From: Jones Lee <joneslee85@...>
Date: 2011-09-30T11:48:41+09:00
Subject: Ruby mixin: extend or include?

I have following code:

module CarHelper
  def call_helpline
    puts "Calling helpline..."
  end
end

class Car
  extend CarHelper
end

class Truck
  class << self
    include CarHelper
  end
end

# Test code
Car.call_helpline
Truck.call_helpline

In fact both 2 lines of test codes works. So is there any difference
between the way I use 'extend' and 'include' (inside a singleton class
of self)?

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