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annotate react_games/src/Tictactoe/main.tsx @ 104:2301aeb7503b

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author June Park <parkjune1995@gmail.com>
date Sat, 03 Jan 2026 10:20:45 -0800
parents fb9bcd3145cb
children
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1 import { CSSProperties, memo, useCallback, useReducer } from 'react';
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2
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3 enum GameStatus {
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4 PLAYABLE,
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5 WON,
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6 TIE,
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7 }
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8
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9 enum Player {
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10 O = "O",
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11 X = "X",
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12 }
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13
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14 type CellValue = Player | "";
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15
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16 interface Cell {
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17 value: CellValue;
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18 isWonSquare: boolean;
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19 }
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20
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21 type Board = Cell[][]
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22
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23 interface GameState {
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24 board: Board;
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25 status: GameStatus;
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26 player: Player;
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27 winner?: Player | null;
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28 }
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29
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30 const MAX_ROW = 3;
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31 const MAX_COL = 3;
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32
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33 const getInitialGameState = (): GameState => {
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34 return {
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35 board: Array.from({ length: MAX_ROW },
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36 () => Array(MAX_COL).fill(
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37 {
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38 value: "",
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39 isWonSquare: false,
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40 }) as Cell[],
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41 ),
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42 status: GameStatus.PLAYABLE,
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43 player: Player.X,
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44 }
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45 };
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46
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47 interface CellComponentProp {
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48 cell: Cell;
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49 row: number;
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50 col: number;
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51 moveDispatch: (r: number, c: number) => void;
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52 }
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53
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54 const cellCssStyle = (isWinningSquare: boolean): CSSProperties => ({
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55 display: "flex",
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56 justifyContent: "center",
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57 alignItems: "center",
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58 width: "100%",
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59 aspectRatio: "1 / 1",
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60 background: isWinningSquare ? "blue" : "lightblue",
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61 border: "1px solid black"
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62 })
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63
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64 const CellComponent = memo(({ cell, row, col, moveDispatch }: CellComponentProp) => {
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65 const handleOnClick = useCallback(() => {
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66 moveDispatch(row, col);
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67 }, [row,col])
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68 return (
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69 <div style={cellCssStyle(cell.isWonSquare)} onClick={handleOnClick}>
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70 {cell.value}
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71 </div>
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72 )
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73 })
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74
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75 const boardCssStyle: CSSProperties = {
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76 display: "grid",
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77 gridTemplateColumns: `repeat(${MAX_COL}, 1fr)`,
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78 width: 500,
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79 }
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80
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81 enum ActionType {
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82 PLACE,
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83 RESET,
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84 };
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85
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86 type Action =
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87 | { type: ActionType.PLACE, row: number, col: number }
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88 | { type: ActionType.RESET };
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89
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90
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91 type GameStatusAndPosition =
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92 | { newStatus: GameStatus.WON, winningPositions: number[][]}
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93 | { newStatus: GameStatus.TIE }
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94 | { newStatus: GameStatus.PLAYABLE }
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95
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96
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97 const getGameStatus = (board: Board): GameStatusAndPosition => {
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98 const direction = [
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99 [0, 1],
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100 [1, 0],
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101 [1, 1],
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102 [1, -1],
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103 ];
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104 let numberOfFilledValue = 0;
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105 for (let row=0; row<MAX_ROW; row++) {
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106 for (let col=0; col<MAX_COL; col++) {
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107 if (board[row][col].value === "") continue;
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108 numberOfFilledValue++;
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109 for (const [dr, dc] of direction) {
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110 if (
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111 board[row][col].value === board[row+dr]?.[col+dc]?.value &&
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112 board[row][col].value === board[row+(dr*2)]?.[col+(dc*2)]?.value
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113 ) {
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114 return {
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115 newStatus: GameStatus.WON,
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116 winningPositions: [
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117 [row, col],
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118 [row+dr, col+dc],
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119 [row+dr+dr, col+dc+dc],
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120 ]
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121 }
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122 }
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123 }
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124 }
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125 }
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126 return numberOfFilledValue === MAX_ROW * MAX_COL
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127 ? { newStatus: GameStatus.TIE }
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128 : { newStatus: GameStatus.PLAYABLE };
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129 }
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130
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131 const gameStateReducer = (state: GameState, action: Action): GameState => {
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132 if (state.status === GameStatus.WON) return state;
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133
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134 switch(action.type) {
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135 case ActionType.PLACE:
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136 if (state.board[action.row][action.col].value) return state;
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137
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138 let newBoard: Board = state.board.map(
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139 (row, rowIdx) =>
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140 rowIdx === action.row
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141 ? row.map((col, c) =>
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142 c === action.col ? {...col, value: state.player} : col
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143 )
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144 : row
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145 );
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146 const res = getGameStatus(newBoard);
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147 let winner: Player | null = null;
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148 if (res.newStatus === GameStatus.WON) {
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149 winner = state.player;
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150 newBoard = newBoard.map((row, rowIdx) =>
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151 row.map((col, colIdx) =>
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152 res.winningPositions.some(([wr, wc]) => wr === rowIdx && wc === colIdx)
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153 ? { ...col, isWonSquare: true }
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154 : col
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155 )
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156 )
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157 }
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158 return {
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159 ...state,
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160 board: newBoard,
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161 status: res.newStatus,
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162 player: Player.X === state.player ? Player.O : Player.X,
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163 winner,
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164 };
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165 case ActionType.RESET:
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166 return getInitialGameState();
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167 }
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168 }
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169
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170 const TicTacToe = () => {
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171 const [state, dispatch] = useReducer( gameStateReducer, null, getInitialGameState);
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172 const moveDispatch = useCallback(
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173 (rowIdx: number, colIdx: number) => dispatch({type: ActionType.PLACE, row: rowIdx, col: colIdx}), [])
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174 return (
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175 <>
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176 <h1> TicTacToe </h1>
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177 <h2>
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178 {
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179 state.status === GameStatus.PLAYABLE
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180 ? `Player ${state.player} Turn!`
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181 : state.status === GameStatus.TIE
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182 ? "Game is tied! Please reset"
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183 : `Player ${state.winner} has won!`
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184 }
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185 </h2>
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186 <div style={boardCssStyle}>
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187 {
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188 state.board.map((row, rowIdx) => {
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189 return row.map((cell, colIdx) => {
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190 const cellComponentProp: CellComponentProp = {
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191 cell,
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192 row: rowIdx,
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193 col: colIdx,
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194 moveDispatch,
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195 };
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196
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197 return (
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198 <CellComponent
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199 key={`${rowIdx}-${colIdx}`}
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200 {...cellComponentProp}
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201 />)
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202 })
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203 })
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204 }
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205 </div>
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206 <button onClick={() => dispatch({ type: ActionType.RESET })}>Reset</button>
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207 </>
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208 );
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209 }
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210
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211 export {
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212 TicTacToe,
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213 }
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parents:
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214