React useEffect not firing on state update when nested in a callback function
I've searched everywhere and can't find a clear answer. After trying multiple solutions online, I still can't figure this out. I'm experiencing an issue where my `useEffect` hook in a React component is not firing as expected when I update the component's state nested inside a callback function. I'm using React 17.0.2 and I have the following snippet: ```javascript import React, { useState, useEffect } from 'react'; const MyComponent = () => { const [count, setCount] = useState(0); const [message, setMessage] = useState(''); const handleClick = () => { setCount(prevCount => prevCount + 1); updateMessage(); }; const updateMessage = () => { // Simulating an async operation setTimeout(() => { setMessage(`Count is now ${count}`); }, 1000); }; useEffect(() => { console.log(message); }, [message]); return <button onClick={handleClick}>Increment</button>; }; export default MyComponent; ``` The expectation is that after clicking the button, after 1 second, the `message` state should update and the `useEffect` should fire, logging the new message. However, instead, I see that it logs the initial value (an empty string) even after the count has incremented. I thought that since `setMessage` is supposed to be asynchronous, it would capture the latest `count` state. I've also tried using the functional form of `setMessage`, like this: ```javascript setMessage(prevMessage => `Count is now ${count}`); ``` but it still logs the old value. Is there a better way to handle this situation? Am I misunderstanding how state updates work in React, especially in relation to closures? This is part of a larger application I'm building. What am I doing wrong? For context: I'm using Javascript on Ubuntu. Has anyone else encountered this?