[React 연습 3일차] 리액트 TicTacToe Game 구현

 

 

 

TicTacToe Game 구현하기 연습 ! 

 

function Square(props) {
    return (
        <button className="square" onClick={props.onClick}>
            {props.value}
        </button>
    )
}

class Board extends React.Component {
    constructor(props) {
        super(props)

        this.state = {
            squares: Array(9).fill(null),
            xIsNext:true,
        };
    }

    handleClick = (i) => {
        const squares = this.state.squares.slice();
        // winner 정해진 후 클릭 안되도록 
        // 질문 squares[i] 는 왜 있는걸까,,,,↓↓ -> 해당 값이 True일 때 ! (null 이 아닐 때  == 이미 클릭 했을 때) 
        console.log(squares[i])
        if(calculateWinner(squares) || squares[i]){
            return;
        }
        squares[i] = this.state.xIsNext ? 'X' : 'O'; 
        this.setState({ 
            squares: squares, 
            xIsNext:!this.state.xIsNext 
        })
    }

    renderSquare(i) {
        return (
            <Square
                value={this.state.squares[i]}
                onClick={() => this.handleClick(i)}
            />
        )
    }

    render() {
        const winner = calculateWinner(this.state.squares);
        let status;
        if(winner){
            status = 'Winner: ' + winner;
        }else{
            status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
        }
        return (
            <div>
                <div className="status">{status}</div>
                <div className="board-row">
                    {this.renderSquare(0)}
                    {this.renderSquare(1)}
                    {this.renderSquare(2)}
                </div>
                <div className="board-row">
                    {this.renderSquare(3)}
                    {this.renderSquare(4)}
                    {this.renderSquare(5)}
                </div>
                <div className="board-row">
                    {this.renderSquare(6)}
                    {this.renderSquare(7)}
                    {this.renderSquare(8)}
                </div>
            </div>
        )
    }
}

class Game extends React.Component {
    render() {
        return (
            <div className="game">
                <div className="game-board">
                    <Board />
                </div>
                <div className="game-info">
                    <div >{/* statue */}</div>
                    <ol>{/* todo */}</ol>
                </div>
            </div>
        )
    }
}

ReactDOM.render(
    <Game />,
    document.querySelector('#root')
)

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;
}

 

 

 

클릭하고 winner 정해지고 + 클릭 방지까지 이해하기 완료 !! 아직 못외웠다 - 내일 외우기 ! !