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annotate react_games/src/Robot/main.tsx @ 123:3f4ec30e42e0

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Added blog files.
author June Park <parkjune1995@gmail.com>
date Thu, 08 Jan 2026 06:46:10 -0800
parents fb9bcd3145cb
children
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fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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1 /**
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2 * Scenario
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3 * Design a miniature browser game in which a single “robot” sprite navigates a
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4 * rectangular grid to reach a goal while avoiding obstacles. Everything—from bootstrapping the project
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5 * to shipping a playable, restartable game—must be accomplished within one hour.
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6 *
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7 *
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8 * Grid 10 x 10
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9 * Robot top left corner
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10 * Obstical is going to be 10
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11 *
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12 * one of the grid is going to be the goal
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13 *
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14 * Movement logic keyboard or WASD okay
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15 */
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16
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17 import React, { CSSProperties, memo, useEffect, useReducer } from "react";
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18
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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19 enum CellValue {
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20 PLAYER,
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21 GOAL,
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22 OBSTICAL,
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23 EMPTY
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24 }
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25
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26 interface Cell {
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27 value: CellValue;
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28 }
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29
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30 interface RowProp {
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31 rowValue: Cell[];
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32 }
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33
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34 interface CellComponentProp {
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35 cell: Cell;
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36 }
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37
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38 enum GameStatus {
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39 PLAYABLE,
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40 WON,
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41 }
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42
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43 interface RobotState {
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44 x: number;
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45 y: number,
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46 }
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47
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48 interface GameState {
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49 board: Cell[][];
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50 status: GameStatus;
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51 robotState: RobotState;
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52 }
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53
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54 enum GameActionType {
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55 MOVE,
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56 RESET,
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57 }
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58
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59 type GameAction = {type: GameActionType.MOVE, command: string } | { type: GameActionType.RESET }
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60
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61 const MAX_WIDTH: number = 10;
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62 const MAX_COLUMN: number = 10;
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63 const BOARD: Cell[][] = Array.from(
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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64 { length: MAX_WIDTH },
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65 () => Array(MAX_COLUMN).fill({value: CellValue.EMPTY})
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66 );
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67
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68 BOARD[0][0] = {
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69 value: CellValue.PLAYER
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70 }
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71 BOARD[0][5] = {
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72 value: CellValue.OBSTICAL
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73 }
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74 BOARD[6][5] = {
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75 value: CellValue.GOAL
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76 }
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77
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78
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79 const getCellValue = (cell: Cell) => {
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80 switch(cell.value) {
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81 case CellValue.EMPTY:
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82 return (
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83 <></>
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84 )
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85 case CellValue.PLAYER:
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86 return (
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87 <>🤖</>
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88 )
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89 case CellValue.OBSTICAL:
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90 return (
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91 <>🧱</>
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92 )
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93 case CellValue.GOAL:
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94 return (
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95 <>🪙</>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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96 )
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97 }
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98 }
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99
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100 const CellComponent = memo(({cell}: CellComponentProp) => {
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101 const cellStyle: CSSProperties = {
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102 padding: "10px",
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103 width: "50px",
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104 height: "50px",
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105 border: "1px solid #ccc",
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106 }
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107 return (
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108 <div style={cellStyle}>
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109 {getCellValue(cell)}
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110 </div>
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111 )
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112 })
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113
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114 const Row = memo(({rowValue}: RowProp) => {
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115 const rowStyle: CSSProperties = {
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116 display: "flex",
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117 }
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118 return (
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119 <div style={rowStyle}>
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120 {rowValue.map((cell, idx) => {return <CellComponent key={idx} cell={cell} />})}
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121 </div>
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122 )
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123 })
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124
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125 function boardReducer(state: GameState, action: GameAction): GameState {
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126 if (action.type === GameActionType.RESET) return INITIAL_GAME_STATE;
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127
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128 const { x, y } = state.robotState;
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129 let newX = x;
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130 let newY = y;
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131
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132 switch (action.command) {
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133 case "W": newX = Math.max(0, x - 1); break;
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134 case "A": newY = Math.max(0, y - 1); break;
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MrJuneJune <me@mrjunejune.com>
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135 case "S": newX = Math.min(MAX_WIDTH - 1, x + 1); break;
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MrJuneJune <me@mrjunejune.com>
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136 case "D": newY = Math.min(MAX_COLUMN - 1, y + 1); break;
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MrJuneJune <me@mrjunejune.com>
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137 default: return state;
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MrJuneJune <me@mrjunejune.com>
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138 }
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MrJuneJune <me@mrjunejune.com>
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139
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MrJuneJune <me@mrjunejune.com>
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140 const newBoard = state.board.map(row => row.slice());
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141
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MrJuneJune <me@mrjunejune.com>
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142 newBoard[x][y] = { value: CellValue.EMPTY }; // old spot
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143 newBoard[newX][newY] = { value: CellValue.PLAYER }; // new spot
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MrJuneJune <me@mrjunejune.com>
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144
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MrJuneJune <me@mrjunejune.com>
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145 return {
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MrJuneJune <me@mrjunejune.com>
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146 board: newBoard,
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MrJuneJune <me@mrjunejune.com>
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147 status: GameStatus.PLAYABLE,
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MrJuneJune <me@mrjunejune.com>
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148 robotState: { x: newX, y: newY },
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MrJuneJune <me@mrjunejune.com>
parents:
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149 };
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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150 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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151
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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152 const INITIAL_GAME_STATE: GameState = {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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153 board: BOARD,
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MrJuneJune <me@mrjunejune.com>
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154 status: GameStatus.PLAYABLE,
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MrJuneJune <me@mrjunejune.com>
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155 robotState: { x: 0, y: 0 },
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MrJuneJune <me@mrjunejune.com>
parents:
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156 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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157
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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158 const Current = () => {
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MrJuneJune <me@mrjunejune.com>
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159 const [state, dispatch] = useReducer(boardReducer, INITIAL_GAME_STATE);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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160
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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161 useEffect(() => {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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162 const handleKeyDown = (event: KeyboardEvent) => {
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MrJuneJune <me@mrjunejune.com>
parents:
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163 dispatch({type: GameActionType.MOVE, command: event.key.toUpperCase()})
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MrJuneJune <me@mrjunejune.com>
parents:
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164 };
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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165
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
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166 document.addEventListener("keydown", handleKeyDown);
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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167 }, [])
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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168
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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169
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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170
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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171 return (
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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172 <>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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173 {state.board.map((row, idx) => { return <Row key={idx} rowValue={row} />})}
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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174 </>
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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175 );
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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176 }
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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177
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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178 export {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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179 Current
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
MrJuneJune <me@mrjunejune.com>
parents:
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180 }