Finished Tutorial, may explore more if I have time

react-fb-tictactoe/src/TicTacToe/index.js

@@ -1,35 +1,49 @@
 import React, { Component } from 'react';
 import './TicTacToe.css'
 
-
 /*
  * Changes from original tutorial
  *  - Here we import Component, so we can replace
  *    class Square extends React.Component
  *    with
  *    class Square extends Component
  */
+
+/*
+// Replaced in section Functional Components
 class Square extends Component {
+
   render() {
     return (
-      <button className="square">
-        {/* TODO */}
+      <button className="square" onClick={() => this.props.onClick()}>
+        {this.props.value}
       </button>
     );
   }
 }
+*/
+
+function Square(props) {
+  return (
+    <button className="square" onClick={props.onClick}>
+      {props.value}
+    </button>
+  );
+}
 
-class Board extends Component {
+class Board extends React.Component {
   renderSquare(i) {
-    return <Square />;
+    return (
+      <Square
+        value={this.props.squares[i]}
+        onClick={() => 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)}
@@ -50,20 +64,104 @@ class Board extends Component {
   }
 }
 
-class Game extends Component {
+class Game extends React.Component {
+  constructor() {
+    super();
+    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 ? "Move #" + move : "Game start";
+      return (
+        <li key={move}>
+          <a href="#" onClick={() => this.jumpTo(move)}>{desc}</a>
+        </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;
+}
+
+
+
 export default Game;