yb66

Neither, I asked a question which you didn't answer and instead decided to respond with ad hominem. Ad hominem is the sign of a lost argument, so either answer the question or remain a loser in this debate.

> Wanting to protect your children does not excuse censorship.

If we're not using principles to protect people, what are they for?

Since we're talking about Wikipedia, let me direct you to an article that may be helpful: http://en.wikipedia.org/wiki/Perfect_solution_fallacy

;-)

Just a reminder of duck typing:

Haskell style => function applied to parameter, e.g f(x) Ruby duck type style => parameter applies function to itself e.g x.f()

An example:

  module Dialable
    def dial
      # do stuff with self
      puts "Dialling..."
    end
  end
  
  # I wouldn't do this, but...
  class String
    include Dialable
  end
  
  # So, phone number as a string can be dialled
  my_phone_number = "01 23 45678"
  my_phone_number.dial
  Dialling...
  
  # I'd rather do this
  class PhoneNumber < String
    include Dialable
  end
  
  my_phone_number = PhoneNumber.new "01 23 45678"
  my_phone_number.dial
  Dialling...
  
  # now you get an error on non phone number strings
  "just a random string".dial
  NoMethodError: undefined method `dial' for "just a random string":String
  
  my_phone_number == "01 23 45678"
  => true
  
  my_phone_number == "just a random string"
  => false