WellDoc Interview Questions, Process, and Tips

Virtual DOM is a lightweight copy of the actual DOM in memory, used for efficient updates in web development.

• Virtual DOM is a concept in React where a lightweight copy of the actual DOM is kept in memory.

• Changes are first made to the Virtual DOM, then compared with the actual DOM to minimize updates.

• This approach improves performance by reducing the number of direct manipulations to the actual DOM.

Optimizing front end code involves minimizing file sizes, reducing HTTP requests, using efficient algorithms, and implementing lazy loading.

• Minimize file sizes by removing unnecessary code, compressing images, and using minification tools like UglifyJS.

• Reduce HTTP requests by combining CSS and JavaScript files, using sprites for images, and implementing caching strategies.

• Use efficient algorithms and data structures to...read more

useEffect is used in React to perform side effects in function components. Implement search feature by using useEffect to update search results.

• useEffect is used to perform side effects in function components, such as data fetching, subscriptions, or manually changing the DOM.

• To implement search feature, you can use useEffect to update search results whenever the search query changes.

• Example: useEffect(() => { // co

ADF activities include data movement, data transformation, control flow, and data integration.

• Data movement activities: Copy data from source to destination (e.g. Copy Data activity)

• Data transformation activities: Transform data using mapping data flows (e.g. Data Flow activity)

• Control flow activities: Control the flow of data within pipelines (e.g. If Condition activity)

• Data integration activities: Combine data from d