OOPS v2.0.0-rc.1 - Interfaces and Traits for Ruby
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This document discusses principles of object-oriented programming maintainability such as reuse of behavior, typing and subtyping, and avoiding repetition. It covers different OOP concepts like classes, inheritance, interfaces, mixins and modules. The document suggests using traits for composing units of behavior in a way that is composable and avoids conflicts. Traits should define smaller interfaces than classes. Specifications can also be composed using shared examples. These principles can be achieved in languages like Java 8+, Ruby and Go.
![AdvancedCalc =
SimpleCalcImpl
ProductCalcT
StatsCalcT
- [:product]
+
+
=> AdvancedCalculator](https://image.slidesharecdn.com/drbc16-160806100709/85/OOPS-v2-0-0-rc-1-Interfaces-and-Traits-for-Ruby-43-320.jpg)
OOPS v2.0.0-rc.1 - Interfaces and Traits for Ruby
- 2. Definitions • Type - Set of methods • Subtype(T) - Superset methods of the type T • Class - Implementation of type + properties of implementing object
- 9. Maintainability • Re-use of behaviour
- 10. Maintainability • Re-use of behaviour • Typing and Sub-typing
- 12. Axes of maintainability Don’t repeat yourself (DRY)
- 13. Axes of maintainability Don’t repeat yourself (DRY)
- 14. Axes of maintainability Don’t repeat yourself (DRY) Don’t shoot yourself (DSY)
- 15. Maintainability • Re-use of behaviour • Sub-typing
- 16. Maintainability • Re-use of behaviour • Sub-typing Granularity
- 18. Composability • Behaviour - Inject behaviour from multiple sources • Types - Create superset types by combining smaller types
- 19. Classes • Re-use • Multiple inheritance • Subtyping (Polymorphism) • Multiple inheritance
- 20. Interfaces
- 22. Interfaces • Type definitions • Composable
- 24. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java?
- 25. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java? Ruby?
- 26. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java?
- 27. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java? Ruby?
- 28. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java? Ruby? Interfaces?
- 29. gem install rubycube require “cube” Composable Units of BEhaviour
- 32. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java? Ruby Interfaces
- 33. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java?
- 34. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java? Ruby Interfaces
- 35. DRY DSY Classes / Inheritance Interfaces Mixins / Modules Java? Ruby Interfaces ??
- 36. Conflicts
- 41. (sum, pos, fact)
- 43. AdvancedCalc = SimpleCalcImpl ProductCalcT StatsCalcT - [:product] + + => AdvancedCalculator
- 46. Using Traits • Structural classes - Enforce structural integrity. • Identify interactions - Create smallest possible interface • Traits should be smaller or equal to interfaces • If required - extend structural class to create glue class for required interface • Compose using traits
- 47. Specs • Rspec “shared_examples” • Compose specs using “it_behaves_like”
- 48. Also achievable … • Java 8+ • Golang
- 50. __/__ https://github.com/adityagodbole/rubycube gem install rubycube (please go and read the traits paper)