React JS Quiz

Which operator is used for the ternary condition?*

• --

• ? :

• : :

• ? ?

What will the following code output?

console.log(2 + "2");

• 22

• Error

• "22"

• 4

Which method is used to loop through an array?*

• forEach()

• mapArray()

• loop()

• repeat()

Which hook is used to manage state in React functional components?*

• ReactState()

• setState()

• useState()

• useEffect()

What does CSS stand for?

• Creative Styling Sheets

• Cascading Style Sheets

• Colorful Style Syntax

• Computer Style Scripts

Which function is used to render the React app to the DOM?

• React.render()

• ReactApp()

• ReactDOM.createRoot()

• ppRender()

Which HTML tag is used to create a hyperlink?

• <href>

• <a>

• <link>

• <hyper>

What will this code do?

let i = 0;

while (i < 3)

{ console.log(i); i++; }

• Prints 1, 2, 3

• Error

• Infinite loop

• Prints 0, 1, 2

In which file is the main React component usually defined?

• style.css

• main.js

• index.html

• App.js

Which keyword is used to declare a variable in JavaScript?

• varname

• declare

• let

• define