React Hooks Quiz III

Which Hook is used to store and update state in functional components?

• useState

• useEffect

• useRef

• useContext

What is the correct way to initialize state using useState?

• const [count, setCount] = useState(0);

• const count = useState(0);

• const [count] = useState(0);

• const [count, updateCount] = useState();

What will happen if useEffect is missing the dependency array?

• The effect will run after every render.

• The effect will never run.

• The effect will run only once.

• React will throw an error.

What is a common mistake when using useEffect with dependencies?

• Not including all necessary dependencies in the array.

• Using useEffect inside event handlers.

• Using useState inside useEffect.

• Calling setState directly inside the render function.

How can you clean up a side effect in useEffect?

• Return a cleanup function inside useEffect.

• Call useEffect twice.

• Use useMemo instead of useEffect.

• Set useEffect dependencies to null.

What is wrong with the following useState usage?

What is wrong with this useEffect implementation?

Find the mistake in this Custom Hook implementation: