Mercurial
annotate react_games/src/Connectfour/answer.tsx @ 71:75de5903355c
Giagantic changes that update Dowa library to be more align with stb style array and hashmap. Updated Seobeo to be caching on server side instead of file level caching. Deleted bunch of things I don't really use.
| author | June Park <parkjune1995@gmail.com> |
|---|---|
| date | Sun, 28 Dec 2025 20:34:22 -0800 |
| parents | fb9bcd3145cb |
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| rev | line source |
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1 import { |
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2 useReducer, createContext, useContext, memo, Dispatch |
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3 } from 'react' |
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4 |
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5 enum P { R = '🔴', Y = '🟡', _ = '' } |
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6 |
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7 type Board = P[][] // 6 rows × 7 cols |
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8 type Status = 'PLAYING' | 'TIE' | 'R_WON' | 'Y_WON' |
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9 |
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10 type Action = |
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11 | { type: 'DROP'; col: number } |
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12 | { type: 'RESET' } |
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13 |
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14 interface State { |
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15 board: Board |
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16 turn: P.R | P.Y |
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17 status: Status |
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18 } |
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19 |
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20 const ROWS = 6, COLS = 7 |
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21 const emptyBoard = (): Board => |
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22 Array.from({ length: ROWS }, () => Array(COLS).fill(P._)) |
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23 |
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24 const init: State = { board: emptyBoard(), turn: P.R, status: 'PLAYING' } |
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25 |
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26 function firstEmptyRow(board: Board, col: number): number | null { |
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27 for (let r = ROWS - 1; r >= 0; r--) if (board[r][col] === P._) return r |
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28 return null |
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29 } |
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30 |
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31 function scanWinner(b: Board): Status { |
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32 const lines = [ |
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33 [ 1, 0], [0, 1], // vertical, horizontal |
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34 [ 1, 1], [1, -1], // two diagonals |
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35 ] |
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36 for (let r = 0; r < ROWS; r++) |
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37 for (let c = 0; c < COLS; c++) |
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38 if (b[r][c] !== P._) |
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39 for (const [dr, dc] of lines) |
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40 if ( |
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41 b[r + dr]?.[c + dc] === b[r][c] && |
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42 b[r + 2*dr]?.[c + 2*dc] === b[r][c] && |
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43 b[r + 3*dr]?.[c + 3*dc] === b[r][c] |
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44 ) |
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45 return b[r][c] === P.R ? 'R_WON' : 'Y_WON' |
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46 |
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47 return b.flat().every(p => p !== P._) ? 'TIE' : 'PLAYING' |
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48 } |
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49 |
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50 |
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51 function reducer(s: State, a: Action): State { |
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52 if (a.type === 'RESET') return init |
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53 if (s.status !== 'PLAYING') return s // game over |
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54 |
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55 const row = firstEmptyRow(s.board, a.col) |
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56 if (row == null) return s // full column |
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57 |
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58 // clone touched row only |
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59 const newRow = [...s.board[row]] |
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60 newRow[a.col] = s.turn |
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61 const newBoard = s.board.map((r, i) => (i === row ? newRow : r)) |
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62 |
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63 const nextTurn = s.turn === P.R ? P.Y : P.R |
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64 const status = scanWinner(newBoard) |
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65 |
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66 return { board: newBoard, turn: nextTurn, status } |
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67 } |
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68 |
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69 const DispatchCtx = createContext<Dispatch<Action> | null>(null) |
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70 const useGameDispatch = () => { |
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71 const d = useContext(DispatchCtx) |
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72 if (!d) throw new Error('outside provider') |
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73 return d |
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74 } |
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75 |
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76 /* ------- Leaf ------- */ |
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77 interface CellProps { v: P } |
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78 const Cell = memo<CellProps>(({ v }) => ( |
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79 <div style={{ |
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80 width: 52, height: 52, margin: 2, borderRadius: '50%', |
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81 background: '#0e2a5a', display: 'grid', placeItems: 'center', |
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82 fontSize: 30 |
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83 }}> |
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84 {v} |
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85 </div> |
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86 )) |
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87 |
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88 /* ------- Column button ------- */ |
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89 const ColBtn = ({ col }: { col: number }) => { |
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90 const dispatch = useGameDispatch() |
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91 return ( |
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92 <button |
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93 style={{ flex: 1, height: 20, cursor: 'pointer' }} |
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94 onClick={() => dispatch({ type: 'DROP', col })} |
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95 /> |
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96 ) |
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97 } |
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98 |
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99 /* ------- Board ------- */ |
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100 const BoardView = memo(({ board }: { board: Board }) => ( |
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101 <div> |
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102 {/* clickable top buttons */} |
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103 <div style={{ display: 'flex' }}> |
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104 {Array.from({ length: COLS }, (_, c) => <ColBtn key={c} col={c} />)} |
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105 </div> |
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106 |
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107 {/* grid */} |
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108 {board.map((row, r) => ( |
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109 <div key={r} style={{ display: 'flex' }}> |
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110 {row.map((v, c) => <Cell key={c} v={v} />)} |
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111 </div> |
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112 ))} |
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113 </div> |
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114 )) |
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115 |
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116 function ConnectFour() { |
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117 const [state, dispatch] = useReducer(reducer, init) |
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118 |
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119 return ( |
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120 <DispatchCtx.Provider value={dispatch}> |
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121 <h2 style={{ textAlign: 'center' }}> |
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122 {state.status === 'PLAYING' && `Turn: ${state.turn}`} |
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123 {state.status === 'TIE' && 'Tie game'} |
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124 {state.status === 'R_WON' && 'Red wins!'} |
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125 {state.status === 'Y_WON' && 'Yellow wins!'} |
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126 </h2> |
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127 |
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128 <BoardView board={state.board} /> |
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129 |
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130 {state.status !== 'PLAYING' && ( |
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131 <button style={{ marginTop: 16 }} onClick={() => dispatch({ type: 'RESET' })}> |
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132 Play again |
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133 </button> |
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134 )} |
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135 </DispatchCtx.Provider> |
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136 ) |
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137 } |
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138 |
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139 export { |
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140 ConnectFour, |
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141 } |