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[MrJuneJune] Simple animations for darkmode.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 21:38:23 -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 *
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3 * You’re tasked with building a simple memory card-matching game in React.
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4
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5 Each card has a hidden value, and the player flips two cards at a time to try to find a match.
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6
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7 If the cards match, they stay face-up. If not, they flip back after a short delay.
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8
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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9 The game ends when all pairs are matched.
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10
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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11 // Basic components
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12 // Board
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13 // Cards (values 1 to 10)
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14 // There will be 20 cards, 4 x 5.
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15 //
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16 // GameState: playable or not
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17 // logic check if the value sames
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18 //
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19 // listOfCurrentlyTurnOpend: len(2) number[]
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20 */
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21 import React, {
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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22 createContext,
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23 useContext,
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24 useEffect,
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25 useReducer,
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26 } from "react";
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27
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28 /* ──────────────────── Types ──────────────────── */
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29 interface CardValue {
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30 value: number;
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31 isFacing: boolean;
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32 isSolved: boolean;
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33 }
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34
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35 interface CardProp {
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36 row: number;
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37 col: number;
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38 card: CardValue;
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39 }
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40
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41 interface RowProp {
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42 rowPos: number;
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43 row: CardValue[];
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44 }
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45
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46 type Action =
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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47 | { type: "move"; row: number; col: number }
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48 | { type: "flipBack" }
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49 | { type: "reset" };
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50
fb9bcd3145cb [ReactGames] Few games I made using react just to practice few things.
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51 interface Position {
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52 row: number;
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53 col: number;
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54 }
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55
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56 interface GameState {
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57 board: CardValue[][];
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58 open: Position[]; // cards currently face-up but not yet decided (max 2)
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59 busy: boolean; // UI locked while we wait to flip cards back
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60 }
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61
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62 /* ──────────────────── Helpers ──────────────────── */
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63 const shuffle = <T,>(arr: T[]): T[] =>
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64 [...arr].sort(() => Math.random() - 0.5);
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65
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66 const makeBoard = (): CardValue[][] => {
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67 // two of each from 1-10, then shuffle and slice into 4×5
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68 const values = shuffle(
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69 Array.from({ length: 10 }, (_, i) => i + 1).flatMap((v) => [v, v])
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70 );
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71
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72 return Array.from({ length: 4 }, (_, r) =>
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73 Array.from({ length: 5 }, (_, c) => ({
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74 value: values[r * 5 + c],
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75 isFacing: false,
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76 isSolved: false,
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77 }))
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78 );
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79 };
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80
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81 /* ──────────────────── Context ──────────────────── */
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82 const BoardContext = createContext<React.Dispatch<Action> | null>(null);
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83 const useBoardDispatch = () => {
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84 const ctx = useContext(BoardContext);
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85 if (!ctx) throw new Error("BoardContext missing");
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86 return ctx;
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87 };
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88
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89 /* ──────────────────── Reducer ──────────────────── */
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90 const initial = (): GameState => ({ board: makeBoard(), open: [], busy: false });
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91
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92 function reducer(state: GameState, action: Action): GameState {
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93 switch (action.type) {
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94 case "reset":
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95 return initial();
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96
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97 case "flipBack": {
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98 // hide the two open cards
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99 const [a, b] = state.open;
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100 const nextBoard = state.board.map((row, r) =>
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101 row.map((card, c) =>
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102 (r === a.row && c === a.col) || (r === b.row && c === b.col)
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103 ? { ...card, isFacing: false }
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104 : card
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105 )
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106 );
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107 return { board: nextBoard, open: [], busy: false };
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108 }
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109
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110 case "move": {
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111 if (state.busy) return state; // ignore clicks while waiting
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112
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113 const { row, col } = action;
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114 const target = state.board[row][col];
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115 if (target.isFacing || target.isSolved) return state;
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116
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117 // flip this one up
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118 const nextBoard = state.board.map((r, ri) =>
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119 r.map((c, ci) =>
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120 ri === row && ci === col ? { ...c, isFacing: true } : c
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121 )
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122 );
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123 const open = [...state.open, { row, col }];
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124
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125 if (open.length < 2) return { ...state, board: nextBoard, open };
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126
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127 // now we have two cards – decide match / mismatch
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128 const [a, b] = open;
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129 const first = nextBoard[a.row][a.col];
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130 const second = nextBoard[b.row][b.col];
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131
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132 if (first.value === second.value) {
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133 // match → mark solved, leave face-up
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134 const solvedBoard = nextBoard.map((r, ri) =>
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135 r.map((c, ci) =>
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136 (ri === a.row && ci === a.col) || (ri === b.row && ci === b.col)
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137 ? { ...c, isSolved: true }
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138 : c
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139 )
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140 );
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141 return { board: solvedBoard, open: [], busy: false };
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142 }
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143
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144 // mismatch → leave them up temporarily, then flip back via effect
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145 return { board: nextBoard, open, busy: true };
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146 }
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147
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148 default:
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149 return state;
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150 }
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151 }
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152
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153 /* ──────────────────── UI Components ──────────────────── */
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154 const Card = ({ row, col, card }: CardProp) => {
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155 const dispatch = useBoardDispatch();
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156 const style: React.CSSProperties = {
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157 width: 60,
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158 height: 80,
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159 margin: 4,
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160 fontSize: 24,
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161 display: "flex",
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162 alignItems: "center",
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163 justifyContent: "center",
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164 background: card.isSolved
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165 ? "#8bc34a"
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166 : card.isFacing
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167 ? "#fff"
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168 : "#90caf9",
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169 cursor: card.isSolved ? "default" : "pointer",
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170 borderRadius: 6,
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171 userSelect: "none",
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172 };
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173 return (
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174 <div style={style} onClick={() => dispatch({ type: "move", row, col })}>
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175 {card.isFacing || card.isSolved ? card.value : "🂠"}
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176 </div>
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177 );
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178 };
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179
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180 const Row = ({ row, rowPos }: RowProp) => (
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181 <div style={{ display: "flex" }}>
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182 {row.map((card, idx) => (
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183 <Card key={idx} row={rowPos} col={idx} card={card} />
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184 ))}
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185 </div>
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186 );
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187
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188 /* ──────────────────── Root component ──────────────────── */
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189 export const MemoryGame = () => {
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190 const [state, dispatch] = useReducer(reducer, undefined, initial);
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191
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192 /* Handle “flipBack” after 1 s for a mismatch */
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193 useEffect(() => {
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194 if (state.busy) {
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195 const t = setTimeout(() => dispatch({ type: "flipBack" }), 1000);
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196 return () => clearTimeout(t);
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197 }
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198 }, [state.busy]);
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199
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200 /* Quick win detection */
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201 const solved = state.board.every((r) => r.every((c) => c.isSolved));
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202
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203 return (
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204 <>
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205 <h3 style={{ textAlign: "center" }}>
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206 {solved ? "🎉 You won!" : "Memory Game"}
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207 </h3>
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208 <BoardContext.Provider value={dispatch}>
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209 {state.board.map((row, idx) => (
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210 <Row key={idx} rowPos={idx} row={row} />
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211 ))}
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212 </BoardContext.Provider>
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213
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214 <div style={{ textAlign: "center", marginTop: 12 }}>
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215 <button onClick={() => dispatch({ type: "reset" })}>Reset</button>
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216 </div>
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217 </>
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218 );
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219 };
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220