proc_sample2.rb

class Animal
  def initialize(species)
    @species = species
  end
  def bark()
    "bowbow"
  end
  def mew()
    "mewwww"
  end
  def tweet()
    "piyopiyo"
  end
  def makeASound
      l = -> &sound { p @species + " makes a sound"; p sound.call }
      l.call &method(:bark)
      l.call &method(:mew)
      l.call &method(:tweet)
  end
end

Animal.new("Dog").makeASound


# "Dog makes a sound"
# "bowbow"
# "Dog makes a sound"
# "mewwww"
# "Dog makes a sound"
# "piyopiyo"