State is data that changes over time. When state changes, React re-renders the component to reflect the new data.
How useState Works
const [count, setCount] = useState(0);
// ^ ^ ^
// value setter fn initial value
useState returns an array: [currentValue, setterFunction]- Calling the setter triggers a re-render
- Never modify state directly — always use the setter
Your Task
Build a counter component:
- Initialize a
count state to 0 using useState
- Display the count in an
<h2> with id "count"
- Add an Increment button (id:
"increment") that increases count by 1
- Add a Decrement button (id:
"decrement") that decreases count by 1
- Add a Reset button (id:
"reset") that sets count back to 0