React useEffect not firing on specific prop change in functional component
I'm performance testing and I'm confused about I'm writing unit tests and I'm deploying to production and Quick question that's been bugging me - I'm working on a React functional component that fetches data based on a prop called `categoryId`. I want to trigger a fetch operation whenever `categoryId` changes, but I'm noticing that the `useEffect` hook isn't firing as expected in some cases. I'm using React 17.0.2 and the `categoryId` prop is coming from the parent component. Here’s a simplified version of my code: ```javascript import React, { useEffect, useState } from 'react'; const DataFetcher = ({ categoryId }) => { const [data, setData] = useState(null); useEffect(() => { const fetchData = async () => { const response = await fetch(`https://api.example.com/data/${categoryId}`); const json = await response.json(); setData(json); }; fetchData(); }, [categoryId]); return <div>{data ? JSON.stringify(data) : 'Loading...'}</div>; }; ``` The problem arises when I change the `categoryId` prop in the parent component. Sometimes the fetch doesn't trigger, and I end up with stale data. I'm logging `categoryId` inside the `useEffect`, and it shows the correct value, but the effect doesn't seem to run. I even tried adding a console log before the fetch to confirm the function execution, but it appears that it’s not running in those instances. I also checked whether the parent component is correctly providing a new reference for `categoryId`, and it indeed is changing as expected. I’ve tried using a key prop with a new value too, but that didn’t help. I’m really puzzled about why the `useEffect` isn’t responding in certain scenarios. Any insights would be greatly appreciated! For context: I'm using Javascript on Linux. How would you solve this? Is there a simpler solution I'm overlooking? This is my first time working with Javascript 3.11. Thanks for your help in advance! Could this be a known issue? I recently upgraded to Javascript stable. Am I approaching this the right way?