towers_of_hanoi

gistfile1.txt

class TowersOfHanoi
  attr_reader :towers

  def initialize(towers = [[3,2,1],[],[]])
    @towers = towers
  end

  def move(from_tower, to_tower)
    @towers[to_tower] << @towers[from_tower].pop
  end

  def valid_move?(from_tower, to_tower)
    if @towers[from_tower].length == 0
      return false
    end
    (@towers[to_tower].last < @towers[from_tower].last) || @towers[to_tower].length == 0
  end
end