.3.Run-Time Type vs Compile-Time Type
- 10.4.Dynamic Dispatch
- 10.5.Replace Conditional With Polymorphism
- 10.6.Don’t Use Subtypes for Data Variation
- 10.7.Multiple Interfaces
- 10.8.Interface Segregation Principle
- 11.Inheritance
- 11.1.Class Inheritance
- 11.2.Overriding
- 11.3.Hiding
- 11.4.The
baseKeyword
- 11.5.Constructor Chaining
- 11.6.Protected Access Modifier
- 11.7.Abstract Classes
- 11.8.Interface Inheritance
- 11.9.Default Interface Methods
- 11.10.Multiple Inheritance
- 11.11.Fragile Base Class Problem
- 12.Type Conversions
- 12.1.Kinds of Type Conversions
- 12.2.Upcasting
- 12.3.Downcasting
- 12.4.Everything Is An Object
- 13.UML Class Diagrams
- 13.1.Classes
- 13.2.Fields
- 13.3.Access Modifiers
- 13.4.Properties
- 13.5.Instance Methods
- 13.6.Constructors
- 13.7.Composition
- 13.8.Interfaces
- 13.9.Inheritance
- 13.10.Abstract
- 14.More Type Definitions
- 14.1.Structure Types
- 14.2.Record Types
- 14.3.Anonymous Types
- 15.Generics
- 15.1.Can Everything Be Generic?
- 15.2.Generic Types
- 15.3.Generics Maintain Static Type Safety
- 15.4.Generic Supertypes
- 15.5.Generic Methods
- 15.6.Type Parameter Constraints
- 15.7.Collections
- 16.Composition Over Inheritance
- 16.1.The Duck Dilemma
- 16.2.Strategy Pattern
- 16.3.Bridge Pattern
- 16.4.Delegates
- 16.5.Generic Delegates
- 16.6.Multicast Delegates
- 16.7.Lambdas
- 17.Dependency Inversion
- 17.1.Dependency Inversion Principle
- 17.2.Factory Method Pattern
- 18.Observers
- 18.1.Observer Pattern
- 18.2.Events
- 18.3.Event-Driven Programming
- 18.4.Asynchronous Programming
- 18.5.Reactive Programming
- 19.Iterators
- 19.1.Iterator Pattern
- 19.2.Enumerables
- 19.3.The
yieldStatement
- 19.4.Lazy Evaluation
- 19.5.Infinite Iterators
- 19.6.LINQ
- 20.Multiple Dynamic Dispatch
- 20.1.Visitor Pattern
- 20.2.Pattern Matching
- 21.Variance
- 21.1.Type Safe Variance
- 21.2.Covariance
- 21.3.Contravariance
- 21.4.Invariance
- 21.5.The Square-Rectangle Problem
- 21.6.Liskov Substitution Principle
- 21.7.Variant Class Inheritance
- 21.8.Variant Delegates
- 21.9.Variant Generic Delegates
- 21.10.Variant Generic Interfaces
- Epilogue
- Preface
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