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⇱ Quiz about React.js Quiz | Set-3

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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

There are 15 questions to complete.

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