React Questions

1. How do you fix the syntax error that results from running this code?

const person =(firstName, lastName) =>
{
  first: firstName,
  last: lastName
}
console.log(person("Jill", "Wilson"))

2. How do you set a default value for an uncontrolled form field?

3. Using object literal enhancement, you can put values back into an object. When you log person to the console, what is the output?

const name = 'Rachel';
const age = 31;
const person = { name, age };
console.log(person);

4. When rendering a list using the JavaScript map() method, what is required for each element rendered?

5.  What is the use of React hooks?

6. Which attribute is React’s replacement for using innerHTML in the browser DOM?

7. What is a react.js in MVC?

8.  To create a constant in JavaScript, which keyword do you use?

9. 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;

10. Find the bug in this code :

  function car({make, model}) {
  return < h1 > {make} {model} < /h1 > ;
}; 

11. What is the purpose of useEffect hook in React?

12. React component names must begin with an uppercase letter.

13. What is the correct syntax to import a Component from React?

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

15.  Which of the following is method is not a part of ReactDOM?