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November 24, 2018 03:44
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function Square(props) { // The properties of the square contain the "onClick" function as well as the "value" number | |
return ( | |
<button className="square" | |
onClick={props.onClick}>{/** (1) When I click on the button, it triggers the function onClick from the props object. */} | |
{props.value} | |
</button> | |
); | |
} | |
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; | |
} | |
class Board extends React.Component { | |
renderSquare(i) { // (2) We return the Square, giving him his properties according to the parameter "i" | |
return ( | |
{/** Here we pass to the Square its "onClick" function coming from the Board props which will be called at (1) | |
and "value" properties */} | |
<Square value={this.props.squares[i]} onClick={() => this.props.onClick(i)}/> | |
); | |
} | |
render() { | |
return ( | |
<div> | |
<div className="status">{status}</div> | |
<div className="board-row"> | |
{/** Here the squares are rendered (2). | |
You can see the "i" parameter which will define the parameter used in the function passed as | |
"onClick" property to the Square */} | |
{this.renderSquare(0)}{/** (4) amongst others */} | |
{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 { | |
constructor(props) { | |
super(props); | |
this.state = { | |
history: [{ | |
squares: Array(9).fill(null), | |
}], | |
xIsNext: true, | |
}; | |
} | |
handleClick(i) { | |
const history = this.state.history; | |
const current = history[history.length - 1]; | |
const squares = current.squares.slice(); | |
if (calculateWinner(squares) || squares[i]) { | |
return; | |
} | |
squares[i] = this.state.xIsNext ? 'X' : 'O'; | |
this.setState({ | |
history: history.concat([{ | |
squares: squares, | |
}]), | |
xIsNext: !this.state.xIsNext, | |
}); | |
} | |
render() { | |
const history = this.state.history; | |
const current = history[history.length - 1]; | |
const winner = calculateWinner(current.squares); | |
let status; | |
if (winner) { | |
status = 'Winner: ' + winner; | |
} else { | |
status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O'); | |
} | |
return ( | |
<div className="game"> | |
<div className="game-board"> | |
<Board | |
squares={current.squares} | |
{/** The "handleClick" function will be called with the "i" parameter defined at (4) */} | |
onClick={(i) => this.handleClick(i)} | |
/> | |
</div> | |
<div className="game-info"> | |
<div>{status}</div> | |
<ol>{/* TODO */}</ol> | |
</div> | |
</div> | |
); | |
} | |
} | |
// ======================================== | |
ReactDOM.render( | |
<Game />, | |
document.getElementById('root') | |
); |
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