FeedBack Please.

[Tony]

if you set the buffer to "." then everything should work well, and you wouldn't need a special case for nils.

Btw, index of -1 refers to the last element in the array.

Quote:

>> [1,2,3][-1]
=> 3

[Tony]

and..

Ruby:

ROWS, COLUMNS = 5, 5 MINE_PERCENTAGE = 0.2 @mine_grid = Array.new(ROWS + 2){Array.new(COLUMNS+2){}} # scatter some mines on the field (1..ROWS).each do |r|   (1..COLUMNS).each do |c|     @mine_grid[r][c] = rand < MINE_PERCENTAGE ? "*" : nil   end end # method to print the field def print_grid   (1..ROWS).each do |r|     (1..COLUMNS).each do |c|       print [nil,0].include?(@mine_grid[r][c]) ? "." : @mine_grid[r][c]     end     print "\n"   end end # method to count the mines around any particular cell def count_cell(r,c)   (@mine_grid[r-1][c-1..c+1] +   @mine_grid[r][c-1..c+1] +   @mine_grid[r+1][c-1..c+1]).count{|a| a == "*"} end # solve everything (1..ROWS).each do |r|   (1..COLUMNS).each do |c|     @mine_grid[r][c] = count_cell(r,c) unless @mine_grid[r][c] == "*"   end end print_grid