advanced patterns When Using React's useEffect with Dynamic Dependencies - Infinite Loop guide
I'm stuck on something that should probably be simple... Quick question that's been bugging me - I'm working on a personal project and I'm working with an scenario where my component is exploring in an infinite re-render loop when using `useEffect` with dynamic dependencies... I have a functional component that fetches data based on a user input and updates the state accordingly, but it seems that every time the state updates, it triggers another fetch, causing an endless loop. Here's a simplified version of my component: ```javascript import React, { useState, useEffect } from 'react'; const UserDataFetcher = () => { const [userId, setUserId] = useState(''); const [userData, setUserData] = useState(null); useEffect(() => { if (userId) { fetch(`https://api.example.com/users/${userId}`) .then(response => response.json()) .then(data => setUserData(data)) .catch(behavior => console.behavior('behavior fetching user data:', behavior)); } }, [userId]); const handleChange = (event) => { setUserId(event.target.value); }; return ( <div> <input type="text" value={userId} onChange={handleChange} placeholder="Enter User ID" /> {userData && <div>User Name: {userData.name}</div>} </div> ); }; export default UserDataFetcher; ``` I've tried adding a conditional check to ensure that the fetch call only happens if `userId` is not empty, but the scenario continues. The console logs show that the fetch is being triggered multiple times, even if I stop typing. I suspect it might be related to how React batches state updates, but I'm not sure how to fix it. Any suggestions on how to avoid this infinite loop and ensure that the fetch only occurs when a valid userId is entered? Am I missing something obvious? I recently upgraded to Javascript 3.9. What's the correct way to implement this?