import React, { useMemo, useState } from 'react'; const data = Array.from({ length: 120 }, (_, i) => ({ id: i + 1, title: 'Question ' + (i + 1) })); export default function App() { const [q, setQ] = useState(''); const [count, setCount] = useState(0); const filtered = useMemo(() => { const query = q.trim().toLowerCase(); if (!query) return data; return data.filter((x) => x.title.toLowerCase().includes(query)); }, [q]); return ( <div style={{ padding: 16, width: 520 }}> <h2 style={{ marginTop: 0 }}>meetcode list</h2> <input value={q} onChange={(e) => setQ(e.target.value)} placeholder='Filter' style={{ width: '100%', padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb' }} /> <button type='button' onClick={() => setCount((n) => n + 1)} style={{ marginTop: 10, padding: '8px 12px', borderRadius: 12, border: 0, background: '#0b5', color: '#fff' }}>Re-render ({count})</button> <div style={{ marginTop: 10, color: '#555' }}>Showing {filtered.length} items</div> <ul style={{ marginTop: 10, paddingLeft: 18, maxHeight: 220, overflow: 'auto', border: '1px solid #eee', borderRadius: 14, padding: 12 }}> {filtered.slice(0, 30).map((x) => <li key={x.id}>{x.title}</li>)} </ul> </div> ); }