ReactJS - Study24x7

ReactJS

1 follower study24x7

23 Apr 2024 11:44 AM study24x7

What are React Hooks Rules of Hooks, and why is it important to follow them?

A

They are guidelines for writing performant code

B

Rules that enforce proper handling of asynchronous operations

C

Guidelines for using hooks like useState and useEffect to ensure they are called in the correct order and only in functional components

D

Rules that dictate the usage of hooks in class components

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Chirag Singhal

Opt c

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Reply 23 Apr 2024 05:19 PM

ReactJS

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22 Apr 2024 10:51 AM study24x7

Describe the concept of code splitting in React and its benefits.

A

Breaking the code into smaller, manageable pieces to improve maintainability

B

Dynamically loading only the necessary parts of the application, reducing initial load times

C

Using higher-order components to modularize code

D

Improving code readability through proper indentation and naming conventions

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ReactJS

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22 Apr 2024 10:50 AM study24x7

How does React handle and optimize the rendering of lists of dynamic data?

A

By using the map function exclusively

B

Utilizing the shouldComponentUpdate method

C

Through the use of the key prop to uniquely identify list items

D

By relying on the Virtual DOM to automatically optimize list rendering

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ReactJS

1 follower study24x7

22 Apr 2024 10:49 AM study24x7

What is the significance of React's context API, and in what scenarios would you prefer using it?

A

Context API is used for creating global variables accessible throughout the application

B

It facilitates the sharing of state between components without prop drilling

C

Context API is exclusively for managing component styling

D

It is used for handling asynchronous operations in functional components

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ReactJS

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22 Apr 2024 10:48 AM study24x7

Explain the concept of "lifting state up" in React and provide an example scenario where it's beneficial.

A

Moving state management to the top-level component for sharing state between sibling components

B

Elevating components within the component hierarchy

C

Enhancing the performance of a specific component

D

Utilizing context API for managing global state

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ReactJS

1 follower study24x7

22 Apr 2024 10:47 AM study24x7

What is the role of the useRef hook in React, and in what scenarios is it commonly used?

A

Managing component state in functional components

B

Creating references to DOM elements and persisting values between renders

C

Handling asynchronous operations with ease

D

Facilitating client-side routing

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ReactJS

1 follower study24x7

19 Apr 2024 11:41 AM study24x7

How does server-side rendering (SSR) benefit React applications, and what challenges does it address?

A

Improves initial page load performance and SEO, mitigates the "flash of unstyled content" (FOUC) issue

B

Enhances client-side routing efficiency

C

Accelerates the execution of asynchronous operations

D

Facilitates better component styling

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ReactJS

1 follower study24x7

19 Apr 2024 11:40 AM study24x7

What is the significance of React Hooks like useImperativeHandle and useLayoutEffect?

A

Managing component layout and rendering

B

Synchronizing imperative code with React state

C

Creating custom render methods for components

D

Optimizing performance for asynchronous tasks

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ReactJS

1 follower study24x7

19 Apr 2024 11:39 AM study24x7

Explain the concept of Higher-Order Components (HOCs) in React.

A

Components that render other components

B

Components that receive and return other components

C

Components used for handling state in functional components

D

Components responsible for server-side rendering

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ReactJS

1 follower study24x7

19 Apr 2024 11:38 AM study24x7

What is the purpose of the useCallback hook in React?

A

Optimizing performance by memoizing callback functions

B

Managing global state in functional components

C

Creating reusable custom hooks

D

Handling asynchronous operations in components

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ReactJS

1 follower study24x7

19 Apr 2024 11:35 AM study24x7

What is the purpose of React Hooks like useReducer and useContext?

A

To manage component styling

B

To facilitate client-side routing

C

To handle complex state logic in functional components

D

To manage asynchronous operations

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ReactJS

1 follower study24x7

18 Apr 2024 10:30 AM study24x7

How does error boundaries work in React?

A

They prevent all errors in the application

B

They catch JavaScript errors anywhere in the component tree and log those errors

C

They only work with class components

D

They handle only asynchronous errors

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ReactJS

1 follower study24x7

18 Apr 2024 10:29 AM study24x7

What is the purpose of the useMemo hook in React?

A

Memoizing function results for performance optimization

B

Managing component side effects

C

Handling global state

D

Creating memoized components

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ReactJS

1 follower study24x7

18 Apr 2024 10:27 AM study24x7

How does React handle forms, and what is controlled components?

A

React forms use traditional HTML form handling

B

Controlled components are components that manage their own state

C

React forms use one-way data binding

D

Controlled components are components whose form elements are controlled by React state

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ReactJS

1 follower study24x7

18 Apr 2024 10:26 AM study24x7

What is the significance of the React.Fragment in React?

A

A state management library

B

A wrapper for functional components

C

A placeholder for async operations

D

A wrapper to group multiple elements without adding an extra node to the DOM

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ReactJS

1 follower study24x7

18 Apr 2024 10:25 AM study24x7

What is the purpose of the map function in React when rendering lists of components?

A

Styling list items

B

Iterating over array elements and rendering components

C

Sorting array elements

D

Filtering array elements

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ReactJS

1 follower study24x7

17 Apr 2024 10:30 AM study24x7

What is Redux used for in a React application?

A

Styling and theming

B

Managing component state

C

Handling asynchronous operations

D

State management in a predictable way

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ReactJS

1 follower study24x7

17 Apr 2024 10:25 AM study24x7

How does React Router help in navigation within a React application?

A

By creating hyperlinks between components

B

Enabling server-side rendering

C

Facilitating client-side routing

D

Managing global state

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ReactJS

1 follower study24x7

17 Apr 2024 10:11 AM study24x7

In React, what is the key role of the shouldComponentUpdate lifecycle method?

A

Handling component initialization

B

Controlling whether a component should re-render

C

Managing asynchronous operations

D

Defining default props

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ReactJS

1 follower study24x7

17 Apr 2024 10:09 AM study24x7

What is the purpose of the useEffect hook in React?

A

Managing component state

B

Performing side effects in functional components

C

Handling HTTP requests

D

Controlling rendering logic

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