server.js

const express = require('express');
const app = express();

const server = require('http').Server(app);
const io = require('socket.io')(server);

io.set('origins', '*:*');
server.listen(3002);

const players = [];

const socketIO = () => {
  //CONNECTION
  io.on("connection", (socket) => {
    players[socket.id] = {
      x: 300,
      y: 300,
      score : 10
    };
    //ENVOI ID
    console.log("Identification du joueur", socket.id);
    socket.emit('id', socket.id)

    //RECEPTION KEYBOARD
    socket.on('movement', function (data) {
    
      var player = players[socket.id] || {};
      if (data.left) {
        player.x -= 5;
      }
      if (data.up) {
        player.y -= 5;
        player.score +=10;
        console.log(players);
      }
      if (data.right) {
        player.x += 5;
      }
      if (data.down) {
        player.y += 5;
      }
     console.log(players);
     
      io.emit('stateok', players);

    });

    //DECONNECTION
    socket.on("disconnect", () => {
      console.log("Joueur déconnecté", socket.id);
      var i = players.indexOf(socket.id);
      if (i !== -1) {
        players.splice(i, 1);
      }
      console.log(players);
      io.emit('disconnect', players);
    });
  });
}

module.exports = socketIO;