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annotate react_games/src/Connectfour/latest.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 5e6a5d3c6868
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import { CSSProperties, memo, useCallback, useReducer } from "react";
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2
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3 /**
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4 * Connect4 game is also known as Four Up, Plot Four, Find Four, Captain’s Mistress, Four in a Row, Drop Four, and Gravitrips in the Soviet Union.
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5 * It is a two-player connection board game, in which the players choose a color and then take turns dropping colored discs into a seven-column, six-row vertically suspended grid.
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6 * There could be human and bot players.
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7 * The pieces fall straight down, occupying the lowest available space within the column.
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8 * The objective of the game is to be the first to form a horizontal, vertical, or diagonal line of four of one’s own discs. Connect Four is a solved game.
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9 * The first player can always win by playing the right moves.
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10 *
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11 */
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12
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13 interface Cell {
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14 value: CellValue;
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15 isHighlighted: boolean;
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16 }
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17
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18 type CellValue = Player | "";
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19
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20 type Board = Cell[][];
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21
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22 enum Player {
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23 RED="🔴",
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24 BLUE="🔵",
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25 }
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26
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27 enum GameStatus {
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28 PLAYABLE = "Your Turn!",
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29 RED_WON = "RED WON!",
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30 BLUE_WON = "BLUE WON!",
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31 }
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32
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33 interface GameState {
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34 board: Board;
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35 player: Player;
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36 status: GameStatus;
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37 }
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38
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39 const MAX_ROW = 6;
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40 const MAX_COL = 7;
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41
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42 const constructGameState = (): GameState => {
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43 return {
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44 board: Array.from(
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45 { length: MAX_ROW }, () =>
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46 Array.from({ length: MAX_COL }, (): Cell => ({ value: "", isHighlighted: false }) )),
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47 player: Player.RED,
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48 status: GameStatus.PLAYABLE
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49 }
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50 }
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51
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52 interface CellComponentProp {
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53 cell: Cell;
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54 placeDispatch: (col: number) => void;
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55 col: number;
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56 }
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57
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58 interface StylesProp {
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59 board: CSSProperties;
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60 cell: (isHighlighted: boolean) => CSSProperties;
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61 circle: CSSProperties;
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62 }
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63
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64 const styles: StylesProp = {
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65 board: {
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66 display: "grid",
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67 gridTemplateColumns: `repeat(${MAX_COL}, 1fr)`,
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68 width: 600,
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69 },
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70 cell: (isHighlighted: boolean) => ({
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71 width: "100%",
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72 display: "flex",
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73 justifyContent: "center",
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74 alignItems: "center",
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75 aspectRatio: "1 / 1",
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76 border: "1px solid black",
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77 backgroundColor: isHighlighted ? "blue": "lightblue",
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78 }),
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79 circle: {
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80 width: "60%",
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81 borderRadius: 50,
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82 backgroundColor: "aqua",
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83 aspectRatio: "1 / 1",
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84 display: "flex",
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85 justifyContent: "center",
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86 alignItems: "center",
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87 }
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88 }
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89
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90 type Action =
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91 | { type: "place", col: number }
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92 | { type: "reset" };
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93
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94
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95 const DIRECTION = [
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96 [0, 1],
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97 [1, 0],
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98 [1, 1],
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99 [1, -1],
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100 ]
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101 const calculateGameStatus = (board: Board): { status: GameStatus, winningIndex: number[][] } => {
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102 for (let rowIdx = 0; rowIdx < MAX_ROW; rowIdx++) {
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103 for (let colIdx = 0; colIdx < MAX_COL; colIdx++) {
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104 if (board[rowIdx][colIdx].value === "") continue;
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105
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106 for (const [dr, dc] of DIRECTION) {
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107 if (
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108 board[rowIdx][colIdx].value === board[rowIdx+dr]?.[colIdx+dc]?.value &&
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109 board[rowIdx][colIdx].value === board[rowIdx+(dr*2)]?.[colIdx+(dc*2)]?.value &&
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110 board[rowIdx][colIdx].value === board[rowIdx+(dr*3)]?.[colIdx+(dc*3)]?.value
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111 ) {
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112 return {
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113 status: board[rowIdx][colIdx].value === Player.RED ? GameStatus.RED_WON : GameStatus.BLUE_WON,
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114 winningIndex: [
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115 [rowIdx,colIdx],
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116 [rowIdx+dr,colIdx+dc],
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117 [rowIdx+(dr*2),colIdx+(dc*2)],
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118 [rowIdx+(dr*3),colIdx+(dc*3)],
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119 ]
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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 {
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127 status: GameStatus.PLAYABLE,
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128 winningIndex: []
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129 }
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130 }
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131
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132 const gameStateReducer = (state: GameState, action: Action): GameState => {
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133 if (state.status !== GameStatus.PLAYABLE) return state;
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134
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135 switch(action.type) {
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136 case "place": {
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137 let selectedRow: number = -1
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138 for (let rowIdx = MAX_ROW - 1; rowIdx >= 0; rowIdx--) {
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139 if (state.board[rowIdx][action.col].value === "") {
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140 selectedRow = rowIdx;
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141 break;
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142 }
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143 }
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144 if (selectedRow === -1) return state;
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145 let board = state.board.map(
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146 (row, rowIdx) => rowIdx === selectedRow ?
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147 row.map((col, colIdx) =>
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148 colIdx === action.col ? { ...col, value: state.player } : col) : row
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149 );
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150 const player = Player.RED === state.player ? Player.BLUE : Player.RED;
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151 const {status, winningIndex} = calculateGameStatus(board);
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152 if (winningIndex.length > 0) {
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153 board = board.map(
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154 (row, rowIdx) =>
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155 row.map((col, colIdx): Cell =>
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156 winningIndex.some(
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157 ([r, c]) => (rowIdx === r && colIdx === c)) ?
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158 { ...col, isHighlighted: true } : col
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159 )
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160 );
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161 }
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162 return {
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163 board,
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164 player,
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165 status,
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166 };
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167 }
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168 case "reset":
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169 return constructGameState();
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170 }
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171 }
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172
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173 const CellComponent = memo(({cell, col, placeDispatch}: CellComponentProp) => {
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174 const handleOnClick = useCallback(() => {
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175 placeDispatch(col);
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176 },[col, placeDispatch]);
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177
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178 return (
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179 <div style={styles.cell(cell.isHighlighted)} onClick={handleOnClick}>
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180 <div style={styles.circle}>
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181 {cell.value}
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182 </div>
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183 </div>
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184 )
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185 })
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186
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187 const ConnectFour = () => {
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188 const [state, dispatch] = useReducer(gameStateReducer, null, constructGameState);
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189
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190 const placeDispatch = useCallback(
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191 (col: number) => {
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192 dispatch({type: "place", col})
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193 }, [dispatch]);
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194
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195 return (
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196 <>
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197 <h1> {state.status} </h1>
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198 {state.status === GameStatus.PLAYABLE &&(<h2> {state.player} </h2>)}
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199 <div style={styles.board}>
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200 {state.board.map(
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201 (row, rowIdx) => row.map(
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202 (cell, colIdx) => (
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203 <CellComponent
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204 key={`${rowIdx}-${colIdx}`}
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205 cell={cell}
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206 col={colIdx}
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207 placeDispatch={placeDispatch}/>
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208 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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parents:
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209 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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210 )}
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211 </div>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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212 </>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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213 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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parents:
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214 }
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215
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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216 export {
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MrJuneJune <me@mrjunejune.com>
parents:
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217 ConnectFour
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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parents:
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218 }