React 18: Issues with Component Re-renders When Using useCallback with useEffect
I'm learning this framework and I'm having trouble with component re-renders in my React 18 application... I'm using `useCallback` to memoize a function that's passed down as a prop, and I have an accompanying `useEffect` that listens for changes in the prop data. However, I'm noticing that my component re-renders more often than expected when the prop changes, even when the function itself isn't supposed to change. Here's a simplified version of my code: ```javascript import React, { useState, useCallback, useEffect } from 'react'; const ParentComponent = () => { const [data, setData] = useState([]); const fetchData = useCallback(async () => { const response = await fetch('https://api.example.com/data'); const result = await response.json(); setData(result); }, []); useEffect(() => { fetchData(); }, [fetchData]); return <ChildComponent data={data} />; }; const ChildComponent = React.memo(({ data }) => { console.log('ChildComponent rendered'); return <div>{data.length} items</div>; }); ``` In this example, `ChildComponent` is wrapped with `React.memo`, which should prevent unnecessary re-renders, but I still see 'ChildComponent rendered' in the console log every time `fetchData()` is called. I expected it not to re-render when the data doesn't change. I've tried removing `fetchData` from the dependency array in `useEffect`, but that led to stale data being used. I also experimented with using `React.useRef` to keep track of previous data, but it didn't resolve the issue. What could be causing the `ChildComponent` to re-render even with `React.memo` applied? Is there a better way to manage this pattern to avoid unnecessary renders? Any suggestions would be greatly appreciated! Is there a better approach?