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annotate react_games/src/Tictactoe/example.tsx @ 116:7bd795bac997

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[Postdog] Added scrollable area to inputs and history files, buttons to delete and view.
author June Park <parkjune1995@gmail.com>
date Wed, 07 Jan 2026 04:52:17 -0800
parents fb9bcd3145cb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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1 import { useState } from 'react';
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2
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3 function Square({ value, onSquareClick }) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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4 return (
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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5 <button className="square" onClick={onSquareClick}>
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6 {value}
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7 </button>
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8 );
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9 }
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10
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11 function Board({ xIsNext, squares, onPlay }) {
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12 function handleClick(i) {
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13 if (calculateWinner(squares) || squares[i]) {
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14 return;
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15 }
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16 const nextSquares = squares.slice();
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17 if (xIsNext) {
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18 nextSquares[i] = 'X';
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19 } else {
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20 nextSquares[i] = 'O';
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21 }
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22 onPlay(nextSquares);
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23 }
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24
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25 const winner = calculateWinner(squares);
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26 let status;
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27 if (winner) {
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28 status = 'Winner: ' + winner;
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29 } else {
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30 status = 'Next player: ' + (xIsNext ? 'X' : 'O');
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31 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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32
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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33 return (
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34 <>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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35 <div className="status">{status}</div>
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36 <div className="board-row">
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37 <Square value={squares[0]} onSquareClick={() => handleClick(0)} />
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38 <Square value={squares[1]} onSquareClick={() => handleClick(1)} />
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39 <Square value={squares[2]} onSquareClick={() => handleClick(2)} />
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40 </div>
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41 <div className="board-row">
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42 <Square value={squares[3]} onSquareClick={() => handleClick(3)} />
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43 <Square value={squares[4]} onSquareClick={() => handleClick(4)} />
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44 <Square value={squares[5]} onSquareClick={() => handleClick(5)} />
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45 </div>
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46 <div className="board-row">
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47 <Square value={squares[6]} onSquareClick={() => handleClick(6)} />
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48 <Square value={squares[7]} onSquareClick={() => handleClick(7)} />
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49 <Square value={squares[8]} onSquareClick={() => handleClick(8)} />
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50 </div>
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51 </>
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52 );
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53 }
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54
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55 export default function Game() {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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56 const [history, setHistory] = useState([Array(9).fill(null)]);
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57 const [currentMove, setCurrentMove] = useState(0);
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58 const xIsNext = currentMove % 2 === 0;
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59 const currentSquares = history[currentMove];
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60
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61 function handlePlay(nextSquares) {
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62 const nextHistory = [...history.slice(0, currentMove + 1), nextSquares];
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63 setHistory(nextHistory);
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64 setCurrentMove(nextHistory.length - 1);
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65 }
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66
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67 function jumpTo(nextMove) {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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68 setCurrentMove(nextMove);
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69 }
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70
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71 const moves = history.map((squares, move) => {
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72 let description;
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73 if (move > 0) {
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74 description = 'Go to move #' + move;
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75 } else {
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76 description = 'Go to game start';
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77 }
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78 return (
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79 <li key={move}>
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80 <button onClick={() => jumpTo(move)}>{description}</button>
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81 </li>
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82 );
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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83 });
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84
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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85 return (
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86 <div className="game">
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87 <div className="game-board">
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88 <Board xIsNext={xIsNext} squares={currentSquares} onPlay={handlePlay} />
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89 </div>
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90 <div className="game-info">
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91 <ol>{moves}</ol>
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92 </div>
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93 </div>
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94 );
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95 }
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96
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97 function calculateWinner(squares) {
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98 const lines = [
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99 [0, 1, 2],
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100 [3, 4, 5],
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101 [6, 7, 8],
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102 [0, 3, 6],
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103 [1, 4, 7],
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104 [2, 5, 8],
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105 [0, 4, 8],
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106 [2, 4, 6],
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107 ];
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108 for (let i = 0; i < lines.length; i++) {
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109 const [a, b, c] = lines[i];
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110 if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
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111 return squares[a];
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112 }
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113 }
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114 return null;
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115 }