👀 Views: 1 💬 Answers: 1 📅 Created: 2025-06-06

reactjs usestate usereducer state-management javascript

I'm working with an scenario where my component's state resets unexpectedly when using `useReducer` to manage a nested object structure. I'm working with React version 17.0.2 and I've implemented a solution that should theoretically work, but it seems to lose state during certain updates. Here's the reducer function I’m using: ```javascript const initialState = { user: { name: '', email: '', preferences: { theme: 'light', notifications: true } } }; function reducer(state, action) { switch (action.type) { case 'UPDATE_NAME': return { ...state, user: { ...state.user, name: action.payload } }; case 'TOGGLE_NOTIFICATIONS': return { ...state, user: { ...state.user, preferences: { ...state.user.preferences, notifications: !state.user.preferences.notifications } } }; default: return state; } } ``` I'm dispatching actions like this: ```javascript const [state, dispatch] = useReducer(reducer, initialState); const handleNameChange = (e) => { dispatch({ type: 'UPDATE_NAME', payload: e.target.value }); }; const handleToggleNotifications = () => { dispatch({ type: 'TOGGLE_NOTIFICATIONS' }); }; ``` The question arises when I call `handleNameChange`. After updating the name, the entire `preferences` object seems to revert to its initial state, even though I am correctly copying over the existing state. I added some console logs to trace the state after each dispatch, and I noticed that the `user.preferences` gets reset to default. It looks like the state is not persistently holding onto the nested values, but I need to figure out where the state mutation is happening. What could be causing this behavior? Is there a common pitfall with `useReducer` that I might be overlooking? Any insights would be appreciated! For context: I'm using Javascript on Windows.