TicTacToe in JS

TicTacToe.js

class TicTacToe {
  constructor() {
    this.board = Array(3)
      .fill(null)
      .map(() => Array(3).fill(null));
    this.gameOver = false;
    this.winner = null;
    this.currentPlayer = "X";
    this.winningPositions = [
      [0, 1, 2],
      [3, 4, 5],
      [6, 7, 8],
      [0, 3, 6],
      [1, 4, 7],
      [2, 5, 8],
      [0, 4, 8],
      [2, 4, 6],
    ];
  }
  makeMove(row, col) {
    if (this.gameOver || this.board[row][col] !== null) return;
    this.board[row][col] = this.currentPlayer;
    if (this.checkWin(row, col)) {
      this.winner = this.currentPlayer;
      this.gameOver = true;
    } else {
      this.currentPlayer = this.currentPlayer === "X" ? "O" : "X";
    }
  }

  checkWin(row, col) {
    const player = this.board[row][col];
    for (const [a, b, c] of this.winningPositions) {
      if (
        this.board[Math.floor(a / 3)][a % 3] === player &&
        this.board[Math.floor(b / 3)][b % 3] === player &&
        this.board[Math.floor(c / 3)][c % 3] === player
      ) {
        return true;
      }
    }
  }

  isDraw() {
    if (!this.gameOver) return false;
    for (let row = 0; row < 3; row++) {
      for (let col = 0; col < 3; col++) {
        if (this.board[row][col] === null) return false;
      }
    }
    return true;
  }

  getWinner() {
    return this.winner;
  }

  getCurrentPlayer() {
    return this.currentPlayer;
  }

  isGameOver() {
    return this.gameOver;
  }
}

const game = new TicTacToe();

game.makeMove(0, 0);
game.makeMove(1, 1);
game.makeMove(2, 2);
console.log(game.getCurrentPlayer());
console.log("Winner: ", game.getWinner());
console.log(game.isDraw());
console.log(game.board);