How can I build real-time applications using Node.js?

How can I build real-time applications using Node.js?

You can build real-time applications using Node.js by leveraging libraries like Socket.IO, which enables real-time, bidirectional communication.

What are some use cases for real-time apps?

Common use cases include chat applications, live notifications, online gaming, and collaborative tools.

Can you give me a simple code example?

Sure! Here's a basic example using Socket.IO:

const express = require('express');
const http = require('http');
const socketIo = require('socket.io');

const app = express();
const server = http.createServer(app);
const io = socketIo(server);

io.on('connection', (socket) => {
  console.log('A user connected');
  socket.on('disconnect', () => {
    console.log('User disconnected');
  });
});

server.listen(3000, () => {
  console.log('Server is running on port 3000');
});

What are the performance considerations I should keep in mind?

You should consider scalability, managing memory usage, and optimizing event handling to ensure smooth performance.