HCL Group UI Developer Interview Questions, Process, and Tips

React virtual DOM is a lightweight copy of the actual DOM, which allows React to efficiently update and render components.

• React creates a virtual DOM tree that mirrors the actual DOM.

• When changes occur, React compares the virtual DOM with the previous version to identify the minimal updates needed.

• React then updates the virtual DOM and efficiently applies the changes to the actual DOM.

• This process helps in optimizing p...read more

Redux is a predictable state container for JavaScript apps. Flow is a static type checker for JavaScript.

• Redux is a state management library for JavaScript applications.

• It helps in managing the state of an application in a predictable way.

• It follows a unidirectional data flow pattern.

• Flow is a static type checker for JavaScript that helps in catching errors before runtime.

• It helps in improving the quality of code and r

Unit testing is a software testing technique where individual units or components of a software application are tested in isolation from the rest of the application.

• Unit testing is done to ensure that each unit of the software application is working as expected.

• It helps in identifying and fixing bugs early in the development cycle.

• Unit tests are automated and can be run frequently to ensure that changes made to the cod...read more

Routing in React is the process of navigating between different components or pages based on the URL.

• React Router is a popular library for handling routing in React

• It allows for declarative routing with components and URLs

• Routes can be defined with parameters and nested routes

• Navigation can be done with Link and NavLink components

• Programmatic navigation can be done with the useHistory hook