Long Method
- Problem: Breaks SRP
- Solution: Extract method
Long Class
- Problem: Breaks SRP
- Solution: Extract class
Duplicated Code
- Problem: Changing one feature requires multiple changes in many parts of app
- Solution: Extract class / method
Global Data
- Problem: Accessible anywhere, leads to unpredictable changes
- Solution: Encapsulate variable / collection
Mutable Data
- Problem: Changes from outside leads to unpredictable behavior
- Solution: Encapsulate variable / collection
Shotgun Surgery
- Problem: Changing one feature requires multiple changes in many parts of app
- Solution: Extract class
Feature Envy
- Problem: Method more interested in other class
- Solution: Move method
Primitive Obsession
- Problem: Overuse of primitive type
- Solution: Replace primitive with object
Data Clumps
- Problem: Group of variables that are mostly used together
- Solution: Introduce parameter object
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