Function playMove

example/tutorial/step3/connect4.js:26–43

(board, player, column, row)

}

function playMove(board, player, column, row) {
  // Check values of arguments.
  if (player !== PLAYER1 && player !== PLAYER2) {
    throw new Error(`player must be ${PLAYER1} or ${PLAYER2}.`);
  }
  const columnElement = board.querySelectorAll(".column")[column];
  if (columnElement === undefined) {
    throw new RangeError("column must be between 0 and 6.");
  }
  const cellElement = columnElement.querySelectorAll(".cell")[row];
  if (cellElement === undefined) {
    throw new RangeError("row must be between 0 and 5.");
  }
  // Place checker in cell.
  if (!cellElement.classList.replace("empty", player)) {
    throw new Error("cell must be empty.");
  }
}

export { PLAYER1, PLAYER2, createBoard, playMove };