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Reagent port of official React tutorial code upto Declaring a Winner https://facebook.github.io/react/tutorial/tutorial.html#declaring-a-winner
(ns react-tutorial.core
(:require
[reagent.core :as r]))
(defn calculateWinner [squares]
(let [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]]]
(->> lines
(filter (fn [[a b c]]
(and
(not (nil? (get squares a)))
(= (get squares a)
(get squares b)
(get squares c)))))
first
first
(get squares))))
(defn Square [value click-fn]
[:button.square {:on-click click-fn} value])
(defn Board []
(let [squares (r/atom (apply vector (repeat 9 nil)))
xIsNext (r/atom true)
handle-click #(if-not (or (calculateWinner @squares) (@squares %))
(do (swap! squares assoc % (if @xIsNext "X" "O"))
(swap! xIsNext not)))
renderSquare (fn [i]
[Square (get @squares i) #(handle-click i)])]
(fn []
[:div
[:div.status (if-some [winner (calculateWinner @squares)]
(str "Winner: " winner)
(str "Next player: " (if @xIsNext "X" "O")))]
[:div.board-row
[renderSquare 0]
[renderSquare 1]
[renderSquare 2]]
[:div.board-row
[renderSquare 3]
[renderSquare 4]
[renderSquare 5]]
[:div.board-row
[renderSquare 6]
[renderSquare 7]
[renderSquare 8]]])))
(defn Game []
[:div.game
[:div.game-board
[Board]]
[:div.game-info
[:div]
[:ol]]])
(r/render
[Game]
(js/document.getElementById "container"))
function Square(props) {
return (
<button className="square" onClick={() => props.onClick()}>
{props.value}
</button>
);
}
class Board extends React.Component {
constructor() {
super();
this.state = {
squares: Array(9).fill(null),
xIsNext: true,
};
}
handleClick(i) {
const squares = this.state.squares.slice();
if (calculateWinner(squares) || squares[i]) {
return;
}
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>{/* status */}</div>
<ol>{/* TODO */}</ol>
</div>
</div>
);
}
}
// ========================================
ReactDOM.render(
<Game />,
document.getElementById('container')
);
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;
}
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