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1. subscript

   struct Board {
   
       var cells : [[Int]]
   
       init(row:Int, columns:Int) {
           self.cells = [[Int]]()
           for _ in 0..<row {
               self.cells.append([Int](count: columns, repeatedValue: 0))
           }
       }
   
       subscript(row: Int, column: Int) -> Int {
           get {
               return cells[row][column]
           }
   
           set {
               cells[row][column] = newValue
           }
       }
   }
   
   var b = Board(row: 3, columns: 4)
   
   b[1,1] = 1
   
   print(b[1,1])