👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-05

react performance array filter javascript

I'm not sure how to approach I'm sure I'm missing something obvious here, but I'm stuck trying to I'm stuck on something that should probably be simple..... I'm sure I'm missing something obvious here, but I'm working on a React application where I need to filter a large array of objects based on multiple conditions, but I'm running into performance issues and unexpected results... The array consists of user objects, each containing properties like `id`, `name`, `age`, and `status`. My goal is to filter these users based on their `age` and `status` fields. Here's what I initially tried: ```javascript const users = [ { id: 1, name: 'Alice', age: 25, status: 'active' }, { id: 2, name: 'Bob', age: 30, status: 'inactive' }, { id: 3, name: 'Charlie', age: 35, status: 'active' }, // ... (many more users) ]; const filterUsers = (users, ageThreshold, status) => { return users.filter(user => user.age > ageThreshold && user.status === status); }; const filteredUsers = filterUsers(users, 28, 'active'); console.log(filteredUsers); ``` However, when I run this code, I notice that it takes too long to filter, especially when the `users` array has over 10,000 entries. Additionally, the `filteredUsers` array sometimes includes users that don't meet the specified conditions, which is quite puzzling. I've tried using `useMemo` from React to memoize the results, but the performance improvement wasn't significant. Here's an example of how I attempted to implement that: ```javascript import React, { useMemo } from 'react'; const UserList = ({ users }) => { const ageThreshold = 28; const status = 'active'; const filteredUsers = useMemo(() => { return users.filter(user => user.age > ageThreshold && user.status === status); }, [users, ageThreshold, status]); return ( <ul> {filteredUsers.map(user => <li key={user.id}>{user.name}</li>)} </ul> ); }; ``` Despite using `useMemo`, the filtering seems inconsistent, and I still notice performance lags. I'm worried that the filtering logic might be too naive given the size of the dataset. Is there a better approach or best practice for handling this in React? Should I consider using a library for more efficient data handling, or is there something I am missing in my current implementation? Has anyone else encountered this? I'm working on a web app that needs to handle this. Am I missing something obvious? What are your experiences with this? For context: I'm using Javascript on macOS. Any suggestions would be helpful. I'm on Windows 11 using the latest version of Javascript. What would be the recommended way to handle this? I've been using Javascript for about a year now. Is there a simpler solution I'm overlooking?