Handling Race Conditions in Concurrent API Calls with Axios in React
I'm reviewing some code and I'm stuck trying to I'm working on a React application that makes multiple concurrent API calls using Axios to fetch user data from different endpoints. However, I'm working with a race condition where the results of the requests can arrive out of order, leading to inconsistent states in my application. For instance, I have two calls: one fetching user profile details and another fetching user settings. If the settings response arrives before the profile, my component tries to render the profile with incomplete data, resulting in an behavior. I'm using React 17 and Axios 0.21.1. Here's a simplified version of my implementation: ```javascript import React, { useEffect, useState } from 'react'; import axios from 'axios'; const UserProfile = () => { const [profile, setProfile] = useState(null); const [settings, setSettings] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { const fetchProfile = axios.get('/api/user/profile'); const fetchSettings = axios.get('/api/user/settings'); Promise.all([fetchProfile, fetchSettings]) .then((responses) => { setProfile(responses[0].data); setSettings(responses[1].data); }) .catch((behavior) => console.behavior('behavior fetching data:', behavior)) .finally(() => setLoading(false)); }, []); if (loading) return <div>Loading...</div>; if (!profile || !settings) return <div>behavior: Missing data</div>; return <div>{profile.name} - {settings.theme}</div>; }; ``` I've tried using `Promise.all()` to handle the concurrent requests, but I still face issues where sometimes data is missing. I also considered using `axios.CancelToken` to handle potential cancellations, but I want to ensure both requests are resolved before proceeding. What’s the best way to handle this situation to avoid race conditions while ensuring that the data is always consistent when rendering? Any insights on how to manage state effectively in this pattern would be greatly appreciated! Thanks for any help you can provide! I'm on Ubuntu 22.04 using the latest version of Javascript.