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ReactJS - How to manage nested state updates in a complex object without mutating state?

👀 Views: 34 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-06
reactjs useState state-management javascript

I'm stuck trying to Quick question that's been bugging me - I'm working on a React application where I need to manage the state of a complex object that contains nested properties..... I'm using the `useState` hook to manage the state, but I'm running into issues when trying to update a nested property without mutating the original state object. My state structure looks something like this: ```javascript const [formData, setFormData] = useState({ user: { name: '', email: '' }, preferences: { notifications: true, theme: 'light' } }); ``` I have a form that allows users to update their name and email, as well as toggle their notification preference. When I try to update just the username, I'm using the following approach: ```javascript const handleNameChange = (e) => { setFormData({ ...formData, user: { ...formData.user, name: e.target.value } }); }; ``` However, it seems like the state is not updating correctly, and I'm getting the following warning in the console: ``` Warning: Maximum update depth exceeded. This can happen when a component repeatedly calls setState inside componentWillUpdate or render. ``` I've confirmed that the `handleNameChange` function is not being called in a loop, but it feels like my state update logic is causing unnecessary re-renders. I've also tried using `useReducer` to manage the state, but I ended up with even more complexity. Is there a better way to handle nested updates in React state without running into these issues? Any insights or best practices would be greatly appreciated. This is part of a larger web app I'm building. Any ideas what could be causing this? Thanks in advance! Has anyone dealt with something similar? For context: I'm using Javascript on Linux. Could someone point me to the right documentation?