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Checking surrounding tiles

If you want to check the surrounding tiles in a series of array.

Instead of using this:

if input[index_r-1]
            result += 1 if input[index_r-1][index_e-1] && input[index_r-1][index_e-1] == "*"
            result += 1 if input[index_r-1][index_e] == "*"
            result += 1 if input[index_r-1][index_e+1] && input[index_r-1][index_e+1] == "*"
          end
         
          result += 1 if input[index_r][index_e-1] && input[index_r][index_e-1] == "*"
          result += 1 if input[index_r][index_e+1] && input[index_r][index_e+1] == "*"
         
          if input[index_r+1]
            result += 1 if input[index_r+1][index_e-1] && input[index_r+1][index_e-1] == "*"
            result += 1 if input[index_r+1][index_e] == "*"
            result += 1 if input[index_r+1][index_e+1] && input[index_r+1][index_e+1] == "*"
end

Please use this

[input[x-1][y-1], input[x-1][y], input[x-1][y+1], input[x][y-1], input[x][y+1], input[x+1][y-1], input[x+1][y], input[x+1][y+1]].count('*')

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