Ruby fun stuff (class inheritance, etc)

ruby_fun_stuff.rb

    class Parent
      class << self
        attr_accessor :something

        def something(value = nil)
          @something = value ? value : @something
        end

        def inherited(subclass)
            self.instance_variables.each do |var|
                subclass_variable_value = self.instance_variable_get(var).dup
                subclass.instance_variable_set(var, subclass_variable_value)
            end
        end
      end

      attr_accessor :something
      self.something = 'Parent Default'

      def something(value = nil)
        @something = value ? value : @something ? @something : self.class.something
      end
    end

    class Child < Parent
      # inherited form Parent.something
    end

    class GrandChild < Child
      something "GrandChild default"
    end


    Parent.something
    # => "Parent Default" 
    Parent.something = "Parent something else"
    # => "Parent something else" 
    Parent.something
    # => "Parent something else" 
    parent = Parent.new
    # => #<Parent:0x007fc593474900> 
    parent.something
    # => "Parent something else" 
    parent.something = "yet something different"
    # => "yet something different" 
    parent.something
    # => "yet something different" 
    parent.class.something
    # => "Parent something else" 
    Child.something
    # => "Parent Default" 
    child = Child.new
    # => #<Child:0x007fc5934241f8> 
    child.something
    # => "Parent Default" 
    GrandChild.something
    # => "GrandChild default" 
    GrandChild.something("grandchild something else") 
    # => "grandchild something else" 
    GrandChild.something
    # => "grandchild something else" 
    GrandChild.superclass.something
    # => "Parent Default" 
    grandchild = GrandChild.new
    # => #<GrandChild:0x007fc5933e70c8> 
    grandchild.something
    # => "grandchild something else" 
    grandchild.something = "whatever"
    # => "whatever" 
    GrandChild.something
    # => "grandchild something else" 
    grandchild.something
    # => "whatever"