| name | refactorings |
| description | Refactoring catalog based on Martin Fowler's work. Covers composing methods (extract/inline function, extract variable), moving features (move function/field), organising data (split variable, encapsulate record/collection), simplifying conditionals (decompose/consolidate conditional, replace with polymorphism), dealing with inheritance (pull up/push down, replace superclass with delegate), and more. Use when refactoring code, choosing specific refactoring techniques, or during code review. |
| license | MIT |
| metadata | {"author":"itzcull"} |
Purpose
Provide a comprehensive catalog of refactoring operations that improve code structure without changing external behaviour. Each refactoring describes a specific, mechanical transformation with clear motivation and mechanics.
When to use
- Refactoring code during the REFACTOR step of TDD
- Choosing the right refactoring technique for a code smell
- Code review discussions about structural improvements
- Learning specific refactoring mechanics
- Teaching refactoring techniques to team members
Categories
Composing methods
Extract Function, Inline Function, Extract Variable, Inline Variable, Change Function Declaration, Encapsulate Variable, Rename Variable, Introduce Parameter Object, Combine Functions into Class/Transform, Split Phase
Moving features
Move Function, Move Field, Move Statements into/out of Function, Replace Inline Code with Function Call, Slide Statements, Split Loop, Replace Loop with Pipeline
Organising data
Split Variable, Rename Field, Replace Derived Variable with Query, Change Reference to Value (and reverse), Encapsulate Record, Encapsulate Collection, Replace Primitive with Object
Simplifying conditionals
Decompose Conditional, Consolidate Conditional Expression, Replace Conditional with Polymorphism, Introduce Special Case, Introduce Assertion, Remove Flag Argument
Dealing with generalisation
Pull Up Method/Field/Constructor Body, Push Down Method/Field, Replace Type Code with Subclasses, Remove Subclass, Extract Superclass, Collapse Hierarchy, Replace Superclass with Delegate
Other
Parameterize Function, Preserve Whole Object, Remove Dead Code, Remove Middle Man, Remove Setting Method, Replace Constructor with Factory Function, Replace Function with Command, Replace Parameter with Query (and reverse), Replace Query with Parameter, Substitute Algorithm, Hide Delegate, Inline Class, Extract Class
Reference files
