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[ReactGames] Few games I made using react just to practice few things.
author MrJuneJune <me@mrjunejune.com>
date Mon, 01 Dec 2025 20:22:47 -0800
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children 5e6a5d3c6868
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fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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1 import { CSSProperties, memo, useCallback, useReducer } from "react";
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2 import ReactDOM from "react-dom/client";
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3
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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4 /**
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5 * 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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6 * 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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7 * There could be human and bot players.
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8 * The pieces fall straight down, occupying the lowest available space within the column.
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9 * 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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10 * The first player can always win by playing the right moves.
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11 *
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12 */
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13
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14 interface Cell {
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15 value: CellValue;
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16 isHighlighted: boolean;
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17 }
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18
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19 type CellValue = Player | "";
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20
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21 type Board = Cell[][];
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22
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23 enum Player {
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24 RED="🔴",
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25 BLUE="🔵",
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26 }
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27
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28 enum GameStatus {
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29 PLAYABLE = "Your Turn!",
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30 RED_WON = "RED WON!",
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31 BLUE_WON = "BLUE WON!",
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32 }
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33
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34 interface GameState {
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35 board: Board;
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36 player: Player;
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37 status: GameStatus;
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38 }
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39
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40 const MAX_ROW = 6;
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41 const MAX_COL = 7;
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42
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43 const constructGameState = (): GameState => {
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44 return {
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45 board: Array.from(
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46 { length: MAX_ROW }, () =>
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47 Array.from({ length: MAX_COL }, (): Cell => ({ value: "", isHighlighted: false }) )),
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48 player: Player.RED,
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49 status: GameStatus.PLAYABLE
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50 }
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51 }
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52
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53 interface CellComponentProp {
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54 cell: Cell;
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55 placeDispatch: (col: number) => void;
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56 col: number;
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57 }
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58
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59 interface StylesProp {
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60 board: CSSProperties;
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61 cell: (isHighlighted: boolean) => CSSProperties;
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62 circle: CSSProperties;
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63 }
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64
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65 const styles: StylesProp = {
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66 board: {
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67 display: "grid",
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68 gridTemplateColumns: `repeat(${MAX_COL}, 1fr)`,
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69 width: 600,
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70 },
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71 cell: (isHighlighted: boolean) => ({
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72 width: "100%",
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73 display: "flex",
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74 justifyContent: "center",
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75 alignItems: "center",
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76 aspectRatio: "1 / 1",
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77 border: "1px solid black",
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78 backgroundColor: isHighlighted ? "blue": "lightblue",
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79 }),
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80 circle: {
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81 width: "60%",
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82 borderRadius: 50,
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83 backgroundColor: "aqua",
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84 aspectRatio: "1 / 1",
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85 display: "flex",
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86 justifyContent: "center",
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87 alignItems: "center",
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88 }
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89 }
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90
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91 type Action =
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92 | { type: "place", col: number }
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93 | { type: "reset" };
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94
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95
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96 const DIRECTION = [
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97 [0, 1],
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98 [1, 0],
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99 [1, 1],
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100 [1, -1],
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101 ]
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102 const calculateGameStatus = (board: Board): { status: GameStatus, winningIndex: number[][] } => {
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103 for (let rowIdx = 0; rowIdx < MAX_ROW; rowIdx++) {
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104 for (let colIdx = 0; colIdx < MAX_COL; colIdx++) {
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105 if (board[rowIdx][colIdx].value === "") continue;
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106
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107 for (const [dr, dc] of DIRECTION) {
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108 if (
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109 board[rowIdx][colIdx].value === board[rowIdx+dr]?.[colIdx+dc]?.value &&
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110 board[rowIdx][colIdx].value === board[rowIdx+(dr*2)]?.[colIdx+(dc*2)]?.value &&
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111 board[rowIdx][colIdx].value === board[rowIdx+(dr*3)]?.[colIdx+(dc*3)]?.value
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112 ) {
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113 return {
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114 status: board[rowIdx][colIdx].value === Player.RED ? GameStatus.RED_WON : GameStatus.BLUE_WON,
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115 winningIndex: [
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116 [rowIdx,colIdx],
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117 [rowIdx+dr,colIdx+dc],
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118 [rowIdx+(dr*2),colIdx+(dc*2)],
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119 [rowIdx+(dr*3),colIdx+(dc*3)],
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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
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127 return {
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128 status: GameStatus.PLAYABLE,
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129 winningIndex: []
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130 }
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131 }
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132
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133 const gameStateReducer = (state: GameState, action: Action): GameState => {
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134 if (state.status !== GameStatus.PLAYABLE) return state;
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135
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136 switch(action.type) {
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137 case "place": {
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138 let selectedRow: number = -1
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139 for (let rowIdx = MAX_ROW - 1; rowIdx >= 0; rowIdx--) {
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140 if (state.board[rowIdx][action.col].value === "") {
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141 selectedRow = rowIdx;
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142 break;
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143 }
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144 }
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145 if (selectedRow === -1) return state;
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146 let board = state.board.map(
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147 (row, rowIdx) => rowIdx === selectedRow ?
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148 row.map((col, colIdx) =>
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149 colIdx === action.col ? { ...col, value: state.player } : col) : row
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150 );
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151 const player = Player.RED === state.player ? Player.BLUE : Player.RED;
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152 const {status, winningIndex} = calculateGameStatus(board);
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153 if (winningIndex.length > 0) {
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154 board = board.map(
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155 (row, rowIdx) =>
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156 row.map((col, colIdx): Cell =>
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157 winningIndex.some(
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158 ([r, c]) => (rowIdx === r && colIdx === c)) ?
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159 { ...col, isHighlighted: true } : col
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160 )
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161 );
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162 }
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163 return {
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164 board,
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165 player,
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166 status,
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167 };
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168 }
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169 case "reset":
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170 return constructGameState();
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171 }
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172 }
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173
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174 const CellComponent = memo(({cell, col, placeDispatch}: CellComponentProp) => {
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175 const handleOnClick = useCallback(() => {
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176 placeDispatch(col);
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177 },[col, placeDispatch]);
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178
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179 return (
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180 <div style={styles.cell(cell.isHighlighted)} onClick={handleOnClick}>
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181 <div style={styles.circle}>
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182 {cell.value}
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183 </div>
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184 </div>
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185 )
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186 })
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187
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188 const ConnectFour = () => {
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189 const [state, dispatch] = useReducer(gameStateReducer, null, constructGameState);
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190
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191 const placeDispatch = useCallback(
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192 (col: number) => {
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193 dispatch({type: "place", col})
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194 }, [dispatch]);
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195
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196 return (
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197 <>
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198 <h1> {state.status} </h1>
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199 {state.status === GameStatus.PLAYABLE &&(<h2> {state.player} </h2>)}
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200 <div style={styles.board}>
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201 {state.board.map(
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202 (row, rowIdx) => row.map(
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203 (cell, colIdx) => (
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204 <CellComponent
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205 key={`${rowIdx}-${colIdx}`}
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206 cell={cell}
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207 col={colIdx}
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208 placeDispatch={placeDispatch}/>
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209 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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210 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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211 )}
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212 </div>
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213 </>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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214 )
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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215 }
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216
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217 export {
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218 ConnectFour
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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219 }