Rubinius' String#reverse

gistfile1.rbx

  # Returns a new string with the characters from <i>self</i> in reverse order.
  #
  #   "stressed".reverse   #=> "desserts"
  def reverse
    self.dup.reverse!
  end

  # Reverses <i>self</i> in place.
  def reverse!
    return self if @bytes <= 1
    self.modify!

    i = 0
    j = @bytes - 1
    while i < j
      @data[i], @data[j] = @data[j], @data[i]
      i += 1
      j -= 1
    end
    self
  end