React Hooks Introducing React Hooks 5

Question 1

Which Hook is an alternative to useState for complex state logic?

Accepted Answer

useReducer

Answer

useEffect

Answer

useRef

Answer

useId

Question 2

What does useRef primarily return?

Accepted Answer

A mutable object whose .current persists across renders

Answer

A re-rendering state value

Answer

A memoized callback

Answer

A context value

Question 3

What is the main purpose of the useMemo Hook?

Accepted Answer

To memoize an expensive computed value

Answer

To perform side effects

Answer

To store DOM references

Answer

To dispatch actions

Question 4

How does useCallback differ from useMemo?

Accepted Answer

useCallback memoizes a function, useMemo memoizes a value

Answer

They are identical

Answer

useCallback runs effects

Answer

useCallback reads context

Question 5

Why are dependency arrays important in Hooks like useEffect and useMemo?

Accepted Answer

They tell React when to re-run or recompute

Answer

They define styling rules

Answer

They set the initial state

Answer

They register event listeners globally

Question 6

What is a key benefit of extracting logic into a custom Hook?

Accepted Answer

Reuses stateful logic across components without duplication

Answer

Forces use of class components

Answer

Eliminates the need for state

Answer

Disables re-rendering

Question 7

Which Hook lets you customize the instance value exposed when using a ref with forwardRef?

Accepted Answer

useImperativeHandle

Answer

useLayoutEffect

Answer

useDebugValue

Answer

useTransition