Quiz

React Advanced

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Quiz

Question 1

What is the main purpose of memoization in React?

A

To store data permanently in local storage

B

To improve performance by caching expensive calculations and preventing unnecessary re-renders

C

To convert functional components into class components

D

To add animations to React components

Question 2

What does React.Memo do?

A

Creates a reference to a DOM element

B

Manages side effects in functional components

C

Memoizes the result of an expensive computation

D

Prevents re-renders of a component if its props have not changed

Question 3

In the following code, when will the expensiveCalculation function run? const result = useMemo(() => expensiveCalculation(value), [value]);

A

On every render of the component

B

Only once when the component mounts

C

Only when value changes

D

Every time a user clicks anywhere on the page

Question 4

Which of the following best describes the difference between useMemo and React.memo?

A

useMemo is used for side effects, while React.memo is used for state management

B

useMemo is used in class components, while React.memo is for functional components

C

useMemo memoizes values, while React.memo memoizes entire components

D

useMemo and React.memo are identical and interchangeable

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