Code Refactoring Cheatsheet

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The document discusses various refactoring techniques organized into categories including composing methods, moving features between objects, organizing data, simplifying conditional expressions, simplifying method calls, and dealing with generalization. Some specific techniques mentioned are extract method, move method, encapsulate field, replace nested conditional with guard clauses, add parameter, and form template method. The goal of refactoring is to improve the design of existing code through techniques like extracting duplicate code or conditional logic, simplifying interfaces, and managing dependencies between code elements.

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Refactoring Techniques
Composing Methods
Extract Method
Inline Method
Extract Variable
Inline Temp

Replace Temp with Query
Replace Method with Method Object
Split Temporary Variable

Remove Assignments to Parameters
Substitute Algorithm

Moving Features between Objects
Move Method
Move Field
Extract Class
Inline Class

Hide Delegate
Remove Middleman
Introduce Foreign Method

Organizing Data
Self-Encapsulate Field
Encapsulate Field
Change Value to Reference
Change Reference to Value

Replace Data Value with Object
Replace Array with Object
Encapsulate Collection
Change Unidirectional Association to Bidirectional
Change Bidirectional Association to Unidirectional
Replace Magic Number with Symbolic Constant

Duplicate Observed Data
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
Introduce Assertion

Replace Conditional with Polymorphism
Introduce Null Object

Simplifying Method Calls
Rename Method
Add Parameter
Remove Unused Parameter
Separate Query from Modifier
Parameterize Method
Preserve Whole Object
Replace Parameter with Method Call

Replace Parameter with Explicit Methods
Introduce Parameter Object
Remove Setting Method for Immutable Fields
Hide Method that should not be Public

Replace Constructor with Factory Method
Replace Error Code with Exception
Replace Exception with Test

Dealing with Generalization
Pull Up Field
Pull Up Method
Pull Up Constructor Body
Push Down Field

Push Down Method
Extract Subclass
Extract Superclass
Collapse Hierarchy

Extract Interface
Form Template Method
Replace Inheritance with Delegation
Replace Delegation with Inheritance

The document discusses refactoring tips provided by Martin Fowler. It defines refactoring as improving the internal structure of software without changing its external behavior. It provides examples of common refactoring techniques like extract method, inline method, move method, and consolidate conditional expressions. The goal of refactoring is to improve code quality by making software easier to understand and modify over time.

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The document discusses various refactoring techniques for restructuring code to improve design, readability, and extensibility without changing external behavior. It provides examples of techniques like extracting methods, replacing temporary variables, simplifying conditional expressions, and dealing with generalization through inheritance/polymorphism. The techniques are organized into categories like composing methods, organizing data, simplifying method calls, and dealing with generalization.

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Code Refactoring Cheatsheet

1. Refactoring Techniques Composing Methods Extract Method Inline Method Extract Variable Inline Temp

2. Replace Temp with Query Replace Method with Method Object Split Temporary Variable

3. Remove Assignments to Parameters Substitute Algorithm

4. Moving Features between Objects Move Method Move Field Extract Class Inline Class

5. Hide Delegate Remove Middleman Introduce Foreign Method

6. Introduce Local Extension

7. Organizing Data Self-Encapsulate Field Encapsulate Field Change Value to Reference Change Reference to Value

8. Replace Data Value with 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 Replace Type Code with Class Replace Type Code with Subclasses

10. Replace Type Code with State/Strategy Replace Subclass with Fields

11. Simplifying Conditional Expressions Decompose Conditional Consolidate Conditional Expression Consolidate Duplicate Conditional Fragments Remove Control Flag

12. Replace Nested Conditional with Guard Clauses Introduce Assertion

13. Replace Conditional with Polymorphism Introduce Null Object

14. Simplifying Method Calls Rename Method Add Parameter Remove Unused Parameter Separate Query from Modifier Parameterize Method Preserve Whole Object Replace Parameter with Method Call

15. Replace Parameter with Explicit Methods Introduce Parameter Object Remove Setting Method for Immutable Fields Hide Method that should not be Public

16. Replace Constructor with Factory Method Replace Error Code with Exception Replace Exception with Test

17. Dealing with Generalization Pull Up Field Pull Up Method Pull Up Constructor Body Push Down Field

18. Push Down Method Extract Subclass Extract Superclass Collapse Hierarchy

19. Extract Interface Form Template Method Replace Inheritance with Delegation Replace Delegation with Inheritance

Code Refactoring Cheatsheet

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