advanced patterns with React State Updates in useEffect Hook and Async Operations
I'm maintaining legacy code that I've looked through the documentation and I'm still confused about I'm stuck on something that should probably be simple... After trying multiple solutions online, I still can't figure this out. I am working with a strange scenario with state updates inside a `useEffect` hook while performing asynchronous operations in my React app (React 17.0.2). I have a component that fetches data from an API and updates the state based on the response. However, I noticed that the state doesn't seem to reflect the latest data when I try to use it immediately after the fetch completes. Here's a simplified version of my code: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { const fetchData = async () => { setLoading(true); const response = await fetch('https://api.example.com/data'); const result = await response.json(); setData(result); setLoading(false); }; fetchData(); }, []); // This part fails to log the latest data useEffect(() => { if (!loading && data) { console.log('Fetched data:', data); // Trying to perform some operations based on the fetched data doSomethingWithData(data); } }, [loading, data]); const doSomethingWithData = (data) => { // Some operations with data console.log('Doing something with:', data); }; return <div>{loading ? 'Loading...' : JSON.stringify(data)}</div>; }; export default MyComponent; ``` Initially, I thought I was handling the asynchronous nature correctly, but I often see the `Fetched data:` log showing `null` or outdated data. I've also tried moving the `doSomethingWithData` function call directly inside the first `useEffect`, but it still resulted in the same scenario. Could it be that `setData` is asynchronous and the second `useEffect` is running before the state update completes? I am really confused about the timing of state updates in React. Any insights on how to ensure my component correctly reflects the latest fetched data would be greatly appreciated. I'm working on a service that needs to handle this. For context: I'm using Javascript on Linux. For context: I'm using Javascript on Linux. Any help would be greatly appreciated! Cheers for any assistance! My team is using Javascript for this desktop app. What would be the recommended way to handle this?