CODEWITHSUNDEEP
ruby
user290870
user290870

Reputation: 1601

ruby nested classes and modules

I am familiar with the concept of nesting classes and modules within another module and grouping them in a namespace. What is the idea / purpose behind

  1. Nesting classes within another class

    class A
  class B
    def method_B
      ...
    end
  end
end

  2. Nesting modules within another class

    class A
  module c
    def method_c
      ...
    end
  end
end

thanks, ash

Upvotes: 3

Views: 3871

Answers (2)

Chuck
Chuck

Reputation: 237010

Classes are also namespaces, so it's the same idea. Class is a subclass of Module, so if you get it in the context of modules, you also get it in the context of classes.

Upvotes: 3

Ben Hughes
Ben Hughes

Reputation: 14185

It is all about grouping related concerns while exposing sensible semantics. As an example of number 1 an HTTP::Request (Request class embedded in a larger HTTP protocol class) is a quite different thing from an FTP::Request. With modules it enables the common ruby idiom of Behavior::InstanceMethods and Behavior::ClassMethods for handling mixins.

Upvotes: 1

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