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React.js Quiz

Authored by Gnaneshwar Reddy

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React.js Quiz
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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is React.js?

A library for building user interfaces

A backend framework

A database management system

A CSS preprocessor

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of JSX in React?

A JavaScript framework

A syntax extension that allows writing HTML inside JavaScript

A tool for testing React applications

A server-side rendering tool

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method is used to update the state in a React component?

setState()

getState()

changeState()

updateState()

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which hook is used to manage side effects in functional components?

useState

useEffect

useRef

useContext

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the default behavior of the setState() method?

It updates the state synchronously

It replaces the entire state

It merges the new state with the old state

It does not affect the state

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does 'lifting state up' refer to in React?

Passing the state down through props

Moving the state to a common parent component

Deleting state from a component

Moving state from a parent component to a child component

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the key prop help with in lists of elements in React?

Ensuring each element is unique

Optimizing rendering performance

Handling asynchronous updates

Preventing re-renders

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