Master SkillsBuild FutureLevel Up Fast

// Async data fetching
const fetchData = async (url) => {
  try {
    const response = await fetch(url);
    return await response.json();
  } catch (error) {
    console.error('Fetch failed:', error);
  }
};

// Custom debounce hook
const useDebounce = (value, delay) => {
  const [debouncedValue, setDebouncedValue] = 
    useState(value);
  
  useEffect(() => {
    const handler = setTimeout(() => {
      setDebouncedValue(value);
    }, delay);
    return () => clearTimeout(handler);
  }, [value, delay]);
  
  return debouncedValue;
};

-- Optimized join query
SELECT u.name, s.score, c.title
FROM users u
INNER JOIN scores s ON s.user_id = u.id
INNER JOIN courses c ON c.id = s.course_id
WHERE s.score > 80
ORDER BY s.score DESC
LIMIT 10;