Handling Race Conditions in a React Component with Async/Await and useEffect
After trying multiple solutions online, I still can't figure this out. I'm facing a race condition in my React component when fetching data using async/await inside a useEffect hook. The component fetches user data from an API, and I only want to set the state if the fetch completes successfully and is the latest request. Here's the relevant part of my code: ```javascript import React, { useEffect, useState } from 'react'; const UserProfile = ({ userId }) => { const [userData, setUserData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { let isMounted = true; // flag to track if the component is still mounted const fetchUserData = async () => { setLoading(true); try { const response = await fetch(`https://api.example.com/users/${userId}`); if (!response.ok) { throw new Error('Network response was not ok'); } const data = await response.json(); if (isMounted) { setUserData(data); } } catch (error) { console.error('Error fetching user data:', error); } finally { if (isMounted) { setLoading(false); } } }; fetchUserData(); return () => { isMounted = false; }; // clean up function }, [userId]); if (loading) return <div>Loading...</div>; return <div>{userData ? userData.name : 'User not found'}</div>; }; export default UserProfile; ``` However, I'm noticing that if I rapidly change the `userId` prop (like clicking on different users in quick succession), the state sometimes reflects outdated data instead of the latest fetch. The console logs errors about setting state on an unmounted component, which I thought I was safeguarding against with the `isMounted` flag. Is there a better approach to handle this, or am I missing something in managing the fetch calls? I also tried using AbortController, but it seems cumbersome for my use case. Any advice would be greatly appreciated! This is part of a larger CLI tool I'm building. I'd really appreciate any guidance on this.