React useCallback Hook MCQ useCallback Practice Questions

Direction: Choose the correct option

What is the useCallback hook used for?

A. To create refs

B. To memoize functions so they are not recreated on every render

C. To handle side effects

D. To memoize values

Direction: Choose the correct option

How is useCallback different from useMemo?

A. They are the same

B. useCallback is for state

C. useMemo is for functions

D. useCallback memoizes functions, useMemo memoizes values

Direction: Choose the correct option

Why would you use useCallback?

A. To prevent unnecessary re-renders of child components that rely on function props

B. To optimize expensive calculations

C. To handle events

D. To update state

Direction: Choose the correct option

What does useCallback return?

A. A ref

B. The memoized function

C. The memoized value

D. A new function each time

Direction: Choose the correct option

Which dependency array is correct for useCallback to ensure the callback always uses the latest state?

A. No dependencies

B. Include only functions

C. Empty array

D. Include all state/props that the callback uses

Quipoin Menu