chore: add pages/tictactoe.js to test reactDOM

website/pages/index.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import TicTacToe from './tictactoe';
 import {Link} from 'react-router-dom';
 
 export default class Home extends React.Component {
@@ -11,7 +12,10 @@ export default class Home extends React.Component {
     ));
     return (
       <div>
-        <ul>Available Routes{routeLinks}</ul>
+        <h2> Available Urls </h2>
+        <ul>{routeLinks}</ul>
+        <h2> Play some TicTacToe </h2>
+        <TicTacToe />
       </div>
     );
   }

website/pages/tictactoe.js

@@ -0,0 +1,165 @@
+import React from 'react';
+
+const square = {
+  background: '#fff',
+  border: '1px solid #999',
+  float: 'left',
+  fontSize: '24px',
+  fontWeight: 'bold',
+  lineHeight: '34px',
+  height: '34px',
+  marginright: '-1px',
+  marginTop: '-1px',
+  padding: '0',
+  textAlign: 'center',
+  width: '34px'
+};
+
+const boardRow = {
+  clear: 'both',
+  content: '',
+  display: 'table'
+};
+
+const game = {
+  display: 'flex',
+  flexDirection: 'row'
+};
+
+function Square(props) {
+  return (
+    <button style={square} onClick={props.onClick}>
+      {props.value}
+    </button>
+  );
+}
+
+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;
+}
+
+class Board extends React.Component {
+  renderSquare(i) {
+    return (
+      <Square
+        value={this.props.squares[i]}
+        onClick={() => this.props.onClick(i)}
+      />
+    );
+  }
+
+  render() {
+    return (
+      <div>
+        <div style={boardRow}>
+          {this.renderSquare(0)}
+          {this.renderSquare(1)}
+          {this.renderSquare(2)}
+        </div>
+        <div style={boardRow}>
+          {this.renderSquare(3)}
+          {this.renderSquare(4)}
+          {this.renderSquare(5)}
+        </div>
+        <div style={boardRow}>
+          {this.renderSquare(6)}
+          {this.renderSquare(7)}
+          {this.renderSquare(8)}
+        </div>
+      </div>
+    );
+  }
+}
+
+class Game extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      history: [
+        {
+          squares: Array(9).fill(null)
+        }
+      ],
+      stepNumber: 0,
+      xIsNext: true
+    };
+  }
+
+  handleClick(i) {
+    const history = this.state.history.slice(0, this.state.stepNumber + 1);
+    const current = history[history.length - 1];
+    const squares = current.squares.slice();
+    if (calculateWinner(squares) || squares[i]) {
+      return;
+    }
+    squares[i] = this.state.xIsNext ? 'X' : 'O';
+    this.setState({
+      history: history.concat([
+        {
+          squares: squares
+        }
+      ]),
+      stepNumber: history.length,
+      xIsNext: !this.state.xIsNext
+    });
+  }
+
+  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);
+
+    const moves = history.map((step, move) => {
+      const desc = move ? 'Go to move #' + move : 'Go to game start';
+      return (
+        <li key={move}>
+          <button onClick={() => this.jumpTo(move)}>{desc}</button>
+        </li>
+      );
+    });
+
+    let status;
+    if (winner) {
+      status = 'Winner: ' + winner;
+    } else {
+      status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
+    }
+
+    return (
+      <div style={game}>
+        <div>
+          <Board squares={current.squares} onClick={i => this.handleClick(i)} />
+        </div>
+        <div style={{marginLeft: '10px'}}>
+          <div>{status}</div>
+          <ol>{moves}</ol>
+        </div>
+      </div>
+    );
+  }
+}
+
+export default Game;