Refactoring in Ruby

Foreword xvii Preface xix About the Authors xxiii Part I: The Art of Refactoring 1 Chapter 1: A Refactoring Example 3 Sparkline Script 3 Consistency 6 Testability 8 Greedy Methods 8 Greedy Module 9 Comments 10 Whole Objects 11 Feature Envy 12 Uncommunicative Names 14 Derived Values 15 Wabi-Sabi 17 Summing Up 18 What,s Next 18 Chapter 2: The Refactoring Cycle 19 What Is Refactoring? 19 Smells Are Problems 20 The Refactoring Cycle 21 When Are We Done? 21 Test-Driven/Behavior-Driven Development 22 Exercise 23 What,s Next 23 Chapter 3: Refactoring Step by Step 25 The Refactoring Environment 25 Inside a Refactoring 26 The Generic Refactoring Micro-Process 30 Exercises 33 What,s Next 33 Chapter 4: Refactoring Practice 35 Read Other Books 35 Practice Refactoring 35 Exercises to Try 36 Participate in the Community 37 Exercise 38 What,s Next 38 Part II: Code Smells 39 Chapter 5: Measurable Smells 41 Comments 42 Long Method 44 Large Module 46 Long Parameter List 48 Exercises 49 Chapter 6: Names 57 Type Embedded in Name 59 Uncommunicative Name 60 Inconsistent Names 61 Exercises 62 Chapter 7: Unnecessary Complexity 65 Dead Code 66 Speculative Generality 68 Greedy Method 70 Procedural Code 72 Dynamic Code Creation 74 Exercises 76 Chapter 8: Duplication 79 Derived Value 80 Repeated Value 81 Duplicated Code 83 Alternative Modules with Different Interfaces 85 Exercises 86 Chapter 9: Conditional Logic 93 Nil Check 94 Special Case 96 Complicated Boolean Expression 98 Control Coupling 100 Simulated Polymorphism 101 Exercises 103 Chapter 10: Data 107 Open Secret 108 Data Class 110 Data Clump 112 Temporary Field 114 Exercises 115 Chapter 11: Inheritance 125 Implementation Inheritance 126 Refused Bequest 128 Inappropriate Intimacy (Subclass Form) 130 Lazy Class 131 Exercises 133 Chapter 12: Responsibility 135 Feature Envy 136 Utility Function 138 Global Variable 140 Inappropriate Intimacy (General Form) 141 Message Chain 143 Middle Man 145 Greedy Module 146 Exercises 148 Chapter 13:

William C. Wake is a senior consultant with Industrial Logic, Inc. From 2007 to early 2009, he managed development at Gene Codes Forensics, Inc., a producer of bioinformatics software. From 2001 through 2006, he was an independent consultant focused on agile software. He,s the author of the Refactoring Workbook (Addison-Wesley, 2004) and coauthor of Design Patterns in Java (Addison-Wesley, 2006). His web site is www.xp123.com. Kevin Rutherford, Ph.D., is an independent agile and TDD coach based in the United Kingdom. He has worked in software development for more than 25 years, and since 1997 has been coaching organizations to become highly responsive service providers. He founded the U.K.,s AgileNorth group and is regularly involved on the agile conference circuit. His working practices focus on use of the Theory of Constraints and code quality, and he is the author of the Reek tool for Ruby. His web site is www.kevinrutherford.co.uk.