EMS Group Reactjs Developer Interview Questions and Answers

A reusable React form component that dynamically generates fields and displays inputs in a table format.

• Use React's state to manage form data dynamically.

• Utilize a mapping function to render form fields based on an array of field definitions.

• Implement a submit handler to process the form data.

• Display the form inputs in a table format using HTML table elements.

• Example of field definitions: [{ label: 'Name', type: 'text'...read more

React 16 introduced new features like React Fiber, Error Boundaries, Portals, and improved server-side rendering.

• React Fiber is a new reconciliation engine that improves performance and enables incremental rendering.

• Error Boundaries allow developers to catch and handle errors in components.

• Portals provide a way to render children into a different DOM subtree.

• Improved server-side rendering with support for streaming and...read more

React hooks simplify state management and lifecycle methods in functional components.

• Hooks allow functional components to have state and lifecycle methods

• They reduce the need for class components and HOCs

• Hooks make code more readable and easier to test

• Examples of hooks include useState, useEffect, and useContext

HOC components are higher-order components in React that allow code reuse and logic sharing.

• HOC components are functions that take a component and return a new component with additional functionality.

• They are used to abstract common logic and behaviors into reusable components.

• HOC components can be used for tasks like authentication, logging, and code reuse.

• Example: a withAuth HOC component that adds authentication log...read more