React useEffect not triggering on dependency array change when handling complex objects
Can someone help me understand I'm facing an issue with a `useEffect` hook in my React application where I'm trying to respond to changes in a complex object, but it's not triggering as expected. I have the following setup: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState({ user: { name: 'John', age: 30 } }); useEffect(() => { console.log('Data changed:', data); // Perform some action based on the new data }, [data]); const updateUser = () => { // Trying to update user data setData({ user: { name: 'John', age: 31 } }); // This should trigger useEffect }; return ( <div> <p>Name: {data.user.name}</p> <p>Age: {data.user.age}</p> <button onClick={updateUser}>Update Age</button> </div> ); }; export default MyComponent; ``` When I click the "Update Age" button, I expect the `useEffect` hook to trigger and log the updated data. However, I only see the initial log "Data changed: { user: { name: 'John', age: 30 } }" in the console. The state is updating correctly, but `useEffect` isn't firing on subsequent updates. I've tried logging the `data` object directly to see its current state inside the `useEffect`, and it's correctly identifying the change, but the hook itself doesn't seem to be responding. Is there something I am missing when it comes to how `useEffect` handles changes to complex objects in its dependency array? Should I be using a different approach, like using a specific property of the object instead of the whole object for the dependency array? Any help would be appreciated! For context: I'm using Javascript on Ubuntu. What's the best practice here? The stack includes Javascript and several other technologies. Thanks for taking the time to read this!