Category: ReactJS Interview Question

• The CSS module file is created with the .module.css extension
• The CSS inside a module file is available only for the component that imported it, so there are no naming conflicts while styling the components.

These are all the basic to advanced ReactJS interview questions that are frequently asked in interviews. We hope these ReactJS interview questions will be helpful in clearing your interview round. All the best for your upcoming job interview! Suppose you want to learn more about ReactJS components, I suggest you click here!

Choose The Right Software Development Program

This table compares various courses offered by Simplilearn, based on several key features and details. The table provides an overview of the courses’ duration, skills you will learn, additional benefits, among other important factors, to help learners make an informed decision about which course best suits their needs.

Program Name	Full Stack Java Developer	Automation Testing Masters Program
Geo	IN	All
University	Simplilearn	Simplilearn
Course Duration	6 Months	11 Months
Coding Experience Required	Basic Knowledge	Basic Knowledge
Skills You Will Learn	15+ Skills Including Core Java, SQL, AWS, ReactJS, etc.	Java, AWS, API Testing, TDD, etc.
Additional Benefits	Interview Preparation Exclusive Job Portal 200+ Hiring Partners	Structured Guidance Learn From Experts Hands-on Training
Cost	$$	$$
	Explore Program	Explore Program

There are several ways in which we can style React components:

• Inline Styling

• JavaScript Object

• CSS Stylesheet

We can implement routing in our React application using this method:

Considering we have the components App, About, and Contact in our application:

Hope you have no doubts about this ReactJS interview questions article, in case of any difficulty, please leave your problems in the section below.

SN	React Routing	Conventional routing
1.	Single HTML page	Each view is a new HTML file
2.	The user navigates multiple views in the same file	The user navigates multiple files for each view
3.	The page does not refresh since it is a single file	The page refreshes every time user navigates
4.	Improved performance	Slower performance

• It maintains consistent structure and behavior and is used to develop single-page web applications. 
• Enables multiple views in a single application by defining multiple routes in the React application.

React Router is a routing library built on top of React, which is used to create routes in a React application. This is one of the most frequently asked react interview questions.

SN	Redux	Flux
1.	Redux is an open-source JavaScript library used to manage application State	Flux is an architecture and not a framework or library
2.	Store’s state is immutable	Store’s state is mutable
3.	Can only have a single-store	Can have multiple stores
4.	Uses the concept of reducer	Uses the concept of the dispatcher

• Flux is the application architecture that Facebook uses for building web applications. It is a method of handling complex data inside a client-side application and manages how data flows in a React application.

• There is a single source of data (the store) and triggering certain actions is the only way way to update them.The actions call the dispatcher, and then the store is triggered and updated with their own data accordingly.

• When a dispatch has been triggered, and the store updates, it will emit a change event that the views can rerender accordingly.

• Store: Holds the state of the application.
• Action: The source information for the store.
• Reducer: Specifies how the application’s state changes in response to actions sent to the store.

Redux is an open-source, JavaScript library used to manage the application state. React uses Redux to build the user interface. It is a predictable state container for JavaScript applications and is used for the entire application’s state management.