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DesignPattern (Anti-pattern and code smells (part 2 (shortgun surgery…

- - - - enough comment
        
        Don't repeat yourself
      - comment for complicated design -> this is the bad design
      - long method
      - large class
      - data clumps
      - long parameter list
  - - - change one place require you to fix many areas
    - - animal class have two type dog and cat-> that's bad
        solution: animal is abstract class, dog and cat class inherit form animal
    - - inherit sth not need
- - - - Client classes become dependent on high level generalizations rather than dependant on low level concrete classes
        
        use interface instead of concrete class
- - - - Singleton
      - Factory
        
        Class
        
        Factory Pattern Method
    - - Facade
      - Adapter
      - Composite
      - Proxy
      - Decorator
    - - State
        
        use state class instead of if(state == ) do else if(state ==) do another thing
      - Command
        
        suitable for undo, redo, etc
      - chain of responsibility pattern
      - mediator
      - Template method pattern
      - Observer