ruby-patterns

  class BoardBuilder
    def initialize(width, height)
      @board = Board.new
      @board.width = width
      @board.height = height
      @board.tiles = []
      @board.monsters = []
    end

    def add_tiles(n)
      n.times{ @board.tiles  Board Object
  board = builder.board
  puts board.width
  # => 2
  builder.add_tiles(3)
  builder.add_monsters(2)
  puts board.tiles.size
  # => 3
  puts board.monsters.size
  # => 2