Twiced Technology Gmbh Seedr Refactoring Techniques

Refactoring Techniques

66 classic refactoring techniques organized into 6 categories.

Quick Reference

Technique Selection Guide

For Long/Complex Methods

1. Extract Method - Group related code into named method
2. Extract Variable - Break complex expressions into named parts
3. Replace Temp with Query - Convert temp variables to methods
4. Replace Method with Method Object - When local vars prevent extraction

For Misplaced Features

1. Move Method/Field - Feature used more in another class
2. Extract Class - Class has multiple responsibilities
3. Inline Class - Class does almost nothing

For Data Organization

1. Encapsulate Field/Collection - Public fields need protection
2. Replace Magic Number with Constant - Unclear numeric literals
3. Replace Type Code with Subclasses/State-Strategy - Type codes controlling behavior

For Complex Conditionals

1. Decompose Conditional - Long if/else blocks
2. Replace Conditional with Polymorphism - Type-based switching
3. Replace Nested Conditional with Guard Clauses - Deep nesting
4. Introduce Null Object - Many null checks

For Method Signatures

1. Introduce Parameter Object - Repeating parameter groups
2. Preserve Whole Object - Passing multiple values from same object
3. Separate Query from Modifier - Method has side effects
4. Replace Constructor with Factory Method - Complex object creation

For Inheritance Issues

1. Pull Up Method/Field - Duplicate code in subclasses
2. Push Down Method/Field - Feature only used by some subclasses
3. Extract Superclass/Interface - Common features across classes
4. Replace Inheritance with Delegation - Subclass doesn't truly extend parent

Workflow

1. Identify the smell - Name the specific code smell (e.g., Long Method, Large Class, Long Parameter List, Feature Envy)
2. Select technique - Use the selection guide above
3. Read technique details - Load the appropriate reference file and cite it (e.g., "See Composing Methods for full details")
4. Show before/after - Always include a concrete code example showing the code before and after applying the primary technique
5. Apply incrementally - Make small, verifiable changes
6. Test after each step - Ensure behavior is preserved

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