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              <div id="errors" style="
  background: #c00;
  color: #fff;
  display: none;
  margin: -20px -20px 20px;
  padding: 20px;
  white-space: pre-wrap;
"></div>
<div id="root"></div>
<script>
window.addEventListener('mousedown', function(e) {
  document.body.classList.add('mouse-navigation');
  document.body.classList.remove('kbd-navigation');
});
window.addEventListener('keydown', function(e) {
  if (e.keyCode === 9) {
    document.body.classList.add('kbd-navigation');
    document.body.classList.remove('mouse-navigation');
  }
});
window.addEventListener('click', function(e) {
  if (e.target.tagName === 'A' && e.target.getAttribute('href') === '#') {
    e.preventDefault();
  }
});
window.onerror = function(message, source, line, col, error) {
  var text = error ? error.stack || error : message + ' (at ' + source + ':' + line + ':' + col + ')';
  errors.textContent += text + '\n';
  errors.style.display = '';
};
console.error = (function(old) {
  return function error() {
    errors.textContent += Array.prototype.slice.call(arguments).join(' ') + '\n';
    errors.style.display = '';
    old.apply(this, arguments);
  }
})(console.error);
</script>

            
          
!
            
              body {
  font: 14px "Century Gothic", Futura, sans-serif;
  margin: 20px;
}

ol, ul {
  padding-left: 30px;
}

.board-row:after {
  clear: both;
  content: "";
  display: table;
}

.status {
  margin-bottom: 10px;
}

.square {
  background: #fff;
  border: 1px solid #999;
  float: left;
  font-size: 24px;
  font-weight: bold;
  line-height: 34px;
  height: 34px;
  margin-right: -1px;
  margin-top: -1px;
  padding: 0;
  text-align: center;
  width: 34px;
}

.square:focus {
  outline: none;
}

.move-highlight {
  font-weight: bold;
}

.kbd-navigation .square:focus {
  background: #ddd;
}

.game {
  display: flex;
  flex-direction: row;
}

.game-info {
  margin-left: 20px;
}

            
          
!
            
              // simple functional component: display a value
function Square(props) {
  return (
    <button className="square" onClick={props.onClick}>
      {props.value}
    </button>
  );
}

// Board component: render 9 squares
class Board extends React.Component {
  
  renderSquare(i) {
    return (
      <Square
        value={this.props.squares[i]}
        onClick={() => this.props.onClick(i)}
      />
    );
  }
  
  render() {
    return (
      <div>
        <div className="board-row">
          {this.renderSquare(0)}
          {this.renderSquare(1)}
          {this.renderSquare(2)}
        </div>
        <div className="board-row">
          {this.renderSquare(3)}
          {this.renderSquare(4)}
          {this.renderSquare(5)}
        </div>
        <div className="board-row">
          {this.renderSquare(6)}
          {this.renderSquare(7)}
          {this.renderSquare(8)}
        </div>
      </div>
    );
  }
}

// main Game component: game and click handler logic
class Game extends React.Component {
  
  constructor(props) {
    super(props);
    this.state = {
      history: [{                           // a history of all squares in the game
        squares: Array(9).fill(null),
      }],
      stepNumber: 0,                        // index into history; which step we are viewing
      xIsNext: true,                        // true if X player is next
    };
  }
  
  handleClick(i) {
    const history = this.state.history.slice(0, this.state.stepNumber + 1);
    const current = history[history.length - 1];
    const squares = current.squares.slice(); // clone current squares Array
    
    // test for invalid click
    if (calculateWinner(squares)) {
      console.log("game is already won");
      return;
    }
    if (squares[i]) {
      console.log("square is already taken");
      return;
    }
    // click is valid
    
    // modify new squares Array and concat it to history
    squares[i] = this.state.xIsNext ? 'X' : 'O';
    this.setState({
      history: history.concat([{
        squares: squares,
      }]),
      stepNumber: history.length,
      xIsNext: !this.state.xIsNext, // toggle
    });
  }
  
  jumpTo(step) {
    this.setState({
      stepNumber: step,
      xIsNext: (step % 2) === 0,
    });
  }

  render() {
    const history = this.state.history;
    const current = history[this.state.stepNumber];
    const winner = calculateWinner(current.squares);

    // calculate status
    let status;
    if (winner) {
      status = 'Winner: ' + winner;
    } else {
      status = 'Next Player: ' + (this.state.xIsNext ? 'X' : 'O');
    }
    
    // calculate moves
    const moves = history.map((step, move) => {
      const desc = move ?
        'Go to move #' + move     // move is non-zero
          + ": " + moveAsString(history[move-1].squares,step.squares) :
        'Go to game start';       // move is zero
      const cn = (move === this.state.stepNumber) ? "move-highlight" : "move-no-highlight";
      return (
        <li key={move} className={cn}>
          <button onClick={() => this.jumpTo(move)}>{desc}</button>
        </li>
      );
    });
    
    return (
      <div className="game">
        <div className="game-board">
          <Board
            squares={current.squares}
            onClick={(i) => this.handleClick(i)}
          />
        </div>
        <div className="game-info">
          <div>{status}</div>
          <ol>{moves}</ol>
        </div>
      </div>
    );
  }
}

// return the character of the winner or null if there is none
function calculateWinner(squares) {
  const lines = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6],
  ];
  for (let i = 0; i < lines.length; i++) {
    const [a, b, c] = lines[i];
    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
      return squares[a];
    }
  }
  return null;
}

/**
 * return the new move as a String "(col, row)"
 *
 * @param squares1  first squares state
 * @param squares2  second squares state
 */
function moveAsString(squares1, squares2) {
  // find first non-matching index
  for (let i=0; i < squares1.length && i < squares2.length; i++) {
    if (squares1[i] !== squares2[i]) { 
      const col = (i % 3) + 1;
      const row = Math.floor(i / 3) + 1;
      return `(${col},${row})`;
    }
  }
  return "()";
}

// ========================================

// insert the Game component as a child of 'root'
ReactDOM.render(
  <Game />,
  document.getElementById('root')
);

            
          
!
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