React 18: guide with Memoization Causing Unwanted Prop Updates in Child Component
I'm prototyping a solution and I just started working with After trying multiple solutions online, I still can't figure this out. I've looked through the documentation and I'm still confused about I've been working on a React 18 application and encountered an scenario with prop updates in a child component, which seems to be caused by memoization. I have a parent component that fetches user data and passes it down to a child component. However, I am experiencing unwanted re-renders in the child component, even though I use `React.memo` and `useCallback`. Here's the relevant code snippet: ```javascript import React, { useCallback, useEffect, useState } from 'react'; const UserList = React.memo(({ users }) => { console.log('Child component rendered'); return <ul>{users.map(user => <li key={user.id}>{user.name}</li>)}</ul>; }); const ParentComponent = () => { const [users, setUsers] = useState([]); const [loading, setLoading] = useState(true); const fetchUsers = useCallback(async () => { const response = await fetch('https://api.example.com/users'); const data = await response.json(); setUsers(data); setLoading(false); }, []); useEffect(() => { fetchUsers(); }, [fetchUsers]); if (loading) return <div>Loading...</div>; return <UserList users={users} />; }; ``` The child component `UserList` should only re-render when the `users` array changes. However, I notice that even minor updates in the parent component, like a state toggle for loading, cause it to re-render. I confirmed that the `users` array does not change during these updates. When I log in the `UserList`, it shows that the component renders unexpectedly. I've tried using `React.memo` with a custom equality function, but it still leads to re-renders. Additionally, I also considered using a separate state for the loading state but that didn’t solve the question either. Can anyone shed light on why the child component is re-rendering despite `React.memo`? Is there a way to ensure that it only updates when the actual `users` data changes? My development environment is Ubuntu. Thanks in advance! Thanks in advance! I'm using Javascript 3.9 in this project. I'm working in a CentOS environment. Any ideas how to fix this?