freezing.

gistfile1.rb

class Freeza # you can define a class once
 def hello
   puts "hello"
 end
end

f = Freeza.new
f.hello

class Freeza # twice
  def goodbye
    puts "goodbye"
  end
end

f.goodbye

Freeza.freeze # freeze the lady

begin

  class Freeza
    def hello
      puts "is it me you're looking for"
    end
  end # this will give out an error, as the class is frozen

rescue RuntimeError
  puts "Get back to where you once belonged"
end

# what you have to do is inherit from that class and change variables to be of the class
class Defrosted < Freeza
  def hellohello
    puts "hello hello"
  end
end

f = Defrosted.new

# thats all good, but you might want to keep the state between objects
# so the values from the old class need copying between them.

f.hellohello # not very flexible, as you are just redefining a class

# lets make a module instead
module MoCowBell
  def donk
    puts "donk"
  end
end

# i want the variable f to make cowbell noises
f.extend MoCowBell
f.donk