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@iagox86
Created January 30, 2019 23:47
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import React from 'react';
import ReactDOM from 'react-dom';
import _ from 'lodash';
import './index.css';
function Square(props) {
return (
<button className="square" onClick={props.onClick}>
{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(var i = 0; i < lines.length; i++) {
const e = lines[i];
if(squares[e[0]] && squares[e[0]] === squares[e[1]] && squares[e[1]] === squares[e[2]]) {
return squares[e[0]];
}
};
return null;
}
function calculateMovesLeft(squares) {
return _.reject(squares, (s) => s).length
}
class Board extends React.Component {
renderSquare(i) {
return (
<Square
value={this.props.squares[i]}
onClick={() => this.props.onClick(i)}
/>
);
}
render() {
return (
<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 {
handleClick(i) {
const new_squares = this.state.history[0].slice();
if(calculateWinner(new_squares)) {
alert("There is already a winner!");
return;
} else if(new_squares[i]) {
alert("There is already something in that square!");
return;
}
new_squares[i] = this.state.currentPlayer;
this.setState({
history: [new_squares, ...this.state.history],
currentPlayer: this.state.currentPlayer === 'X' ? 'O' : 'X',
});
}
reset() {
this.setState({
history: [Array(9).fill(null)],
currentPlayer: 'X',
});
}
undo(n=1) {
if(this.state.history.length < n + 1) {
alert("Not enough state!");
return;
}
this.setState({
history: this.state.history.slice(n),
currentPlayer: (this.state.history.length - n) % 2 ? 'X' : 'O',
});
}
constructor(props) {
super(props);
this.state = {
history: [Array(9).fill(null)],
currentPlayer: 'X',
};
}
render() {
const winner = calculateWinner(this.state.history[0]);
let status = 'Next player: ' + this.state.currentPlayer;
if(winner) {
status = "WINNER: " + winner;
} else if(calculateMovesLeft(this.state.history[0]) === 0) {
status = "DRAW!";
}
const moves = _.map(this.state.history.slice(1), (move, index) => {
return (
<li key={move}>
<button onClick={() => this.undo(this.state.history.length - index - 1)}>Go back to move {index}</button>
</li>
)
});
return (
<div>
<div className="game">
<div className="game-board">
<Board
squares={this.state.history[0]}
currentPlayer={this.state.currentPlayer}
onClick={(i) => this.handleClick(i)}
/>
</div>
<div className="game-info">
<div>{ status }</div>
<ul>{ moves }</ul>
</div>
</div>
<button onClick={() => this.reset()}>Reset</button>
<button onClick={() => this.undo()}>Undo</button>
</div>
);
}
}
// ========================================
ReactDOM.render(
<Game />,
document.getElementById('root')
);
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