for (var xOffset = -1; xOffset <= 1; xOffset++) {
        for (var yOffset = -1; yOffset <= 1; yOffset++) {
          var neighborColumn = currentCell.column + xOffset;
          var neighborRow = currentCell.row + yOffset;

          if (this.isValidPosition(neighborColumn, neighborRow)) {
            var neighborCell = this.cells[neighborColumn][neighborRow];

            if (neighborCell != currentCell) {
              neighbors.push(neighborCell);
            }
          }
        }
      }