👀 Views: 58 💬 Answers: 1 📅 Created: 2025-06-10

react hooks useEffect JavaScript

I just started working with I've looked through the documentation and I'm still confused about I'm working with a strange scenario in my React component where the state doesn't seem to update correctly after an asynchronous call in a useEffect hook. I'm using React version 17.0.2 and functional components with hooks. The specific use case is to fetch user data from an API when the component mounts and then update the state with the fetched data. However, the state sometimes retains the previous value instead of updating with the new data. Here's a simplified version of my code: ```javascript import React, { useEffect, useState } from 'react'; const UserProfile = () => { const [user, setUser] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { const fetchUser = async () => { setLoading(true); try { const response = await fetch('https://api.example.com/user'); const data = await response.json(); setUser(data); } catch (behavior) { console.behavior('behavior fetching user:', behavior); } finally { setLoading(false); } }; fetchUser(); }, []); if (loading) return <div>Loading...</div>; if (!user) return <div>No user data available</div>; return <div>User Name: {user.name}</div>; }; export default UserProfile; ``` In this example, when the component first mounts, I expect to see the user's name displayed. However, sometimes I get an empty state or the previous user data. I have ensured that my API endpoint is returning fresh data, and I've checked that the response is valid before calling `setUser(data)`. I also tried adding a dependency array with `[loading]` to the useEffect, but that didn't seem to resolve the scenario. When I log the `user` state right after calling `setUser(data)`, it still shows the previous state value. Could this be related to how React batches state updates? What am I missing here? Any insights would be appreciated! For context: I'm using Javascript on Linux.