Long function

• problem: they are really difficult to understand and you need to set a proper name. Take into account
• solution: Extract it to another function or class[refactor sets.md)

Mysterious name

• problem: any name of variables, functions or classes that don't communicate what it does or how to use it
• solution: * Rename them
• If there is no good name, may be a sign of bad design

duplicated code

• problem: you have the same structure in different parts of the code
• solution: extract to a function / class

long parameter list

• problem: too complicated to handle
• solution: use semantic objects such DTOs