replacing an element in nested array ruby

Question

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

  d         


        

Answer 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