QUIZ ON : react - MISCELLANEOUS

MISCELLANEOUS

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Question No# : 01 out of 50

We can update the state in React.js by calling to setState() method. These calls are:

A. Synchronous in nature.

B. Asynchronous in nature.

C. Are asynchronous but can be made synchronous when required.

D. None of the above.

Question No# : 02 out of 50

Choose the library which is most often associated with react?

A. Sinon

B. Chai

C. Jest

D. Mocha

Question No# : 03 out of 50

What is the purpose of React's "render props" pattern?

A. It is a technique to render HTML elements in React components

B. It is a way to pass a function as a prop to a component for rendering dynamic content

C. It is a method to define the initial state of a component

D. It is a way to handle user interactions in React components

Question No# : 04 out of 50

What is the purpose of React's "key" prop when rendering a list of elements?

A. It determines the order in which the list items are rendered

B. It ensures unique styling for each list item

C. It improves the performance of rendering the list

D. It helps React identify which items have changed, been added, or been removed

Question No# : 05 out of 50

What is the purpose of the React Developer Tools extension?

A. It allows developers to inspect the component hierarchy and state in a React application

B. It provides a code editor specifically designed for writing React components

C. It enables real-time collaboration among multiple developers working on a React project

D. It automatically generates documentation for React components

Question No# : 06 out of 50

React Lifecycle method static getDerivedSateFromProps(props , state) is called when ___

A. Component is created for the first time

B. State of the component is updated

C. Both A and B

D. None of the above

Question No# : 07 out of 50

Which method is used to change the state of a component in React?

A. setState()

B. changeState()

C. updateState()

D. modifyState()

Question No# : 08 out of 50

What is the purpose of React's "useCallback" hook?

A. It is used to create reusable custom hooks in React

B. It is used to handle user interactions in React components

C. It is used to handle form submissions in React components

D. It is used to memoize functions for performance optimization

Question No# : 09 out of 50

What can you use to handle code splitting?

A. React.split

B. React.lazy

C. React.memo

D. React.fallback

Question No# : 10 out of 50

What is React Hooks in React?

A. A way to create reusable logic in functional components

B. A replacement for class components in React

C. A mechanism to manage state and lifecycle in functional components

D. All of the above

Question No# : 11 out of 50

What is the concept of React portals?

A. It is a way to create reusable UI components in React

B. It is a mechanism to optimize rendering performance in React

C. It is a way to render React components outside of their parent component's DOM hierarchy

D. None of the above

Question No# : 12 out of 50

What is the purpose of React's "memo" function?

A. It is used to memoize function components for performance optimization

B. It is used to handle form validation in React components

C. It is used to create reusable custom hooks

D. It is used to define the structure and layout of a React component

Question No# : 13 out of 50

What is the purpose of React's "ErrorBoundary" component?

A. It is used to handle errors that occur during rendering or in lifecycle methods of React components

B. It is used to manage state in functional components

C. It is used to optimize the rendering performance of React components

D. It is used to handle form submissions in React components

Question No# : 14 out of 50

How can you handle forms in React?

A. By using the controlled component pattern

B. By using the uncontrolled component pattern

C. By using form libraries like Formik or React Hook Form

D. All of the above

Question No# : 15 out of 50

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

A. ReactDOM.destroy()

B. ReactDOM.hydrate()

C. ReactDOM.createPortal()

D. ReactDOM.findDOMNode()

Question No# : 16 out of 50

Which of the following terms commonly described react applications?

A. Imerative

B. Integrated

C. Declarative

D. closed

Question No# : 17 out of 50

What is the default port where web pack-server runs?

A. 8080

B. 6060

C. 3000

D. 3030

Question No# : 18 out of 50

What is the purpose of the "React.Fragment" component in React?

A. It is used to define the structure and layout of a React component

B. It is used to handle asynchronous operations and data fetching

C. It is used as a wrapper to render multiple elements without adding extra nodes to the DOM

D. None of the above

Question No# : 19 out of 50

What is the use of “web pack” command in React.js?

A. It is a module bundler

B. The “webpack” command is used to transpile all the JavaScript down into one file

C. It runs React local development server

D. None of the above

Question No# : 20 out of 50

What is React context used for?

A. To pass data to deeply nested components without explicit prop drilling

B. To manage the global state of a React application

C. To enable communication between sibling components

D. All of the above

Question No# : 21 out of 50

We can update the state in React.js by calling to setState() method. These calls are__________

A. Asynchronous in nature

B. Synchronous in nature

C. Are asynchronous but can be made synchronous when required

D. None of the these

Question No# : 22 out of 50

What is the purpose of state in React?

A. To store and manage data within a component

B. To define the structure of a React component

C. To handle user interactions in a component

D. To style the components

Question No# : 23 out of 50

Which of the following command is used to install create-react-app?

A. npm install -f create-react-app

B. npm install -g create-react-app

C. npm install create-react-app

D. install -g create-react-app

Question No# : 24 out of 50

What is the purpose of the "React.Children" API in React?

A. It provides utilities for working with React children components

B. It manages the lifecycle of React components

C. It handles form validation in React applications

D. It optimizes the rendering performance of React components

Question No# : 25 out of 50

In which of the following condition, the React.js Lifecycle method static get Derived Stae From Props(props, state) is called?

A. The state of the component is updated

B. The component is created for the first time

C. All of above

D. None

Question No# : 26 out of 50

What is JSX in React?

A. JavaScript XML

B. Java syntax extension

C. A templating language

D. None of the above

Question No# : 27 out of 50

In react, the key should be?

A. Unique among his siblings only

B. Unique in the DOM

C. Does not requires to be unique

D. all of the above

Question No# : 28 out of 50

Which company developed ReactJS?

A. Apple

B. Facebook

C. Google

D. Twitter

Question No# : 29 out of 50

What is the purpose of React's "getDerivedStateFromProps" lifecycle method?

A. It is used to handle form submissions in React components

B. It is used to manage state in functional components

C. It is used to update the state of a component based on changes in props

D. It is used to handle user interactions in React components

Question No# : 30 out of 50

In React, what is the purpose of the "setState" method?

A. To update the state of a component

B. To define the initial state of a component

C. To handle user interactions in a component

D. To render the component's UI

Question No# : 31 out of 50

What changes would appear in the component as soon as the state of the React component is changed?

A. It will re-render the component

B. It can be created again from scratch

C. It will do nothing; you have to call render method to render the component again

D. None

Question No# : 32 out of 50

In React, what is the purpose of the "defaultProps" property?

A. It specifies the default values for props in a component

B. It sets the initial state of a component

C. It defines the default styling for a component

D. It determines the default behavior of a component's lifecycle methods

Question No# : 33 out of 50

What is the concept of "lifting state up" in React?

A. Moving the state from a child component to its parent component

B. Moving the state from a parent component to its child component

C. Extracting the state into a separate utility function

D. Sharing the state between multiple unrelated components

Question No# : 34 out of 50

Choose the correct statement in the context of uncontrolled components in ReactJS?

A. source of truth can be anything

B. source of truth is a component state

C. source of truth is DOM

D. none of the above

Question No# : 35 out of 50

What is used to handle code-splitting?

A. React.lazy

B. React.memo

C. React.fallback

D. React.split

Question No# : 36 out of 50

What is the role of a reducer in React?

A. It defines the initial state of a component

B. It determines the rendering of a component

C. It specifies the action types for handling user interactions

D. It manages the state transitions of a component based on dispatched actions

Question No# : 37 out of 50

What is the lifecycle method used for initializing state and binding event handlers in React?

A. componentDidMount

B. componentDidUpdate

C. componentWillMount

D. constructor

Question No# : 38 out of 50

What is snapshot testing used for in react?

A. It allows us to test Javascript objects

B. It helps you write applications

C. It provides clear, enduring assertions

D. None of the above

Question No# : 39 out of 50

What is the purpose of the "useEffect" hook in React?

A. To handle form submissions in React components

B. To manage the lifecycle of functional components

C. To handle user interactions in React components

D. To create reusable logic in React components

Question No# : 40 out of 50

What is the purpose of React hooks like "useMemo" and "useCallback"?

A. To optimize the performance of functional components by memoizing values and functions

B. To manage the state of functional components

C. To handle side effects in functional components

D. None of the above

Question No# : 41 out of 50

What is the purpose of React's "StrictMode"?

A. To enforce strict code quality rules in React applications

B. To enable additional debugging checks and warnings in the development mode

C. To ensure compatibility with older versions of React

D. None of the above

Question No# : 42 out of 50

Why is the usage of set State?

A. Access the previous state before the set State operation

B. Replace the state completely instead of the default merge action

C. Invoke code after the set State operation is done

D. None

Question No# : 43 out of 50

What is the significance of the "key" prop in React lists?

A. It improves the performance of rendering lists

B. It ensures that the list items are displayed in alphabetical order

C. It uniquely identifies each element in a list, aiding in efficient updates

D. It controls the styling of list items

Question No# : 44 out of 50

In React, what is the purpose of the "shouldComponentUpdate" method?

A. To determine if a component should re-render or not

B. To handle asynchronous actions and side effects

C. To define the initial state of a component

D. To handle user interactions in a component

Question No# : 45 out of 50

How can you handle errors in React components?

A. By using the "try-catch" block in the component's render method

B. By using the "componentDidCatch" lifecycle method to catch and handle errors

C. By using global error handling provided by the browser

D. None of the above

Question No# : 46 out of 50

What is the purpose of the "React.StrictMode" component in React?

A. To enable additional debugging checks and warnings in the development mode

B. To enforce strict code quality rules in React applications

C. To ensure compatibility with older versions of React

D. To optimize rendering performance in React applications

Question No# : 47 out of 50

What is the difference between controlled and uncontrolled components in React?

A. Controlled components rely on state for managing their data, while uncontrolled components do not.

B. Controlled components allow user input to directly update the component's state, while uncontrolled components do not.

C. Controlled components are created using classes, while uncontrolled components are created using functions.

D. There is no difference; the terms are used interchangeably.

Question No# : 48 out of 50

What is the purpose of the "React.Fragment" shorthand syntax in React?

A. It is used to create a new React component

B. It is used to render multiple elements without adding extra nodes to the DOM

C. It is used to define the initial state of a component

D. It is used to manage the lifecycle of a component

Question No# : 49 out of 50

Why is useLayoutEffect used?

A. To complete the update

B. To optimize for all devices

C. To change the layout of the screen

D. when you need the browser to paint before the effectors

Question No# : 50 out of 50

How do you handle passing through the component tree without having to pass props down manually at every level?

A. React Send

B. React Pinpoint

C. React Router

D. React Context