Summary - Advanced custom hooks

Combine useFetch with useDebounce to write a search box.

Summary - Advanced custom hooks

In this group we wrote three powerful custom hooks: useLocalStorage for persistent state, useFetch for data fetching, and useDebounce for slowing changes. All three are daily tools in real projects.

The common principle: hooks combine state and effect, pull complex logic out of components, and form testable, reusable pieces. Composable structures can be built by nesting hooks.

In the next step you'll write a data page with useFetch; you'll handle loading and error states.

Exercise DataPage with useFetch

Complete the skeleton. Write a DataPage component. Call useFetch("https://api.example.com/items"); destructure as [data, loading, error]. If loading, show Loading; if error, show Error; otherwise { '{ data.length }' } items. Export it.

Show example solution

function DataPage() {
  const [data, loading, error] = useFetch("https://api.example.com/items");
  if (loading) return <p>Loading</p>;
  if (error) return <p>Error</p>;
  return <p>{data.length} items</p>;
}

export default DataPage;

Test yourself

Which hook is ideal for a search box?
- useDebounce
- usePrevious
- useToggle
- useCounter
Show answer

useDebounce — useDebounce is ideal for search boxes.
Match the three hooks

useLocalStorage

Persistent
useFetch

Data
useDebounce

Delay
useEffect

Side effect

Next lesson: Context separation

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies