useDebounce Hook

import { useState, useEffect } from 'react';

function useDebounce<T>(value: T, delay: number = 300): T {
  const [debounced, setDebounced] = useState<T>(value);

  useEffect(() => {
    const timer = setTimeout(() => setDebounced(value), delay);
    return () => clearTimeout(timer);
  }, [value, delay]);

  return debounced;
}

// Usage
function SearchInput() {
  const [query, setQuery] = useState('');
  const debouncedQuery = useDebounce(query, 400);

  useEffect(() => {
    if (debouncedQuery) fetchResults(debouncedQuery);
  }, [debouncedQuery]);

  return <input value={query} onChange={(e) => setQuery(e.target.value)} />;
}