Extramarks Education React Js Frontend Developer Interview Questions and Answers

Lazy loading is a design pattern that delays loading resources until they are needed, improving performance and user experience.

• Improves initial load time by loading components only when they are needed.

• Implemented in React using React.lazy() and Suspense.

• Example: const LazyComponent = React.lazy(() => import('./LazyComponent'));

• Helps in reducing the bundle size by splitting code into smaller chunks.

• Can be used for ...read more

Denouncing refers to publicly declaring something as wrong or evil.

• Denouncing is the act of condemning or criticizing something publicly.

• It is often done to express disapproval or to call attention to a wrongdoing.

• Examples include denouncing acts of violence, discrimination, or corruption.

• Denouncing can also be used in political contexts to criticize policies or actions of a government.

Redux state can be cleaned by dispatching an action to reset the state to its initial values.

• Dispatching an action with type 'RESET_STATE'

• Updating the reducer to return the initial state when 'RESET_STATE' action is dispatched

Netflix uses a content delivery network (CDN) to efficiently load videos based on user location and network conditions.

• Netflix uses a distributed network of servers to store and deliver video content closer to users for faster loading times.

• Content is cached on servers located in various regions to reduce latency and improve streaming quality.

• Netflix employs adaptive bitrate streaming to adjust video quality based on a...read more

To download a large CSV file (>1000mb) and show the data while downloading, use streaming and pagination techniques.

• Implement streaming to download the file in chunks instead of all at once.

• Use pagination to display the downloaded data in parts as it is being downloaded.

• Consider using libraries like PapaParse for parsing CSV data efficiently.

• Show a progress bar or indicator to inform the user about the download status.