replacing an element in nested array ruby

问题

I'm having trouble locating where my issue is in my code. I want to replace specific elements with 'X' if they show up on a bingo board:

class BingoBoard

  def initialize(board)
    @bingo_board = board
  end

  def number_letter

    @letter = ['B','I','N','G','O'].sample
    @number = rand(1..100)

  end

  def checker
    @number
    @bingo_board.map! do |n|

      if n.include?(@number)

        n.map! { |x| x == @number ? 'X' : x}

      else

        n

      end
    end

  end

end

this is the test i'm using to see if my code is running, but X never shows up and I been looking over my code many times now and can't figure out why...:

board = [[47, 44, 71, 8, 88],
        [22, 69, 75, 65, 73],
        [83, 85, 97, 89, 57],
        [25, 31, 96, 68, 51],
        [75, 70, 54, 80, 83]]

new_game = BingoBoard.new(board)

new_game.checker

If anyone can provide insight on what I am missing or not seeing, I would greatly appreciate it!

回答1:

class BingoBoard

  def initialize(board)
    @bingo_board = board
  end

  def number_letter

    @letter = ['B','I','N','G','O'].sample
    @number = rand(1..100)

  end

  def checker
    number_letter
    @bingo_board.each do |n|
      index = n.index(@number)
      n[index] = 'X' unless index.nil?
    end

  end

end

来源：https://stackoverflow.com/questions/29612258/replacing-an-element-in-nested-array-ruby