Training0

.node-version

@@ -1 +1 @@
-nodejs 16.13.0
+16.13.0

tic-tac-toe-app/package.json

@@ -39,5 +39,8 @@
       "last 1 firefox version",
       "last 1 safari version"
     ]
+  },
+  "devDependencies": {
+    "prettier": "2.5.0"
   }
 }

tic-tac-toe-app/src/index.tsx

@@ -1,29 +1,38 @@
-import React from 'react';
-import ReactDOM from 'react-dom';
-import './index.css';
-import reportWebVitals from './reportWebVitals';
+import React from "react";
+import ReactDOM from "react-dom";
+import "./index.css";
+import reportWebVitals from "./reportWebVitals";
 
-class Square extends React.Component {
-  render() {
-    return (
-      <button className="square">
-        {/* TODO */}
-      </button>
-    );
-  }
+type SquareValue = string | null;
+type SquareProps = {
+  value: SquareValue;
+  onClick: () => void;
+};
+function Square(props: SquareProps) {
+  return (
+    <button className="square" onClick={props.onClick}>
+      {props.value}
+    </button>
+  );
 }
 
-class Board extends React.Component {
-  renderSquare(_: number) {
-    return <Square />;
+type BoardProps = {
+  squares: SquareValue[];
+  onClick: (i: number) => void;
+};
+class Board extends React.Component<BoardProps> {
+  renderSquare(i: number) {
+    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)}
@@ -43,30 +52,110 @@ class Board extends React.Component {
     );
   }
 }
-
-class Game extends React.Component {
+type GameHistory = {
+  squares: SquareValue[];
+};
+type GameProps = {};
+type GameState = {
+  history: GameHistory[];
+  stepNumber: number;
+  xIsNext: boolean;
+};
+class Game extends React.Component<GameProps, GameState> {
+  constructor(props: GameProps) {
+    super(props);
+    this.state = {
+      history: [
+        {
+          squares: Array(9).fill(null),
+        },
+      ],
+      stepNumber: 0,
+      xIsNext: true,
+    };
+  }
+  handleClick(i: number) {
+    const history = this.state.history.slice(0, this.state.stepNumber + 1);
+    const current = history[this.state.stepNumber];
+    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: number) {
+    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);
+    let status;
+    if (winner) {
+      status = "Winner: " + winner;
+    } else {
+      status = "Next player: " + (this.state.xIsNext ? "X" : "O");
+    }
+    const moves = history.map((_, move) => {
+      const desc = move ? "Go to move #" + move : "Go to game start";
+      return (
+        <li key={move}>
+          <button onClick={() => this.jumpTo(move)}>{desc}</button>
+        </li>
+      );
+    });
     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: Array<SquareValue>) {
+  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(
-  <Game />,
-  document.getElementById('root')
-);
+// ========================================
 
+ReactDOM.render(<Game />, document.getElementById("root"));
 
 // If you want to start measuring performance in your app, pass a function
 // to log results (for example: reportWebVitals(console.log))