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VOOZH | about |
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VOOZH | about |
Question 1
Which hook is preferred when state logic becomes complex or depends on previous state values?
useState
useReducer
useRef
useEffect
Question 2
Which of the following is the correct signature for using useReducer?
const [state, dispatch] = useReducer(reducer)
const [dispatch, state] = useReducer(reducer)
const [state, dispatch] = useReducer(state, action)
const [state, reducer] = useReducer(dispatch)
Question 3
What does useRef NOT do?
Persist values across renders.
Directly access DOM elements.
Trigger re-renders when updated.
Store previous values.
Question 4
In Component Composition, which pattern allows us to build reusable wrapper components?
Specialization
Containment (children props)
Higher-Order Components
Render Props
Question 5
What will be the updated state after dispatching { type: 'increment' }?
{ count: 0 }
{ count: 1 }
undefined
Error
Question 6
Which of the following is TRUE about Render Props?
They are a replacement for Hooks.
They allow passing a function as a prop for dynamic rendering.
They always require class components.
They cannot be used with state.
Question 7
What happens when this component mounts?
The input remains empty and unfocused
The input is pre-filled with "Hello React!" but not focused
The input is pre-filled with "Hello React!" and focused automatically
The code will throw an error
Question 8
What will the following code render?
Nothing will render
It will throw an error: text is undefined
It will render <p>Hello Composition!</p>
It will render only <Child /> without content
Question 9
Which pattern is demonstrated in the following code?
Compound component pattern.
Render props pattern.
Incorrect use of React hooks.
Code will cause an error.
Question 10
What is the difference between useRef and useState?
useRef triggers re-renders, while useState does not.
useState persists across renders, while useRef does not.
useState triggers re-renders when the state changes, while useRef does not
useState can only store numbers, while useRef can store any data type.
There are 10 questions to complete.
