Handling WebSocket Messages in React with State Management - Issues with Delayed Updates
I'm currently working on a React application that uses WebSockets for real-time data updates... I've set up a connection to a WebSocket server, and I can successfully receive messages. However, I'm experiencing issues with the state not updating as expected when I receive messages. Specifically, the component does not re-render with the new data sometimes, leading to stale information being displayed. Here's a simplified version of my WebSocket setup in a functional component: ```javascript import React, { useEffect, useState } from 'react'; const WebSocketComponent = () => { const [messages, setMessages] = useState([]); useEffect(() => { const socket = new WebSocket('ws://example.com/socket'); socket.onmessage = (event) => { const newMessage = JSON.parse(event.data); setMessages((prevMessages) => [...prevMessages, newMessage]); }; return () => { socket.close(); }; }, []); return ( <div> <h1>WebSocket Messages</h1> <ul> {messages.map((msg, index) => ( <li key={index}>{msg.text}</li> ))} </ul> </div> ); }; export default WebSocketComponent; ``` I've verified that the WebSocket messages are indeed arriving by logging them to the console, but the state update is inconsistent. Sometimes, new messages appear correctly, but other times, it feels like the component is not re-rendering with the new state. I've tried using `React.memo` to optimize performance because I also have a parent component that re-renders frequently, but that hasn't seemed to fix the issue. Is there something I'm missing in how I'm managing the state or the WebSocket connection? Any guidance on ensuring the state updates reliably with each message would be greatly appreciated! I'm using React 17.0.2 and the issue happens across different browsers. I'm developing on Linux with Javascript. What am I doing wrong?