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ReactJS
1 follower study24x7 23 Apr 2024 11:44 AM study24x7 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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    ReactJS
    1 follower study24x7 22 Apr 2024 10:51 AM study24x7 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
    1 follower study24x7 22 Apr 2024 10:50 AM study24x7 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 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
    1 follower study24x7 22 Apr 2024 10:48 AM study24x7 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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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