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A lot of Ruby code is "magic". We'll explain the magic and see how it works using the powerful tools Ruby gives us.
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Building a gem can be complicated. Often times you're writing abstract, meta code so it can be used flexibly in situations you'll never imagine. We'll talk about the architecture and design of the noticed gem and how it all works.
The Interface Segregation Principle states that no client should be forced to depend on methods it does not use
Abstractions should not depend upon details. Details should depend upon abstractions
Subclasses should add to a base classes behavior, not replace it
Software entities should be open for extension but closed for modification
See how you can use a form object to improve the way you implement custom and complex forms in Rails
Learn what the Decorator design pattern does and how to implement it from scratch
A class should have only a single responsibility
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