KANTU-BOT/lib/tictactoe.js

class TicTacToe {
  constructor(playerX = 'x', playerO = 'o') {
    this.playerX = playerX;
    this.playerO = playerO;
    this._currentTurn = false;
    this._x = 0;
    this._o = 0;
    this.turns = 0;
  }

  get board() {
    return this._x | this._o;
  }

  get currentTurn() {
    return this._currentTurn ? this.playerO : this.playerX;
  }

  get enemyTurn() {
    return this._currentTurn ? this.playerX : this.playerO;
  }

  static check(state) {
    for (const combo of [7, 56, 73, 84, 146, 273, 292, 448]) {
      if ((state & combo) === combo) {
        return !0;
      }
    }
    return !1;
  }

  /**
     * ```js
     * TicTacToe.toBinary(1, 2) // 0b010000000
     * ```
     */
  static toBinary(x = 0, y = 0) {
    if (x < 0 || x > 2 || y < 0 || y > 2) throw new Error('invalid position');
    return 1 << x + (3 * y);
  }

  /**
     * @param player `0` is `X`, `1` is `O`
     *
     * - `-3` `Game Ended`
     * - `-2` `Invalid`
     * - `-1` `Invalid Position`
     * - ` 0` `Position Occupied`
     * - ` 1` `Sucess`
     * @return {-3|-2|-1|0|1}
     */
  turn(player = 0, x = 0, y) {
    if (this.board === 511) return -3;
    let pos = 0;
    if (y == null) {
      if (x < 0 || x > 8) return -1;
      pos = 1 << x;
    } else {
      if (x < 0 || x > 2 || y < 0 || y > 2) return -1;
      pos = TicTacToe.toBinary(x, y);
    }
    if (this._currentTurn ^ player) return -2;
    if (this.board & pos) return 0;
    this[this._currentTurn ? '_o' : '_x'] |= pos;
    this._currentTurn = !this._currentTurn;
    this.turns++;
    return 1;
  }

  /**
     * @return {('X'|'O'|1|2|3|4|5|6|7|8|9)[]}
     */
  static render(boardX = 0, boardO = 0) {
    const x = parseInt(boardX.toString(2), 4);
    const y = parseInt(boardO.toString(2), 4) * 2;
    return [...(x + y).toString(4).padStart(9, '0')].reverse().map((value, index) => value == 1 ? 'X' : value == 2 ? 'O' : ++index);
  }

  /**
     * @return {('X'|'O'|1|2|3|4|5|6|7|8|9)[]}
     */
  render() {
    return TicTacToe.render(this._x, this._o);
  }

  get winner() {
    const x = TicTacToe.check(this._x);
    const o = TicTacToe.check(this._o);
    return x ? this.playerX : o ? this.playerO : false;
  }
}

new TicTacToe().turn;

export default TicTacToe;