Introduction to React: Building Dynamic User Interfaces

Introduction to React: Building Dynamic User Interfaces

Quick Summary: Dive into the fundamentals of React in 'Building Dynamic User Interfaces.' This article introduces the core concepts, guiding you through the journey of creating interactive and responsive web applications using one of the most powerful JavaScript libraries for UI development.


Facebook created the JavaScript library React, which has revolutionized the way developers create dynamic user interfaces for websites. React has grown to become a standard in modern web development. After its release in 2013, React gained a lot of traction thanks to its efficient rendering capabilities, component-based architecture, and declarative syntax. We'll dive into the essential ideas of React in this, examining its guiding principles and how it makes it easier to create scalable and interactive web applications.

What is ReactJS?

An open-source JavaScript library called ReactJS is used to efficiently and declaratively create user interfaces. It is a front-end library that is component-based and solely in charge of the view layer in an MVC architecture. React facilitates the creation of reusable UI components that show dynamic data and is used to create modular user interfaces.


Concept of ReactJS

Suppose a friend of yours shared a picture on Facebook. If you enjoyed the picture and then decided to read the comments as well. Even without reloading the page, you can see that the number of likes on the picture has increased by 100 as you browse through the comments. ReactJS is responsible for this amazing change in the count.

Reason to choose ReactJS

The declarative paradigm used by ReactJS enables applications to be both efficient and adaptable. Every state in your application is given a basic view, and when your data changes, it quickly updates and renders the appropriate component. The declarative view improves predictability and debugging ease of your code.

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History of ReactJS

It was discovered by a group of Facebook developers that DOM is slow when developing client-side applications. React was created by implementing a virtual DOM, which is essentially a JavaScript representation of a DOM tree, to make it faster. ReactJS was first released on May 29, 2013, and its most recent stable version, 18.2.0, was released on June 14, 2022.

How Does ReactJS work?

React updates the browser's DOM by creating a virtual DOM in memory. The browser's DOM will be updated as efficiently as possible by the virtual DOM. React elements are cheap to create and simple objects, in contrast to browser DOM elements. The DOM is updated to match the React elements by React DOM.



Use Cases

One button, a few sections of an interface, or the whole user interface of an app can all be handled by React. React is not as simple to "drop into" an application as a library like jQuery or even a framework like Vue, despite the fact that it can be used for small interface components. When you use React to build your entire app, it becomes more approachable.


Jordan Walke of Facebook developed the open-source JavaScript library ReactJS to create user interfaces for web and mobile applications. 2011 saw the debut of React on Facebook's newsfeed. It was used on Instagram in 2012 and released to the public in 2013.


React makes use of JSX, an HTML-in-JavaScript syntax. Here is an illustration of a simple JSX element:                         

This JSX would not be visible because it needs to be rendered by our application using ReactDOM.render(). JSX is a simpler way to use the function React.createElement(). In other words, the following two lines in React are the same: 

The browser cannot understand JSX. In order for the browser to understand it, it must be compiled to plain JavaScript. Babel is the most widely used compiler for JSX.


React is not a framework, nor is it limited to the internet. It renders to specific environments by combining it with other libraries. React Native, for example, can be used to create mobile applications. React and ReactDOM work together to create web applications.


React's main objective is to reduce the number of bugs that arise during the UI development process. It accomplishes this by using components, which are logical, self-contained code segments that specify specific areas of the user interface. Here's an illustration of a basic React component:



Front-end development has undergone a significant transformation thanks to ReactJS, which has given programmers a strong and adaptable toolkit for creating cutting-edge user interfaces. Its virtual DOM, JSX syntax, component-based architecture, and hook introduction make it an effective and adaptable library for developing dynamic web applications. These fundamental ideas will provide you with a strong basis for understanding the nuances of this extensively used library as you dive into React development.

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Simran Sharma

Simran Sharma

A software engineer driven by a passion for innovation. My journey with a strong foundation in computer science has honed my problem-solving skills and ignited an unwavering dedication to cutting-edge technology. I consistently deliver precision, teamwork, and on-time project completion. I’m not just an engineer but a tech enthusiast committed to driving progress.