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How to determine the winner of tic-tac-toe in React Native?
I decided to start learning React Native here and transfer tic-tac-toe from the usual react to native.
Source:
function Square(props) {
return (
<Pressable style={styles.button} onPress={props.onPress}>
{props.value}
</Pressable>
);
}
class Board extends React.Component {
renderSquare(i) {
return (
<Square
value={this.props.squares[i]}
onPress={() => this.props.onPress(i)}
/>
);
}
render() {
return (
<View style={styles.container}>
<StatusBar style="auto" />
<Pressable style={styles.boardRow}>
{this.renderSquare(0)}
{this.renderSquare(1)}
{this.renderSquare(2)}
</Pressable>
<Pressable style={styles.boardRow}>
{this.renderSquare(3)}
{this.renderSquare(4)}
{this.renderSquare(5)}
</Pressable>
<Pressable style={styles.boardRow}>
{this.renderSquare(6)}
{this.renderSquare(7)}
{this.renderSquare(8)}
</Pressable>
</View>
);
}
}
class Game extends React.Component {
constructor(props) {
super(props);
this.state = {
squares: Array(9).fill(null),
xIsNext: true,
};
}
handlePress(i) {
const squares = this.state.squares.slice();
if (calculateWinner(squares) || squares[i]) {
return;
}
squares[i] = this.state.xIsNext ? "X" : "O";
this.setState({
squares: squares,
xIsNext: !this.state.xIsNext,
});
}
jumpTo(squares) {
this.setState({
squares: Array(9).fill(null),
xIsNext: true,
});
}
render() {
const winner = calculateWinner(this.state.squares);
let status;
if (winner) {
status = 'Выиграл: ' + winner;
} else {
status = 'Следующий ход: ' + (this.state.xIsNext ? 'X' : 'O');
}
return (
<View className="game">
<View className="game-board">
<Board
squares={this.state.squares}
onPress={(i) => this.handlePress(i)}
/>
</View>
<View style={styles.menu}>
<Text style={styles.statusText}>{status}</Text>
<Pressable style={styles.backButton} onPress={() => this.jumpTo()}>
<Text style={styles.textButton}> 'К началу игры' </Text>
</Pressable>
</View>
</View>
);
}
}
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 squares[a];
}
}
return null;
}
const styles = StyleSheet.create({
});
export default Game;
handlePress(i) {
const squares = this.state.squares.slice();
if (calculateWinner(squares) || squares[i]) {
return;
}
squares[i] = this.state.xIsNext ?
<Text style={styles.gameSquares}>X</Text> : <Text style={styles.gameSquares}>O</Text>;
this.setState({
squares: squares,
xIsNext: !this.state.xIsNext,
});
}
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