CodexBloom - Programming Q&A Platform

React component not re-rendering after state update due to closures

👀 Views: 38 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-07
react state-management closures javascript

I've been struggling with this for a few days now and could really use some help... I'm not sure how to approach After trying multiple solutions online, I still can't figure this out... I'm working with an scenario where my React component doesn't seem to re-render after I've updated the state using a closure inside a loop. I'm using React 17.0.2 and my component looks something like this: ```javascript import React, { useState } from 'react'; const MyComponent = () => { const [items, setItems] = useState([1, 2, 3]); const updateItems = () => { for (let i = 0; i < items.length; i++) { // Using a closure to handle the state update setItems(prevItems => { const newItems = [...prevItems]; newItems[i] += 1; // Increment each item return newItems; }); } }; return ( <div> <button onClick={updateItems}>Update Items</button> <ul> {items.map(item => ( <li key={item}>{item}</li> ))} </ul> </div> ); }; export default MyComponent; ``` When I click the "Update Items" button, I expect all items in the list to increment by 1, but instead, I only see the first item being updated, and the others remain unchanged. I suspect that the closure captures the state at the time the `setItems` function is called, leading to unexpected behavior. I've tried using `setItems` with a functional update, but it doesn't seem to resolve the scenario. I've also checked for console errors, but all I see is a warning about multiple state updates being triggered in a single render. Any ideas on how I can ensure that all items are updated correctly in this scenario? My development environment is Ubuntu. Hoping someone can shed some light on this. I'd be grateful for any help. What are your experiences with this?