useDeferredValue Search
ReactJS
Hard
6 views
Problem Description
Use useDeferredValue to keep typing smooth during heavy filtering.
Output Format
Render a React component.
Constraints
Filter a big list using deferred query and show immediate input value.
Official Solution
import React, { useDeferredValue, useMemo, useState } from 'react';
const base = Array.from({ length: 2000 }, (_, i) => ({ id: i + 1, title: 'meetcode item ' + (i + 1) }));
export default function App() {
const [query, setQuery] = useState('');
const deferred = useDeferredValue(query);
const filtered = useMemo(() => {
const q = deferred.trim().toLowerCase();
if (!q) return base;
return base.filter((x) => x.title.includes(q));
}, [deferred]);
return (
<div style={{ padding: 16, width: 560 }}>
<h2 style={{ marginTop: 0 }}>Deferred search</h2>
<input value={query} onChange={(e) => setQuery(e.target.value)} placeholder='Search...' style={{ width: '100%', padding: '10px 12px', borderRadius: 12, border: '1px solid #bbb' }} />
<div style={{ marginTop: 10, color: '#555' }}>Typing: {query} | Filtering by: {deferred}</div>
<div style={{ marginTop: 12, border: '1px solid #eee', borderRadius: 14, padding: 12, height: 220, overflow: 'auto' }}>
{filtered.slice(0, 60).map((x) => <div key={x.id}>{x.title}</div>)}
</div>
</div>
);
}
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