Minesweeper Board Creation

minesweeper.rb

#!/bin/ruby

require 'json'
require 'stringio'


#class here
class MineBoard
    attr_accessor :height, :width, :num_mines, :board
    
    def initialize(h, w, n)
        @height = h
        @width = w
        @num_mines = n        
        @board = Array.new(h){Array.new(w) {0} }
        initialise_board
    end    
    
    def initialise_board
        count = 0
        while count < @num_mines do
           rand_x_axis_value = rand(@width)
           rand_y_axis_value = rand(@height)
           next if @board[rand_x_axis_value][rand_y_axis_value] != 0
            @board[rand_x_axis_value][rand_y_axis_value] = 'X'
            assign_values_for_adjacent_pos(rand_x_axis_value, rand_y_axis_value)
            count+=1
        end
    end
    
    def show_board
       @board.each do |row|
        puts row.join(" ")
       end  
    end    

    private    

    def assign_values_for_adjacent_pos(x, y)         
       @board[x-1][y] += 1 unless x <= 0 
       @board[x+1][y] += 1 unless x >= @width-1 
       @board[x][y+1] += 1 unless y >= @height-1
       @board[x][y-1] += 1 unless y <= 0
    end    
end    
#
# Complete the 'show_board' function below.
#
# The function is expected to return a STRING.
# The function accepts following parameters:
#  1. INTEGER height
#  2. INTEGER width
#  3. INTEGER num_mines
#

def show_board(height, width, num_mines)
    board = MineBoard.new(height, width, num_mines)
    board.show_board
end

fptr = File.open(ENV['OUTPUT_PATH'], 'w')
rand
height = 5

width = 5

num_mines = 6

result = show_board height, width, num_mines

fptr.write result
fptr.write "\n"

fptr.close()