Interfacing

gistfile1.rb

module Dog
  def species
    p "I'm a dog"
  end

  def race
    p "I'm a #{self.class.name}"
  end

  # To implement in the interface implementation
  #def bark
  #  raise "Your dog can't bar, because its #bark method is not implemented"
  #end

  [:legs, :bark, :age, :name].each do |meth| 
    define_method(meth){ raise "#{meth} must be implemented" }
  end

end

class FrenchCaniche
  include Dog
  
  def bark
    p "my bark sounds like: 'wouf wouf'" 
  end
end

class Wolf
  include Dog
end

print "\nCaniche:\n"
rex = FrenchCaniche.new
rex.species
rex.race
rex.bark

print "\nWolf:\n"

jake = Wolf.new
jake.species
jake.race
jake.bark