React useEffect not executing on component update when state is derived from props
I'm deploying to production and I'm getting frustrated with I've searched everywhere and can't find a clear answer. I'm stuck on something that should probably be simple... I'm encountering an issue with the `useEffect` hook in React (v17.0.2). I have a component where I'm trying to run a side effect whenever a derived state changes, but it seems like the effect is not firing as expected. Here's a simplified version of my component: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = ({ items }) => { const [filteredItems, setFilteredItems] = useState([]); useEffect(() => { const newItems = items.filter(item => item.active); setFilteredItems(newItems); }, [items]); useEffect(() => { if (filteredItems.length > 0) { console.log('Filtered items updated:', filteredItems); } }, [filteredItems]); return <div>{filteredItems.map(item => <div key={item.id}>{item.name}</div>)}</div>; }; ``` The first `useEffect` runs correctly and updates `filteredItems` when `items` changes. However, the second `useEffect`, which is supposed to log to the console whenever `filteredItems` changes, only runs once after the initial render. I even tried adding a console log directly within the first `useEffect` to ensure the filtered array is indeed being updated, and it logs correctly. Despite this, the second effect does not fire on subsequent updates. I tried switching the dependency array in the second `useEffect` to include both `items` and `filteredItems`, but that didn't resolve the issue. Could this be a closure issue, or am I missing something fundamental regarding state updates in React? Any insights would be greatly appreciated! I'm working on a CLI tool that needs to handle this. I'm working on a web app that needs to handle this. Has anyone else encountered this? For context: I'm using Javascript on Windows 11. Any examples would be super helpful. I'm developing on Windows 11 with Javascript. Am I missing something obvious?