What Is Self?

gistfile1.rb

class SelfMaker
  def yet_what_is_self?
    self.class.class_eval do
      mirror(self, "Inside class_eval of SelfMaker#yet_what_is_self?")
    end
    
    instance_eval do
      mirror(self, "Inside instance_eval of SelfMaker#yet_what_is_self?")
    end
    
    mirror(self, "Inside SelfMaker#yet_what_is_self?")
  end
  
  def mirror(for_self, context)
    puts "Where Am I? #{context}"
    puts "Who Am I? #{for_self} (My class is: #{for_self.class})"
    puts "my object_id: #{for_self.object_id}\n"
  end
  
  def self.mirror(for_self, context)
    self.new.mirror(for_self, context)
  end
    
end

a_self_is_born = SelfMaker.new
a_self_is_born.yet_what_is_self?


# >> Where Am I? Inside class_eval of SelfMaker#yet_what_is_self?
# >> Who Am I? SelfMaker (My class is: Class)
# >> my object_id: 70352810302640

# >> Where Am I? Inside instance_eval of SelfMaker#yet_what_is_self?
# >> Who Am I? #<SelfMaker:0x007ff89488b8c0> (My class is: SelfMaker)
# >> my object_id: 70352810302560

# >> Where Am I? Inside SelfMaker#yet_what_is_self?
# >> Who Am I? #<SelfMaker:0x007ff89488b8c0> (My class is: SelfMaker)
# >> my object_id: 70352810302560

Basically, doing "foo".instance_eval{ self } is what I meant.

Ah, I see :)