tic tac toe react

1function Square(props) {
2  return (
3    <button className="square" onClick={props.onClick}>
4      {props.value}
5    </button>
6  );
7}
8
9class Board extends React.Component {
10  renderSquare(i) {
11    return (
12      <Square
13        value={this.props.squares[i]}
14        onClick={() => this.props.onClick(i)}
15      />
16    );
17  }
18
19  render() {
20    return (
21      <div>
22        <div className="board-row">
23          {this.renderSquare(0)}
24          {this.renderSquare(1)}
25          {this.renderSquare(2)}
26        </div>
27        <div className="board-row">
28          {this.renderSquare(3)}
29          {this.renderSquare(4)}
30          {this.renderSquare(5)}
31        </div>
32        <div className="board-row">
33          {this.renderSquare(6)}
34          {this.renderSquare(7)}
35          {this.renderSquare(8)}
36        </div>
37      </div>
38    );
39  }
40}
41
42class Game extends React.Component {
43  constructor(props) {
44    super(props);
45    this.state = {
46      history: [
47        {
48          squares: Array(9).fill(null)
49        }
50      ],
51      stepNumber: 0,
52      xIsNext: true
53    };
54  }
55
56  handleClick(i) {
57    const history = this.state.history.slice(0, this.state.stepNumber + 1);
58    const current = history[history.length - 1];
59    const squares = current.squares.slice();
60    if (calculateWinner(squares) || squares[i]) {
61      return;
62    }
63    squares[i] = this.state.xIsNext ? "X" : "O";
64    this.setState({
65      history: history.concat([
66        {
67          squares: squares
68        }
69      ]),
70      stepNumber: history.length,
71      xIsNext: !this.state.xIsNext
72    });
73  }
74
75  jumpTo(step) {
76    this.setState({
77      stepNumber: step,
78      xIsNext: (step % 2) === 0
79    });
80  }
81
82  render() {
83    const history = this.state.history;
84    const current = history[this.state.stepNumber];
85    const winner = calculateWinner(current.squares);
86
87    const moves = history.map((step, move) => {
88      const desc = move ?
89        'Go to move #' + move :
90        'Go to game start';
91      return (
92        <li key={move}>
93          <button onClick={() => this.jumpTo(move)}>{desc}</button>
94        </li>
95      );
96    });
97
98    let status;
99    if (winner) {
100      status = "Winner: " + winner;
101    } else {
102      status = "Next player: " + (this.state.xIsNext ? "X" : "O");
103    }
104
105    return (
106      <div className="game">
107        <div className="game-board">
108          <Board
109            squares={current.squares}
110            onClick={i => this.handleClick(i)}
111          />
112        </div>
113        <div className="game-info">
114          <div>{status}</div>
115          <ol>{moves}</ol>
116        </div>
117      </div>
118    );
119  }
120}
121
122// ========================================
123
124ReactDOM.render(<Game />, document.getElementById("root"));
125
126function calculateWinner(squares) {
127  const lines = [
128    [0, 1, 2],
129    [3, 4, 5],
130    [6, 7, 8],
131    [0, 3, 6],
132    [1, 4, 7],
133    [2, 5, 8],
134    [0, 4, 8],
135    [2, 4, 6]
136  ];
137  for (let i = 0; i < lines.length; i++) {
138    const [a, b, c] = lines[i];
139    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
140      return squares[a];
141    }
142  }
143  return null;
144}
145

1    useEffect(()=>{
2        //checking winner row and col
3        for (let i = 0; i <= 2; i++){
4            const idx = (i % 3) * 3 // -> 0,3,6
5            //check row
6            if ( (table[idx] + table[idx+1] + table[idx+2] )=== 9 || (table[idx] + table[idx+1] + table[idx+2] ) === 15){
7                setWinner([idx,idx+1,idx+2])
8                gameOver()
9            }
10            //check col
11            if ((table[i] + table[i+3] + table[i+6] )=== 9 || (table[i] + table[i+3] + table[i+6] ) === 15){
12                setWinner([i,i+3,i+6])
13                gameOver()
14            }
15        }
16        //checking winner diagonal
17        if ((table[0] + table[4] + table[8] ) === 15 || (table[0] + table[4] + table[8] ) === 9 ){
18            setWinner([0, 4, 8])
19            gameOver()
20        }
21        if ((table[2] + table[4] + table[6] ) === 9 || (table[2] + table[4] + table[6] ) ===15){
22            setWinner([2, 4, 6])
23            gameOver()
24        }
25        // check if table completed
26        if (table.indexOf(0) === -1){
27            gameOver()
28        }
29    }, [table])
30