Finished React tutorial

week_7/examples/tictactoe.js

-class Square extends React.Component {
-  render() {
+function Square(props) {
     return (
-      <button className="square">
-        {/* TODO */}
+      <button
+        className="square"
+        onClick={props.handlerFunction}
+      >
+        {props.value}
       </button>
     );
-  }
 }
 
 class Board extends React.Component {
+
   renderSquare(i) {
-    return <Square />;
+    return (<Square
+        value={this.props.squares[i]}
+        handlerFunction={() => this.props.onClick(i)}
+    />);
   }
 
   render() {
-    const status = 'Next player: X';
+
 
     return (
       <div>
-        <div className="status">{status}</div>
         <div className="board-row">
           {this.renderSquare(0)}
           {this.renderSquare(1)}
@@ -40,21 +44,110 @@ class Board extends React.Component {
 }
 
 class Game extends React.Component {
+  constructor(props) {
+      super(props);
+      this.state = {
+          history: [{
+              squares: Array(9).fill(null),
+          }],
+          xIsNext: true,
+          stepNumber: 0,
+      }
+  }
+
+  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, moveNumber) => {
+        let desc;
+        if (moveNumber == 0) {
+            desc = 'Go to game start';
+        } else {
+            desc = 'Go to move#' + moveNumber;
+        }
+
+        return (
+          <li key={moveNumber}>
+              <button onClick={()=> this.jumpTo(moveNumber)}>{desc}</button>
+          </li>
+        );
+    });
+
+
+    let status;
+    if(winner) {
+        status = 'Winner: ' + winner;
+    } else {
+        status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
+    }
+
     return (
       <div className="game">
         <div className="game-board">
-          <Board />
+          <Board
+            squares={current.squares}
+            onClick={(i) => this.handleClick(i)}
+          />
         </div>
         <div className="game-info">
-          <div>{/* status */}</div>
-          <ol>{/* TODO */}</ol>
+          <div>{status}</div>
+          <ol>{moves}</ol>
         </div>
       </div>
     );
   }
 }
 
+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;
+};
+
 // ========================================
 
 ReactDOM.render(