bubblesort.rb

module Enumerable
  def bubblesort!
    return self if self.size <= 1
    (self.size - 1).downto(0) do |i|
      0.upto(i - 1) do |j|
        self[j+1], self[j] = self[j], self[j+1] if self[j] > self[j+1]
      end
    end

    self
  end
end