ReactJS Quiz

Which of the following is used in React.js to increase performance?

• Virtual DOM

• Original DOM

• Both A and B

• None of the above

In which language is React.js written?

• Python

• Javascript

• Java

• Vite

How many elements can a valid react component return?

• 1

• 2

• 3

• 4

Which of the following function is used to change the state of react component?

• setState()

• state()

• setChangeState()

• None of the above

Total ways of defining variables in ES6 is?

• 1

• 2

• 3

• 4

JSX stands for

• Javascript XML

• JSON XML

• JSON

• Javascript and AngularJS

Choose the functionality of setState?

• Access the previous state before the setState operation.

• invoke code after the setState  operation is done

• replace this date completely instead of the default merge action

• none of the above

React is a

• JavaScript framework

• JavaScript library

• both  a and b

• none of the above

Does React.js create a VIRTUAL DOM in the memory?

• 1. TRUE

• 1. FALSE

• 1. Can be true or false

• 1. Cannot say

What is the naming convention for the component "expenseitem" in ReactJS?

• ExpenseItem

• Expenseitem

• expenseitem

• EXPENSEITEM