async function fetchData() {
  try {
    const response = await fetch('/api/data');
    return await response.json();
  } catch (error) {
    console.error('Failed:', error);
    throw error;
  }
}

React

Custom React Hook

Reusable state management with localStorage

function useLocalStorage(key, initial) {
  const [value, setValue] = useState(() => {
    const stored = localStorage.getItem(key);
    return stored ? JSON.parse(stored) : initial;
  });

  useEffect(() => {
    localStorage.setItem(key, JSON.stringify(value));
  }, [key, value]);

  return [value, setValue];
}

JavaScript

Array Utilities

Functional programming helpers for arrays

const unique = arr => [...new Set(arr)];
const chunk = (arr, size) =>
  Array.from({ length: Math.ceil(arr.length / size) },
    (_, i) => arr.slice(i * size, i * size + size)
  );

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