Class method lookup

class_method_lookup.rb

class Parent
  class << self
    def who_am_i
      puts "I'm #{self}"
    end
    
    def singleton
      class << self; self; end
    end
  end
end

class Child < Parent
end

c = Child.singleton
until c.nil? do
  puts c.to_s  
  c = c.superclass  
end

#=>  #<Class:Child>
#=>  #<Class:Parent>
#=>  #<Class:Object>
#=>  #<Class:BasicObject>
#=>  Class
#=>  Module
#=>  Object
#=>  BasicObject