👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-11

reactjs useeffect memoization javascript

I'm stuck on something that should probably be simple. I just started working with I'm stuck trying to I'm working with an scenario with `useEffect` not being triggered when a prop changes in my React 18 application. I have a child component that receives a prop, and I also have a memoized callback using `useCallback` to handle some logic. The question is that the `useEffect` that depends on this prop does not get executed when the prop changes. Here's a simplified version of my code: ```javascript import React, { useEffect, useCallback } from 'react'; const ChildComponent = React.memo(({ value, onValueChange }) => { console.log('Child component rendered'); return <div>{value}</div>; }); const ParentComponent = () => { const [count, setCount] = React.useState(0); const handleValueChange = useCallback(() => { setCount(prev => prev + 1); }, []); useEffect(() => { console.log('useEffect triggered'); // Perform some action based on value change }, [count]); // Dependency on count return ( <div> <ChildComponent value={count} onValueChange={handleValueChange} /> <button onClick={handleValueChange}>Increment</button> </div> ); }; export default ParentComponent; ``` In this setup, I expect the `useEffect` in the `ParentComponent` to trigger whenever `count` changes, but it seems to skip the execution if the `ChildComponent` doesn't re-render. I've confirmed that the prop `value` does change. I've also tried adding the `onValueChange` function as a dependency to the `useEffect`, but that leads to infinite re-renders. I'm wondering if this is a known scenario with memoization or if I'm missing something in my implementation. Any insights would be greatly appreciated! For context: I'm using Javascript on Ubuntu. Thanks in advance! I've been using Javascript for about a year now. Is there a simpler solution I'm overlooking? This is for a microservice running on Windows 11. The project is a application built with Javascript. Has anyone else encountered this?