NewFangled Vision Reactjs Developer Interview Questions, Process, and Tips for Freshers

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

A reducer is a pure function in React that takes the previous state and an action, and returns the new state.

• Reducers are used in React to manage state changes in an application

• They take the previous state and an action as input

• Reducers are pure functions, meaning they do not modify the state directly

• They return a new state based on the previous state and the action

• Redux is a popular library that uses reducers to manag

New features of HTML5 and CSS positions include flexbox, grid layout, and sticky positioning.

• Flexbox allows for easier alignment and distribution of items within a container.

• Grid layout enables the creation of complex layouts with rows and columns.

• Sticky positioning allows elements to stick to a specific position on the page as the user scrolls.

Spread operator is used to expand an iterable object into individual elements.

• Used for passing props to child components

• Used for merging arrays and objects

• Syntax: ...

• Example: const arr = [1, 2, 3]; const newArr = [...arr, 4, 5];

To make a page responsive, use Bootstrap layouts and alerts.

• Use Bootstrap's grid system to create responsive layouts

• Use media queries to adjust the layout based on screen size

• Use Bootstrap's responsive utility classes to hide/show elements on different devices

• Use Bootstrap's responsive navigation components for mobile-friendly menus

• Use Bootstrap's responsive images to ensure they scale properly

• Use Bootstrap's responsiv...read more