React Hooks and HOCs Fundamentals
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Questions and Answers

Which of the following is NOT a benefit of using Redux?

  • Handling global state
  • Simplifying component logic (correct)
  • Improving predictability
  • Managing complex data flow

    • React Context is primarily designed for sibling communication.

    False (B)

    What does 'prop drilling' refer to in React?

    Prop drilling is the practice of passing props through multiple levels of components to reach a component that needs the data. This can lead to complex and inefficient code.

    A custom hook is a reusable function that contains ____ logic to extract common behavior.

    <p>hook</p> Signup and view all the answers

    Match the following terms with their corresponding descriptions:

    <p>Code Splitting = Loading components dynamically Virtual DOM = An in-memory representation of the real DOM Server-Side Rendering (SSR) = Rendering the application on the server Client-Side Rendering (CSR) = Rendering the application on the browser</p> Signup and view all the answers

    Which React Hook is primarily used for managing component state?

    <p><code>useState</code> (C)</p> Signup and view all the answers

    An empty dependency array in useEffect causes the effect to run only once after the component mounts.

    <p>True (A)</p> Signup and view all the answers

    What do Higher Order Components (HOCs) primarily take as input?

    <p>A component</p> Signup and view all the answers

    The component_____ lifecycle method runs after a component is mounted in the DOM.

    <p>DidMount</p> Signup and view all the answers

    What is a primary use case for Higher Order Components (HOCs)?

    <p>Adding common features or logic to multiple components. (D)</p> Signup and view all the answers

    Props drilling refers to the process of passing data directly to a component from React's Context.

    <p>False (B)</p> Signup and view all the answers

    Which lifecycle method is called right before a component is about to be removed from the DOM?

    <p>componentWillUnmount</p> Signup and view all the answers

    Match each React Hook to its primary purpose:

    <p><code>useContext</code> = Accessing data from React Context <code>useReducer</code> = Managing complex state updates <code>useMemo</code> = Memoizing expensive calculations <code>useRef</code> = Accessing DOM elements directly</p> Signup and view all the answers

    What is the primary goal of accessibility in design?

    <p>To ensure usability for everyone, regardless of abilities (C)</p> Signup and view all the answers

    Demonstrating knowledge of accessibility can positively influence interviewers.

    <p>True (A)</p> Signup and view all the answers

    What does RBAC stand for?

    <p>Role-Based Access Control</p> Signup and view all the answers

    The web accessibility guidelines to ensure applications are inclusive are known as _____

    <p>WCAG</p> Signup and view all the answers

    Match the following concepts with their definitions:

    <p>Routing Library = A library for managing application navigation Protected Routes = Routes restricted by user authentication Query Params = Parameters passed within URLs Dynamic Routing = Routing that adapts to changing data</p> Signup and view all the answers

    Flashcards

    Accessibility

    Designing applications to be usable by everyone, regardless of abilities.

    Brownie Points

    Demonstrating accessibility knowledge can impress interviewers.

    RBAC

    Role-Based Access Control allows restricting access based on user's roles.

    Dynamic Routing

    Building routes that adapt to changing data such as user IDs.

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    Security Best Practices

    Learn about common security vulnerabilities and how to mitigate them.

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    useState

    A React hook for managing component state.

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    useEffect

    A hook for handling side effects in functional components.

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    Dependency Array

    An array that determines when useEffect runs.

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    Higher Order Components (HOCs)

    Functions that take a component and return an enhanced one.

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    Mounting Phase

    The lifecycle phase when a component is added to the DOM.

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    componentDidMount

    Method that runs after a component is mounted.

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    Props Drilling

    The technique of passing data through props in a hierarchy.

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    useContext

    A hook for accessing data from React Context.

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    React Context

    A method to share data across components without prop drilling.

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    Sibling Communication

    Passing data between sibling components sharing the same parent.

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    Redux

    A library for state management in large applications.

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    Redux Toolkit (RTK)

    A tool that simplifies Redux development.

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    Custom Hooks

    Reusable functions that encapsulate hook logic for shared behavior.

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    Lazy Loading

    Performance optimization technique that loads code on demand.

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    Virtual DOM

    An in-memory representation of the real DOM for efficient updates.

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    Server-Side Rendering (SSR)

    Initial rendering of the application is done on the server.

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    Asynchronous Tasks

    Actions that don't happen immediately, like API calls.

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    Promises

    Objects that represent the eventual outcome of an async operation.

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    Testing

    Ensures code quality through various tests.

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    Unit Tests

    Tests individual functions or components for correctness.

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    Reusability

    Designing components to be used in multiple places.

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    Performance Optimization

    Improving application performance through various techniques.

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    CSS Frameworks

    Libraries like Bootstrap and Tailwind for styling applications.

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    Study Notes

    React Hooks

    • Essential for React development.
    • useState: Manages component state.
    • useEffect: Handles side effects.
      • Dependency array: Crucial for controlling when effects run.
        • Empty array: Effect runs only once on mount.
        • Non-empty array: Effect runs when array values change.
    • Other Important Hooks:
      • useContext: Accesses data from React Context.
      • useReducer: Manages complex state updates.
      • useMemo: Memoizes expensive calculations.
      • useCallback: Memoizes callback functions for performance.
      • useRef: Accesses DOM elements directly.

    Higher Order Components (HOCs)

    • Functions that take a component and return an enhanced one.
    • Purpose: Code reuse, adding functionality without original component changes.
    • Use cases: Adding common features or logic to multiple components.
    • Implementation: Wraps the component's render function.
    • Importance: Impress interviewers by using HOCs in machine coding rounds.

    Component Lifecycle Methods

    • Focus on Class Components (though less common).
    • Three Phases:
      • Mounting: Component added to the DOM.
      • Updating: Component receives prop or state changes.
      • Unmounting: Component removed from the DOM.
    • Key Methods:
      • Mounting:
        • componentDidMount: Runs after mount.
        • componentWillMount: Rarely used.
      • Updating:
        • componentDidUpdate: Runs after update.
      • Unmounting:
        • componentWillUnmount: Runs before unmount.
    • Order of Execution: Understand the order of method calls.

    State Management

    • Props and State: Crucial for data flow.
    • Props Drilling: Passing data down hierarchies, potentially cumbersome.
    • React Context: Shares data across components without prop drilling.
    • Sibling Communication: Passing data between siblings.
    • Redux: Popular state management library for large apps.
      • Use cases: Global state, complex data flow, predictably.
      • Redux Toolkit (RTK): Simplifies Redux.
      • Zustand: Simpler, newer state management library.
      • Understanding: Knowing how these libraries work is beneficial, even if not extensively used.

    Custom Hooks

    • Definition: Reusable functions containing hook logic.
    • Advantages: Reusability, maintainability, readability, and testability.
    • Examples: useLocalStorage.
    • When to Use: For sharing complex logic across components.
    • Code: Need to write custom hooks.

    Advanced Topics

    • Lazy Loading (Code Splitting): Performance technique.
      • Benefits: Faster initial load times.
      • Techniques: import() (dynamic import), Suspense, Code Splitting (by bundlers), Code chunking.
    • Virtual DOM: Key concept.
      • Benefits: Efficient DOM updates with in-memory representation.
      • Components: Reconciliation Algorithm, React Fiber, Diffing Algorithm.
    • SSR (Server-Side Rendering) & CSR (Client-Side Rendering): Performance considerations.
      • SSR: Server renders application initially, improves SEO and initial load.
      • CSR: Browser renders application, often better for complex interactions.
      • Comparison: Understanding pros and cons of each approach.
      • SEO: Both impact SEO, especially for single-page applications.
    • Testing: Ensures code quality.
      • Benefits: Early bug detection, maintainable code, confidence.
      • Types: Unit, Integration, and End-to-End tests.

    Asynchronous Tasks

    • Definition: Non-immediate actions (API calls, timers, user events).
    • Key Concepts:
      • Promises: Represent asynchronous results.
        • Callbacks: Functions triggered on asynchronous completion.
      • useEffect: Manage asynchronous operations.
      • API Calls (fetch, Axios): Fetch data from APIs.
      • Timers (setTimeout, setInterval): Delay or repeat code.
      • Events: Handle user interactions (clicks, scrolls).

    Reusability, Modularity, Testability, Readability

    • Coding Practices: Important for robust and maintainable applications.
      • Modularity: Divide code into reusable components.
      • Reusability: Design components for use in other parts.
      • Testability: Ensure easy testing.
      • Readability: Clear and understandable code.
      • Component Size: Maintain component files under 150-200 lines.

    Performance Optimization

    • Essential for senior engineers.
    • Key Areas:
      • Lazy Loading: Load code and assets when needed.
        • Benefits: Faster initial load, better experience.
      • Asset Optimization: Reduce asset sizes (images, JavaScript, CSS).
        • Tools: Optimizers, bundlers, minifiers.
        • Bundlers: Help optimize code using tools like Webpack.
      • Server Optimization: Enhance server performance with caching, CDNs, server-side rendering.
      • Code Optimization: Write efficient code, minimize DOM manipulations, and optimize rendering.
        • Shimmer UI: Indicator for loading.

    Styling

    • Techniques:
      • Inline Styles: Apply styles within JSX.
      • CSS: Separate CSS files.
      • SCSS/SASS: CSS pre-processors, add features like nesting.
      • CSS Frameworks: Tailwind CSS, Bootstrap, Material-UI, Ant Design, Stylex (CSS-in-JS).
    • Pros and Cons: Choose styling method based on project needs.
    • Importance: Design round prep, understand styling decisions.

    Accessibility

    • Designing inclusive applications.
    • Importance: Welcoming experience for all users.
    • Brownie Points: Demonstrating accessibility knowledge.
    • Best Practices: Follow WCAG (web accessibility guidelines).
    • Tools: Use accessibility testing tools.

    Additional Key Concepts

    • RBAC (Role-Based Access Control): Control access based on roles.
    • Routing Library: React Router, handles navigation.
      • Protected Routes: Restrict routes based on authentication
      • Dynamic Routing: Responsive routes.
      • Query Params: URL data.
    • Security: Protect application against vulnerabilities.
      • Best Practices: Learn about and avoid common vulnerabilities.

    Overall Notes

    • Study Depth: Go beyond surface-level understanding.
    • Industry Standards: Master industry coding practices.
    • Practice: Improve interview confidence through practice.
    • Confidence: Project confidence in your knowledge.
    • Additional Resources: Utilize various resources to deepen understanding.
    • Reward: Celebrate learning through practice challenges and online communities.

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    Quiz Team

    Description

    Explore the essential concepts of React Hooks and Higher Order Components (HOCs) in this quiz. Dive into core hooks like useState and useEffect, and learn about their significance in managing state and side effects. Understand the implications and benefits of using HOCs for enhancing component functionality.

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