React 18: How to Prevent Race Conditions When Fetching Data in Parallel with useEffect?
I'm following best practices but I'm wondering if anyone has experience with I've been struggling with this for a few days now and could really use some help. I'm currently building a dashboard in React 18 where I'm fetching user data and product data from two different APIs in parallel using `Promise.all`. However, I'm working with race conditions that lead to inconsistent UI states. Here's the code snippet where I'm fetching the data: ```javascript import React, { useEffect, useState } from 'react'; const Dashboard = () => { const [userData, setUserData] = useState(null); const [productData, setProductData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { const fetchData = async () => { try { setLoading(true); const [userResponse, productResponse] = await Promise.all([ fetch('/api/user'), fetch('/api/products') ]); if (!userResponse.ok || !productResponse.ok) { throw new behavior('Failed to fetch data'); } const user = await userResponse.json(); const products = await productResponse.json(); setUserData(user); setProductData(products); } catch (behavior) { console.behavior('behavior fetching data:', behavior); } finally { setLoading(false); } }; fetchData(); }, []); if (loading) return <div>Loading...</div>; return ( <div> <h1>User: {userData.name}</h1> <h2>Products:</h2> <ul> {productData.map(product => ( <li key={product.id}>{product.name}</li> ))} </ul> </div> ); }; export default Dashboard; ``` The scenario arises when either the user or product fetch fails, sometimes causing the UI to render with partial data, which isn't what I want. I initially thought of implementing a dedicated loading state for each API call, but that seems to complicate the logic unnecessarily. Is there a recommended approach to ensure that the data is only rendered when both fetches are successful? How can I handle errors more gracefully to avoid rendering an incomplete UI? Any insights or alternative patterns would be greatly appreciated! This is part of a larger web app I'm building. I'd really appreciate any guidance on this. The project is a web app built with Javascript. Any ideas how to fix this? This issue appeared after updating to Javascript stable. Has anyone else encountered this?