pipe.rb

class Object
  def pipe(meth, obj = self, args = [])
    obj.public_send(meth, self, *args)
  end
end

class Doubler
  def double(c); c.map{|v| v*2} end
end

class Joiner
  def join(c); c.join(',') end
end

[1,2,3,4].pipe(:double, Doubler.new).pipe(:join, Joiner.new)
# => "2,4,6,8"