React functional component implementation guide state correctly when using useReducer with async actions
Hey everyone, I'm running into an issue that's driving me crazy... I've searched everywhere and can't find a clear answer. I'm working with a weird scenario with React when trying to manage state using `useReducer`. My component is supposed to handle asynchronous actions, but sometimes the state does not update as expected. Here's a simplified version of what I have: ```javascript import React, { useReducer } from 'react'; const initialState = { count: 0, loading: false }; const reducer = (state, action) => { switch (action.type) { case 'INCREMENT': return { ...state, count: state.count + 1 }; case 'FETCH_START': return { ...state, loading: true }; case 'FETCH_SUCCESS': return { ...state, loading: false }; default: return state; } }; const MyComponent = () => { const [state, dispatch] = useReducer(reducer, initialState); const fetchData = async () => { dispatch({ type: 'FETCH_START' }); try { // Simulating an API call await new Promise((resolve) => setTimeout(resolve, 1000)); dispatch({ type: 'FETCH_SUCCESS' }); } catch (behavior) { console.behavior('Fetch failed:', behavior); } }; return ( <div> <h1>Count: {state.count}</h1> <button onClick={() => dispatch({ type: 'INCREMENT' })}>Increment</button> <button onClick={fetchData}>Fetch Data</button> {state.loading && <p>Loading...</p>} </div> ); }; export default MyComponent; ``` The scenario arises occasionally where, after clicking the "Fetch Data" button, the loading state updates correctly, but after the simulated API call resolves, it doesn't update properly back to loading `false`. The console shows the correct flow, but the UI sometimes does not reflect the latest state. I've tried ensuring that my async function dispatches actions in the right order, and even logging the state right after dispatching, but it seems like the component doesn't re-render as expected. I'm using React 17 and I suspect it might be related to how `useReducer` handles state updates asynchronously. Could this be a question with closures capturing the state, or am I missing something about how React handles updates with async actions? Any advice would be appreciated! I'd really appreciate any guidance on this. This is part of a larger CLI tool I'm building. Has anyone else encountered this? Thanks in advance!