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| import { useState } from 'react';
function Square({ value, onSquareClick, isWinningSquare }) {
const backgroundColor = isWinningSquare ? 'yellow' : 'white';
return (
<button
className="square"
onClick={onSquareClick}
style={{ backgroundColor }}
>
{value}
</button>
);
}
function Board({ xIsNext, squares, onPlay, winningSquares }) {
function handleClick(i) {
if (calculateWinner(squares) || squares[i]) {
return;
}
const nextSquares = squares.slice();
if (xIsNext) {
nextSquares[i] = 'X';
} else {
nextSquares[i] = 'O';
}
onPlay(nextSquares, i);
}
const winner = calculateWinner(squares)?.winner;
const isDraw = !winner && squares.every(Boolean);
let status;
if (winner) {
status = 'Winner: ' + winner;
} else if (isDraw) {
status = "It's a draw!";
} else {
status = 'Next player: ' + (xIsNext ? 'X' : 'O');
}
return (
<>
<div className="status">{status}</div>
{Array(3).fill(null).map((_, rowIndex) => (
<div className="board-row" key={rowIndex}>
{Array(3).fill(null).map((_, colIndex) => {
const index = rowIndex * 3 + colIndex;
return (
<Square
key={index}
value={squares[index]}
onSquareClick={() => handleClick(index)}
isWinningSquare={winningSquares?.includes(index)}
/>
);
})}
</div>
))}
</>
);
}
export default function Game() {
const [history, setHistory] = useState([{ squares: Array(9).fill(null), position: null }]);
const [currentMove, setCurrentMove] = useState(0);
const [isAscending, setIsAscending] = useState(true);
const xIsNext = currentMove % 2 === 0;
const currentSquares = history[currentMove].squares;
function handlePlay(nextSquares, position) {
const nextHistory = [...history.slice(0, currentMove + 1), { squares: nextSquares, position }];
setHistory(nextHistory);
setCurrentMove(nextHistory.length - 1);
}
function jumpTo(nextMove) {
setCurrentMove(nextMove);
}
function toggleSortOrder() {
setIsAscending(!isAscending);
}
const winnerInfo = calculateWinner(currentSquares);
const winningSquares = winnerInfo ? winnerInfo.line : null;
const sortedMoves = isAscending ? history : [...history].reverse();
const moves = sortedMoves.map((entry, move) => {
const totalMoves = history.length - 1;
const adjustedMove = isAscending ? move : totalMoves - move;
let description;
if (adjustedMove === totalMoves && totalMoves !== 0) {
description = `You are at move ${totalMoves}`;
} else if (adjustedMove > 0) {
const row = Math.ceil((entry.position + 1) / 3);
const col = (entry.position + 1) - (row - 1) * 3;
description = `Go to move #${adjustedMove} (row: ${row}, col: ${col})`;
} else {
description = 'Go to game start';
}
return (
<li key={adjustedMove}>
<button onClick={() => jumpTo(adjustedMove)}>{description}</button>
</li>
);
});
return (
<div className="game">
<div className="game-board">
<Board
xIsNext={xIsNext}
squares={currentSquares}
onPlay={handlePlay}
winningSquares={winningSquares}
/>
</div>
<div className="game-info">
<button onClick={toggleSortOrder}>
{isAscending ? 'Sort Descending' : 'Sort Ascending'}
</button>
<ol>{moves}</ol>
</div>
</div>
);
}
function calculateWinner(squares) {
const lines = [
[0, 1, 2],
[3, 4, 5],
[6, 7, 8],
[0, 3, 6],
[1, 4, 7],
[2, 5, 8],
[0, 4, 8],
[2, 4, 6],
];
for (let i = 0; i < lines.length; i++) {
const [a, b, c] = lines[i];
if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
return { winner: squares[a], line: lines[i] };
}
}
return null;
}
|