Code Refactoring Cheatsheet

Code Refactoring Cheatsheet

• 1.
  Refactoring Techniques Composing Methods ExtractMethod Inline Method Extract Variable Inline Temp
• 2.
  Replace Temp withQuery Replace Method with Method Object Split Temporary Variable
• 3.
  Remove Assignments toParameters Substitute Algorithm
• 4.
  Moving Features betweenObjects Move Method Move Field Extract Class Inline Class
• 5.
  Hide Delegate Remove Middleman IntroduceForeign Method
• 6.
  Introduce Local Extension
• 7.
  Organizing Data Self-Encapsulate Field EncapsulateField Change Value to Reference Change Reference to Value
• 8.
  Replace Data Valuewith Object Replace Array with Object Encapsulate Collection Change Unidirectional Association to Bidirectional Change Bidirectional Association to Unidirectional Replace Magic Number with Symbolic Constant
• 9.
  Duplicate Observed Data ReplaceType Code with Class Replace Type Code with Subclasses
• 10.
  Replace Type Codewith State/Strategy Replace Subclass with Fields
• 11.
  Simplifying Conditional Expressions DecomposeConditional Consolidate Conditional Expression Consolidate Duplicate Conditional Fragments Remove Control Flag
• 12.
  Replace Nested Conditionalwith Guard Clauses Introduce Assertion
• 13.
  Replace Conditional withPolymorphism Introduce Null Object
• 14.
  Simplifying Method Calls RenameMethod Add Parameter Remove Unused Parameter Separate Query from Modifier Parameterize Method Preserve Whole Object Replace Parameter with Method Call
• 15.
  Replace Parameter withExplicit Methods Introduce Parameter Object Remove Setting Method for Immutable Fields Hide Method that should not be Public
• 16.
  Replace Constructor withFactory Method Replace Error Code with Exception Replace Exception with Test
• 17.
  Dealing with Generalization PullUp Field Pull Up Method Pull Up Constructor Body Push Down Field
• 18.
  Push Down Method ExtractSubclass Extract Superclass Collapse Hierarchy
• 19.
  Extract Interface Form TemplateMethod Replace Inheritance with Delegation Replace Delegation with Inheritance