How do you implement real-time features in React Native?

Question

Accepted Answer

**Real-time patterns:**

**1. WebSockets:**
```tsx
const ws = new WebSocket(url);
ws.onmessage = (e) => updateState(JSON.parse(e.data));
```

**2. Server-Sent Events:**
```tsx
const eventSource = new EventSource(url);
eventSource.onmessage = (e) => updateState(e.data);
```

**3. Pusher/Ably:**
```tsx
const channel = pusher.subscribe("updates");
channel.bind("new-data", handleUpdate);
```

**4. Firebase Realtime DB:**
```tsx
firebase.database().ref("messages").on("value", (snap) => {
  setMessages(snap.val());
});
```

**Best practices:**
- Handle disconnections gracefully
- Implement reconnection strategies
- Use optimistic updates
- Throttle high-frequency updates

React Native: How do you implement real-time features in React Native?