Bubble sorting

sort.rb

class BubbleArray < Array
  def sort
    dup.sort!
  end

  def sort!
    return self if self.size <= 1

    for i in 0...size
      swapped = false

      for j in (i+1)...size
        if (self[i] <=> self[j]) > 0
          swap(i, j)
          swapped = true
        end
      end

      return self unless swapped
    end
  end

  private

  def swap(i, j)
    self[i], self[j] = self[j], self[i]
  end
end

def assert(object, value)
  if object == value
    print '.'
  else
    puts "Error: #{object.inspect} != #{value}"
  end
end

array = BubbleArray[10, 32, 22, 90, 0, -9, 24, 88, 92, 35, 90, 8, 99, 100]

assert(array.sort, [-9, 0, 8, 10, 22, 24, 32, 35, 88, 90, 90, 92, 99, 100])