conway.rb

class Conway
  LIVE = true
  DEAD = false

  def initialize(width, height)
    @width, @height = width, height

    @board = build_board
  end
  attr_accessor :width, :height
  attr_reader :board

  def build_board
    board = []
    @height.times do
      board << [DEAD] * @width
    end
    board
  end

  def cell(x,y,liveness)
    @board[y][x] = liveness
  end

  def step
    next_board = build_board
    @board = next_board
  end

  def get_cell(x,y)
    @board[y][x]
  end
end

if $0 == __FILE__
  game = Conway.new(3,3)
  # ooo
  # oxo
  # oox
  game.cell(2,2,true)
  game.cell(1,1,true)
  game.step
  # ooo
  # oox
  # oxo

  p game.board
  puts "1,1 should be dead" unless game.get_cell(1,1) == false
  puts "2,2 should be dead" unless game.get_cell(1,1) == false
  puts "1,2 should be live" unless game.get_cell(1,1) == true
  puts "2,1 should be live" unless game.get_cell(1,1) == true
end