本当にひどいコードです。

doala.rb

class Doala
  def move(number)
    hand = -> (n) { n % 2 == 0 ? '⌒' : 'ー' }

    f = Fiber.new do
      n = 0
      reverse = false
      line_length = 50
      loop do
        line = "\r" + " " * n + '(' + hand.call(n) + '(´・△・`)' + hand.call(n) + '⌒)'
        line_fill = 50 - line.length
        Fiber.yield(line + " " * line_fill)
        sleep 0.1
        if reverse
          n -= 1
        else
          n += 1
        end
        reverse = true if n == line_length / 2
        reverse = false if n == 0
      end
    end

    number.times do
      print f.resume
    end
  end
end

Doala.new.move 200