Which of the following is a typical use case for using Render Props in React applications?

  • Code sharing between unrelated components.
  • Component styling with CSS.
  • Data fetching and state management.
  • Routing in React applications.
Render Props are often used for data fetching and state management in React applications. They allow components to provide data or functionality to their children, making them a suitable choice for scenarios where components need to share data or behavior without being tightly coupled. They are not typically used for unrelated code sharing, styling, or routing.

Which of the following hooks is used to manage local state in functional components?

  • componentDidMount
  • this.state
  • useEffect
  • useState
useState is the React hook used to manage local state in functional components. It allows functional components to maintain their state without using class components. useEffect is used for side effects and lifecycle methods like componentDidMount are used in class components, not functional ones. this.state is used in class components but not with hooks.

In styled-components, to create global styles that apply across your entire application, you'd use the ______ component.

  • StyleProvider
  • GlobalStyles
  • CSSInjector
  • GlobalProvider
In styled-components, the component used to create global styles that apply across the entire application is called "GlobalStyles." This allows you to define styles that affect all components in your application, making it a powerful tool for maintaining a consistent look and feel. Other options are not typically used for this purpose in styled-components.

While splitting code with Webpack, you notice that two routes share a significant amount of code. How can you ensure that the shared code is not loaded multiple times for users?

  • Combine the code for both routes into a single file.
  • Implement server-side rendering to avoid code duplication.
  • Load the shared code using a CDN for faster delivery.
  • Use Webpack's code splitting with dynamic imports to create a shared bundle.
To prevent shared code from being loaded multiple times, you should use Webpack's code splitting with dynamic imports to create a shared bundle. This ensures that the shared code is loaded once and reused across routes as needed. Combining code into a single file doesn't achieve code separation and may result in larger bundles. Loading via CDN and server-side rendering address different issues.

How do immutable data structures help in optimizing React component re-renders?

  • They allow components to change state directly.
  • They enforce state immutability.
  • They make components re-render more frequently.
  • They slow down the rendering process.
Immutable data structures enforce state immutability, meaning once a state is set, it cannot be changed directly. This helps optimize React component re-renders because React can efficiently detect if the state has changed by comparing references, reducing unnecessary re-renders. Changing state directly (Option 1) is against React best practices and can lead to rendering issues.

When implementing lazy loading with React.lazy() and Suspense, what is a potential concern regarding user experience?

  • Delayed rendering of components, leading to potential UI glitches and perceived performance issues.
  • Improved user experience due to faster page loads.
  • Increased initial load time due to fetching of all lazy-loaded components upfront.
  • Reduced code maintainability due to code splitting.
When using React.lazy() and Suspense for lazy loading, a potential concern is delayed rendering of components. As components are loaded only when needed, there might be a delay in rendering, leading to potential UI glitches and perceived performance issues. This can impact the user experience negatively. It's important to manage this concern when implementing lazy loading in React.

You are building a React application that needs to work offline. Which technology would you leverage to allow the app to function without an internet connection?

  • GraphQL
  • REST APIs
  • Service Workers
  • WebSockets
To make a React application work offline, you would leverage Service Workers. Service Workers enable caching of assets and allow the app to function without an internet connection by serving cached content when offline. WebSockets, REST APIs, and GraphQL are not primarily designed for offline functionality but rather for real-time communication and data retrieval.

What is a potential downside or limitation of the current React diffing algorithm?

  • It can lead to excessive virtual DOM updates in some cases.
  • It cannot handle component state changes effectively.
  • It is not compatible with modern JavaScript features.
  • It relies too heavily on manual key assignments.
One potential downside of the current React diffing algorithm is that it can lead to excessive virtual DOM updates in some cases. If component updates are frequent or the tree structure is complex, React may perform more updates than necessary, affecting performance. Developers need to be mindful of optimizing their components and key assignments to mitigate this limitation and improve React app performance.

Stateless components in React are also known as ________ components.

  • Pure Components
  • Functional Components
  • Dynamic Components
  • Class Components
Stateless components in React are also known as Functional Components. These components are defined as JavaScript functions and do not have internal state management. They receive props and render content based on those props. The other options do not accurately describe stateless components.

One common use case for using React Portals is rendering modals outside the main application DOM hierarchy.

  • Dropdowns
  • Modals
  • Popovers
  • Portals
React Portals are commonly used to render modals outside the main DOM hierarchy. This is especially useful for rendering elements like modals, which need to float above the main application content but may have complex structures.