Code Smells

From the Martin Fowler's Refactoring book (2nd edition).

I got the categorization from Sandi Metz in 99 Bottles of OOP.

Bloaters

• Long Function
• Long Class
• Data Clumps (data being passed together, probably they should be in an object)
• Long Parameter List
• Primitive Obsession (if you need to supply behavior, probably you need a smarter object)

Abusers

• Repeated Switches (conditionals)
• Refused Bequest
• Alternative Classes with Different Interfaces
• Temporary Field
• Global Data
• Mutable Data

Preventers

• Divergent Change
• Shotgun Surgery (when you want to change a behavior and need to change several places)
• Mysterious Name

Dispensables

• Lazy Element
• Speculative Generality
• Data Class
• Duplicated Code
• Comments
• Loops

Couplers

• Feature Envy
• Insider Trading
• Message Chains
• Middle Man