我的方法是输出整个数组而不是该数组中的整数

Question

我正在创建一个井字游戏，我希望计算机根据棋盘上可用的获胜组合进入战略位置。出于某种原因，computer_index 方法一直有效，直到turn_count == 4，它输出整个WIN_COMBINATIONS 数组而不是一个值。可以理解，这会在 valid_move? 方法中产生错误。相关错误及代码如下。

Traceback (most recent call last):
    3: from tictactoe.rb:12:in `<main>'
    2: from /Users/irosen419/Flatiron/code/tictactoe/tic_tac_toe.rb:201:in `play'
    1: from /Users/irosen419/Flatiron/code/tictactoe/tic_tac_toe.rb:117:in `comp_turn'
/Users/irosen419/Flatiron/code/tictactoe/tic_tac_toe.rb:40:in `valid_move?': undefined method `between?' for #<Array:0x00007fbe650d8268> (NoMethodError)

WIN_COMBINATIONS = [[0, 1, 2], [3, 4, 5], [6, 7, 8], [0, 4, 8], [2, 4, 6], [0, 3, 6], [1, 4, 7], [2, 5, 8]]

def valid_move?(index)
  index.between?(0,8) && !position_taken?(index)
end

def computer_index
  if turn_count == 0
    CORNERS.sample
  elsif turn_count == 2
    CORNERS.sample
  elsif turn_count == 4 || turn_count == 6
    WIN_COMBINATIONS.each do |combo|
      if @board[combo[0]] == "X" && @board[combo[1]] == "X"
          @board[combo[2]]
      elsif @board[combo[1]] == "X" && @board[combo[2]] == "X"
        @board[combo[0]]
      elsif @board[combo[0]] == "X" && @board[combo[2]] == "X"
        @board[combo[1]]
      elsif @board[combo[0]] == "O" && @board[combo[1]] == "O"
          @board[combo[2]]
      elsif @board[combo[1]] == "O" && @board[combo[2]] == "O"
        @board[combo[0]]
      elsif @board[combo[0]] == "O" && @board[combo[2]] == "O"
        @board[combo[1]]
      else
        CORNERS.sample
      end
    end
  else
    @board.each do |space|
      if space == " "
        space
      end
    end
  end
end

def comp_turn
  index = computer_index
  if valid_move?(index)
    move(index, current_player)
    display_board
  else
    comp_turn
  end
end

def turn_count
  count = 0
  @board.each do |space|
    if space == "X" || space == "O"
      count +=1
    end
  end
  count
end

Answer 1

我认为您缺少return 声明：

def computer_index
  if turn_count == 0
    CORNERS.sample
  elsif turn_count == 2
    CORNERS.sample
  elsif turn_count == 4 || turn_count == 6
    WIN_COMBINATIONS.each do |combo|
      if @board[combo[0]] == "X" && @board[combo[1]] == "X"
        return @board[combo[2]]
      elsif @board[combo[1]] == "X" && @board[combo[2]] == "X"
        return @board[combo[0]]
      elsif @board[combo[0]] == "X" && @board[combo[2]] == "X"
        return @board[combo[1]]
      elsif @board[combo[0]] == "O" && @board[combo[1]] == "O"
        return @board[combo[2]]
      elsif @board[combo[1]] == "O" && @board[combo[2]] == "O"
        return @board[combo[0]]
      elsif @board[combo[0]] == "O" && @board[combo[2]] == "O"
        return @board[combo[1]]
      else
        return CORNERS.sample
      end
    end
  else
    @board.each do |space|
      if space == " "
        space
      end
    end
  end
end