Q: How can I implement a real-time order book using WebSockets in a cryptocurrency exchange?

Use WebSocket for real-time updates of the order book:

const WebSocket = require('ws');
const ws = new WebSocket('wss://example.com/orderbook');

ws.on('open', () => {
  console.log('WebSocket connection established');
  ws.send(JSON.stringify({ action: 'subscribe', channel: 'orderbook' }));
});

ws.on('message', (data) => {
  const orderBook = JSON.parse(data);
  console.log('Updated Order Book:', orderBook);
});

ws.on('error', (error) => {
  console.error('WebSocket error:', error);
});

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