The linked content includes a few design patterns implemented with Ruby on Rails.

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What is the card indented to achieve?

• You can use the pattern names for code reviews, so all parties know with only a few words which change is requested. Example: "Please use a form object here"
• You can learn about new code patterns
• You should read the sections "Advantages of using design patterns" and "Disadvantages of using design patterns in a wrong way", since design patterns do not replace good code

Included Design Patterns: Service, Value object, Presenter, Decorator, Builder, Form object, Policy object, Query object, Observer, Interactor and Null object