1.  What are the two ways to handle data in React?

2. Which is not true about Virtual DOM in React JS?

3. Why React is faster then normal websites?

4. As soon as the state of react component is changed, component will

5. How can you optimize performance for a function component that always renders the same way?

6. . What is [e.target.id] called in this code snippet?

  const handleChange = (e) => {
  setState((prevState) => ({ ...prevState, [e.target.id]: e.target.value }));
}

7. Consider the following code from React Router. What do you call :id in the path prop? > Route path=”/:id” / >

8. What is the output of the below code ?

var Geeks=(props)=>
{
 return(
 

DSA Course 1
 

 

DSA Course 2
 

 );
}
ReactDOM.render( < DSA Course/ > ,mountNode)

9. Which of the following function is used to change the state of the React.js component?

10. Which of the following is NOT a rule for React Hooks?

11. What will be the output of the following code?

import React, { Component } from 'react';  
const App = () => {  
    
      return(  
          < div >  
             < h1 className = "hello" > {25+20}< /h1 >   
          < /div >  
      );   
}  
export default App;

12. What is the use of “webpack” command in React.js?

13. Which operator can be used to conditionally render a React component?

14. What is the children prop?

15. What is React.js?