Practical Object-Oriented Design
An Agile Primer Using Ruby
2nd Edition
Published on 10. July 2018
288 pages
978-0-13-444559-5 (ISBN)
Description
The Complete Guide to Writing Maintainable, Manageable, Pleasing, and Powerful Object-Oriented Applications
Object-oriented programming languages exist to help you create beautiful, straightforward applications that are easy to change and simple to extend. Unfortunately, the world is awash with object-oriented (OO) applications that are difficult to understand and expensive to change. Practical Object-Oriented Design, Second Edition, immerses you in an OO mindset and teaches you powerful, real-world, object-oriented design techniques with simple and practical examples.
Sandi Metz demonstrates how to build new applications that can "survive success" and repair existing applications that have become impossible to change. Each technique is illustrated with extended examples in the easy-to-understand Ruby programming language, all downloadable from the companion website, poodr.com. Fully updated for Ruby 2.5, this guide shows how to
Decide what belongs in a single class
Avoid entangling objects that should be kept separate
Define flexible interfaces among objects
Reduce programming overhead costs with duck typing
Successfully apply inheritance
Build objects via composition
Whatever your previous object-oriented experience, this concise guide will help you achieve the superior outcomes you're looking for.
Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.
Object-oriented programming languages exist to help you create beautiful, straightforward applications that are easy to change and simple to extend. Unfortunately, the world is awash with object-oriented (OO) applications that are difficult to understand and expensive to change. Practical Object-Oriented Design, Second Edition, immerses you in an OO mindset and teaches you powerful, real-world, object-oriented design techniques with simple and practical examples.
Sandi Metz demonstrates how to build new applications that can "survive success" and repair existing applications that have become impossible to change. Each technique is illustrated with extended examples in the easy-to-understand Ruby programming language, all downloadable from the companion website, poodr.com. Fully updated for Ruby 2.5, this guide shows how to
Decide what belongs in a single class
Avoid entangling objects that should be kept separate
Define flexible interfaces among objects
Reduce programming overhead costs with duck typing
Successfully apply inheritance
Build objects via composition
Whatever your previous object-oriented experience, this concise guide will help you achieve the superior outcomes you're looking for.
Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.
More details
Edition
2nd edition
Language
English
Place of publication
Boston
United States
Publishing group
Pearson Education (US)
Target group
Professional and scholarly
File size
5,54 MB
ISBN-13
978-0-13-444559-5 (9780134445595)
Copyright in bibliographic data and cover images is held by Nielsen Book Services Limited or by the publishers or by their respective licensors: all rights reserved.
Schweitzer Classification
Other editions
Additional editions
Book
11/2018
2nd Edition
Addison Wesley
€41.68
Shipment within 15-20 days
Person
Sandi Metz is a programmer, teacher, author, and sometime consultant. In the past 30+ years she has written innumerable applications and creates practical solutions that produce working software that is easy to change. She has spoken about object-oriented design and refactoring at international Ruby conferences since 2009.
Content
Introduction xv
Acknowledgments xix
About the Author xxi
Chapter 1: Object-Oriented Design 1
1.1 In Praise of Design 2
1.2 The Tools of Design 4
1.3 The Act of Design 6
1.4 A Brief Introduction to Object-Oriented Programming 10
1.5 Summary 13
Chapter 2: Designing Classes with a Single Responsibility 15
2.1 Deciding What Belongs in a Class 16
2.2 Creating Classes That Have a Single Responsibility 17
2.3 Writing Code That Embraces Change 24
2.4 Finally, the Real Wheel 33
2.5 Summary 35
Chapter 3: Managing Dependencies 37
3.1 Understanding Dependencies 38
3.2 Writing Loosely Coupled Code 41
3.3 Managing Dependency Direction 53
3.4 Summary 59
Chapter 4: Creating Flexible Interfaces 61
4.1 Understanding Interfaces 61
4.2 Defining Interfaces 63
4.3 Finding the Public Interface 65
4.4 Writing Code That Puts Its Best (Inter)Face Forward 77
4.5 The Law of Demeter 80
4.6 Summary 84
Chapter 5: Reducing Costs with Duck Typing 85
5.1 Understanding Duck Typing 85
5.2 Writing Code That Relies on Ducks 95
5.3 Conquering a Fear of Duck Typing 100
5.4 Summary 103
Chapter 6: Acquiring Behavior through Inheritance 105
6.1 Understanding Classical Inheritance 105
6.2 Recognizing Where to Use Inheritance 106
6.3 Misapplying Inheritance 114
6.4 Finding the Abstraction 116
6.5 Managing Coupling between Superclasses and Subclasses 129
6.6 Summary 139
Chapter 7: Sharing Role Behavior with Modules 141
7.1 Understanding Roles 142
7.2 Writing Inheritable Code 158
7.3 Summary 161
Chapter 8: Combining Objects with Composition 163
8.1 Composing a Bicycle of Parts 163
8.2 Composing the Parts Object 168
8.3 Manufacturing Parts 176
8.4 The Composed Bicycle 181
8.5 Deciding between Inheritance and Composition 185
8.6 Summary 191
Chapter 9: Designing Cost-Effective Tests 193
9.1 Intentional Testing 194
9.2 Testing Incoming Messages 202
9.3 Testing Private Methods 215
9.4 Testing Outgoing Messages 217
9.5 Testing Duck Types 221
9.6 Testing Inherited Code 233
9.7 Summary 244
Afterword 245
Index 247
Acknowledgments xix
About the Author xxi
Chapter 1: Object-Oriented Design 1
1.1 In Praise of Design 2
1.2 The Tools of Design 4
1.3 The Act of Design 6
1.4 A Brief Introduction to Object-Oriented Programming 10
1.5 Summary 13
Chapter 2: Designing Classes with a Single Responsibility 15
2.1 Deciding What Belongs in a Class 16
2.2 Creating Classes That Have a Single Responsibility 17
2.3 Writing Code That Embraces Change 24
2.4 Finally, the Real Wheel 33
2.5 Summary 35
Chapter 3: Managing Dependencies 37
3.1 Understanding Dependencies 38
3.2 Writing Loosely Coupled Code 41
3.3 Managing Dependency Direction 53
3.4 Summary 59
Chapter 4: Creating Flexible Interfaces 61
4.1 Understanding Interfaces 61
4.2 Defining Interfaces 63
4.3 Finding the Public Interface 65
4.4 Writing Code That Puts Its Best (Inter)Face Forward 77
4.5 The Law of Demeter 80
4.6 Summary 84
Chapter 5: Reducing Costs with Duck Typing 85
5.1 Understanding Duck Typing 85
5.2 Writing Code That Relies on Ducks 95
5.3 Conquering a Fear of Duck Typing 100
5.4 Summary 103
Chapter 6: Acquiring Behavior through Inheritance 105
6.1 Understanding Classical Inheritance 105
6.2 Recognizing Where to Use Inheritance 106
6.3 Misapplying Inheritance 114
6.4 Finding the Abstraction 116
6.5 Managing Coupling between Superclasses and Subclasses 129
6.6 Summary 139
Chapter 7: Sharing Role Behavior with Modules 141
7.1 Understanding Roles 142
7.2 Writing Inheritable Code 158
7.3 Summary 161
Chapter 8: Combining Objects with Composition 163
8.1 Composing a Bicycle of Parts 163
8.2 Composing the Parts Object 168
8.3 Manufacturing Parts 176
8.4 The Composed Bicycle 181
8.5 Deciding between Inheritance and Composition 185
8.6 Summary 191
Chapter 9: Designing Cost-Effective Tests 193
9.1 Intentional Testing 194
9.2 Testing Incoming Messages 202
9.3 Testing Private Methods 215
9.4 Testing Outgoing Messages 217
9.5 Testing Duck Types 221
9.6 Testing Inherited Code 233
9.7 Summary 244
Afterword 245
Index 247
