Mixins: good and evil

mixins.rb

# evil

module MoarMethods
  def foo
  end
  
  def bar
  end
end

class TooManyMethods
  include MoarMethdods
  
  def baz
  end
  
  def quux
  end
end

# good

module Loggable
  def log_method(method_name)
    # metaprogramming magic that taps messages to the implementing class and logs stuff
  end
end

class Beast
  include Loggable
  
  log_method :roar
  
  def roar
    output.append('rrr!')
  end
end