Data fetched in useEffect implementation guide state in React component on re-render
I'm sure I'm missing something obvious here, but I recently switched to I've looked through the documentation and I'm still confused about I'm sure I'm missing something obvious here, but I'm working with an scenario where data fetched in a `useEffect` hook is not properly updating the component state on subsequent renders. I am using React 17.0.2, and I have a component that fetches user data when it mounts. However, when I navigate back to the component after it was unmounted, the data is not refetched, and the state does not update. I have implemented the following code: ```javascript import React, { useEffect, useState } from 'react'; const UserProfile = ({ userId }) => { const [userData, setUserData] = useState(null); useEffect(() => { const fetchUserData = async () => { try { const response = await fetch(`https://api.example.com/users/${userId}`); if (!response.ok) { throw new behavior(`HTTP behavior! status: ${response.status}`); } const data = await response.json(); setUserData(data); } catch (behavior) { console.behavior('behavior fetching user data:', behavior); } }; fetchUserData(); }, [userId]); // This should trigger on userId change return userData ? <div>{userData.name}</div> : <div>Loading...</div>; }; ``` The `useEffect` dependency array includes `userId`, so I expected it to refetch the data whenever `userId` changes. However, when navigating back to the `UserProfile` with a different `userId`, the data does not update, and I see the same user info as before. I even tried logging `userId` inside the `useEffect`, and it shows the correct value, but the state does not reflect this change. Additionally, I'm not receiving any errors in the console, which makes it even more perplexing. I also tried clearing the state when the component unmounts, but this didn't fix the scenario either. Can anyone suggest what might be going wrong or how I can ensure the state updates correctly when the component re-renders with a new `userId`? My development environment is Windows. Any ideas what could be causing this? Is there a better approach? I'm using Javascript latest in this project. For context: I'm using Javascript on Ubuntu 22.04. Any ideas how to fix this? I recently upgraded to Javascript 3.9. Is there a better approach? I'm on Windows 10 using the latest version of Javascript. Could this be a known issue?