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JavaScript Function Performance implementing Large Arrays in React 18

πŸ‘€ Views: 0 πŸ’¬ Answers: 1 πŸ“… Created: 2025-08-21
react performance javascript optimization JavaScript

I'm following best practices but I need some guidance on I tried several approaches but none seem to work..... I'm working on a personal project and I'm experiencing important performance optimization when using a function to filter large arrays in my React 18 application. I'm utilizing a functional component that takes a large dataset (around 10,000 objects) and applies a filter based on user input. However, as the dataset grows, the filtering takes noticeably longer, and the UI becomes unresponsive. Here’s a simplified version of my code: ```javascript import React, { useState } from 'react'; const DataList = ({ data }) => { const [filter, setFilter] = useState(''); const handleFilterChange = (event) => { setFilter(event.target.value); }; const filteredData = data.filter(item => item.name.toLowerCase().includes(filter.toLowerCase()) ); return ( <div> <input type='text' onChange={handleFilterChange} /> <ul> {filteredData.map(item => <li key={item.id}>{item.name}</li>)} </ul> </div> ); }; ``` I’ve also tried using `React.memo` to optimize rendering, but it hasn't made a substantial difference. I'm aware that functions like `.filter()` create new arrays, which could lead to additional memory consumption, but I’m not sure how to efficiently handle large datasets without degrading performance. Is there a more performant way to implement filtering in this scenario? Any suggestions or best practices would be greatly appreciated! For context: I'm using Javascript on macOS. What am I doing wrong? Has anyone else encountered this? This is my first time working with Javascript 3.9. Thanks for any help you can provide! Has anyone else encountered this?