[Head First Design Patterns] Strategy Pattern

Design pattern pros

• give you a shared volcabulary with other developers -> easily communicate with other devs and inspire who dont know start learning them.
• elevate your thinking about architecture by letting you think at pattern level, not a nitty gritty object level

Common design principles

Interface, Abtract class and Mixin

• Interface: including abtract methods, no concrete method and internal state
• Abtract class: including abtract methods, concrete methods and internal state
• Mixins: including abtract methods, concrete methods but no internal state

SimUDuck app

Design principles

• Identify the aspects of your application that vary and seperate them from what stays the same (encapsulate what varies)
• Program to an interface, not an implementation
  • for some languages like Python which supports multi-inheritance, program an abstract class is acceptable
  • but always keep in mind that program an interface always fexible to create your own implementation
• Favor composition over inheritance

  Pattern

• Strategy pattern defines a family of algorithms, encapsulates each one and makes them interchangeable