Lesson 2 of 3 · 11 min

State & interactivity

useState gives a component memory: const [count, setCount] = useState(0).

Calling the setter re-renders the component with the new value — never mutate state directly.

Practice

Build a counter with a button that increases the number each click.

Optional resources

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Follow the official component and state tutorials.

Free documentation.

Prototype React components in the browser.

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