オンラインポーカー（2人対戦）

▼ サーバーコード（server.js）

以下を server.js として保存し、node server.js で起動してください。

// 必要: npm install ws
const WebSocket = require("ws");
const wss = new WebSocket.Server({ port: 8080 });

let players = [];
let gameState = null;

function createDeck() {
  const suits = ["♠","♥","♦","♣"];
  const ranks = ["2","3","4","5","6","7","8","9","10","J","Q","K","A"];
  let deck = [];
  for (let s of suits) for (let r of ranks) deck.push({suit:s, rank:r});
  return deck.sort(() => Math.random() - 0.5);
}

function startGame() {
  const deck = createDeck();
  gameState = {
    hands: [
      deck.splice(0,5),
      deck.splice(0,5)
    ],
    pot: 0,
    turn: 0
  };
}

wss.on("connection", ws => {
  players.push(ws);

  if (players.length === 2) {
    startGame();
    players.forEach((p,i)=>{
      p.send(JSON.stringify({
        type:"start",
        hand: gameState.hands[i],
        turn: gameState.turn
      }));
    });
  }

  ws.on("message", msg => {
    const data = JSON.parse(msg);

    if (data.type === "bet") {
      gameState.pot += data.amount;
      gameState.turn = 1 - gameState.turn;

      players.forEach((p,i)=>{
        p.send(JSON.stringify({
          type:"update",
          pot: gameState.pot,
          turn: gameState.turn
        }));
      });
    }
  });
});