React.js Quiz | Set-3

Question 1

What is the output of the below code snippets ?

import React from \'react\';
import ReactDOM from \'react-dom\';
const Component=()=>
{
        return <h1>This is Quiz Portal</h1>
}
 
ReactDOM.render(
    <Component />,
    document.getElementById("root")
);

• Component
• This is Quiz Portal
• Error in code
• None of the above

Question 2

Which of the below expression is required to write the JSX ?

• {}
• []
• ""
• ()

Question 3

Which of the following is used to make data in-class components ?

• componentWillMount
• constructor
• componentDidMount
• componentWillReceiveProps

Question 4

What is the following is the use of ref in React.js ?

• for direct access to the DOM node
• for reference to another JS file
• for bind the function
• for calling a function

Question 5

Which of the following is a way for webpack command to do in React.js?

• Transpiles all of the javaScript into one
• local development server
• A and B are true
• None of the above

Question 6

Which of the following is needed to change the code for compilation?

class date extends React.Component {
 render() {
   return <h1>Todays Date is :  {this.props.date}</h1>;
 }
}

• Remove this
• Capitalize date
• Remove the render
• The return value

Question 7

What is the correct way to set the default value for uncontrolled components ?

• Value property
• DefaultValue property
• Default property
• Assigns automatically

Question 8

What happens when a property is assigned to a method ?

• get()
• destructor()
• constructor()
• init()

Question 9

Which of the following react components act like function with respect to props ?

• Recursive functions
• Monads
• Pure functions
• Higher-order functions

Question 10

Which of the following is true about the catch the JavaScript error ?

• error helpers
• error catchers
• error bosses
• error boundaries