gistfile1.rb

class Dog
  def initialize(name)
    @name = name
  end

  def bark
    "#{@name} barks like a dog"
  end

  def eat
    "#{@name} eats like a dog"
  end

  def chase_cat
    "#{@name} chases cats like a dog"
  end

  def teach_trick(trick, &block)
    instance_eval %{
      def #{trick}
        "#{instance_eval &block}"
      end
    }
  end

  def method_missing(method)
    "#{@name} doesn't know how to #{method}!"
  end
end

d = Dog.new('Fido')
puts d.bark
puts d.chase_cat
d.teach_trick('fly') {"#{@name} Flies like a bird"}
puts d.fly
puts Dog.new('Barky').fly