Dive Into Refactoring

My Notes on book "Dive Into Refactoring" Book.

Chapters

Bad code smells

Bloaters

• Long Method
• Long Parameter List
• Large Class
• Data Clumps
• Primitive Obsession

Object-Orientation Abusers

• Switch Statements
• Temporary Field
• Refused Bequest
• Alternative Classes with Different Interfaces

Change Preventers

• Divergent Change
• Shotgun Surgery
• Parallel Inheritance Hierarchies

Dispensables

• Comments
• Duplicate Code
• Lazy Class
• Data Class
• Dead Code
• Speculative Generality

Couplers

• Feature Envy
• Inappropriate Intimacy
• Message Chains
• Middle Man
• Incomplete Library Class

Refactoring techniques

Composing methods

• Extract Method
• Inline Method
• Extract Variable
• Inline Temp
• Replace Temp with Query
• Split Temporary Variable
• Remove Assignments to Parameters
• Replace Method with Method Object
• Substitute Algorithm

Moving Features between Objects

• Move Method
• Move Field
• Extract Class
• Inline Class
• Hide Delegate
• Remove Middle Man
• Introduce Foreign Method
• Introduce Local Extension

Organizing Data

• Self Encapsulate Field
• Replace Data Value with Object
• Change Value to Reference
• Change Reference to Value
• Replace Array with Object
• Duplicate Observed Data
• Change Unidirectional Association to Bidirectional
• Change Bidirectional Association to Unidirectional
• Replace Magic Number with Symbolic Constant
• Encapsulate Field
• Encapsulate Collection
• Replace Type Code with Class
• Replace Type Code with Subclasses
• Replace Type Code with State/Strategy
• Replace Subclass with Fields

Simplifying Conditional Expressions

• Decompose Conditional
• Consolidate Conditional Expression
• Consolidate Duplicate Conditional Fragments
• Remove Control Flag
• Replace Nested Conditional with Guard Clauses
• Replace Conditional with Polymorphism
• Introduce Null Object
• Introduce Assertion

Simplifying Method Calls

• Rename Method
• Add Parameter
• Remove Parameter
• Separate Query from Modifier
• Parameterize Method
• Replace Parameter with Explicit Methods
• Preserve Whole Object
• Replace Parameter with Method Call
• Introduce Parameter Object
• Remove Setting Method
• Hide Method
• Replace Constructor with Factory Method
• Replace Error Code with Exception
• Replace Exception with Test

Dealing with Generalisation

• Pull Up Field
• Pull Up Method
• Pull Up Constructor Body
• Push Down Method
• Push Down Field
• Extract Subclass
• Extract Superclass
• Extract Interface
• Collapse Hierarchy
• Form Template Method
• Replace Inheritance with Delegation
• Replace Delegation with Inheritance