React churls up cross-platform application development with its commoving UI’s on the web and ‘near-native’ effect by its native counterpart; let’s learn more!
React sweeps up rendering logic with UI logic, handling events, changing states and preparing data for display. React separates concerns instead of artificially separating technologies by putting mark-up and logic in separate files, and loosely couples all “components”. JSX is not mandatory, but it helps as a visual aid, working besides UI within JavaScript code. It facilitates error handling. With that out of the way, you can embed expressions, specify attributes, specify children, prevent injection attacks, and represent objects with JSX.
What should you know to get started?
With a bit of understanding of core Java, Spring Boot, Servlet, Filter, XML, and JavaScript React.JS framework can easily be assimilated into start-up and enterprise application development.
As we scope the use cases and applications of React, JSX is one of the syntax extensions to Javascript. It is used along with React to describe what the UI should look like. It fosters template language, produces react “elements”, and renders them to DOM.
Popular React Application
Metaverse is a collective project that leverages immersive learning, responsible innovation, inclusivity, transparency, empowerment, and accesses technologies, and unlocks opportunities as learners, creators, and developers to build a 3D space to let you socialize, learn, collaborate and play in ways that go beyond what we can imagine. React.JS empowers Metaverse.
React JS with Spring Boot 2.2
Enterprise Java developers use Spring Boot 2.2 and React JS to develop backend RESTful applications using Spring Boot 2.2 and frontend applications using the React JS framework.
To start using Spring Boot 2.2, customize auto-configuration, configure data and CRUD operations, create REST APIs with Spring, secure REST APIs, test Spring Boot Application, create and style React components, consume REST API with React JS, deploy and containerize application.
React JS with TypeScript
TypeScript supports JSX and models patterns used in React codebases like ‘useState’. Next.js and Gatsby also support React in the way TypeScript does. Typescript is a superset of JavaScript and it is not comparable to JSX.
React.jsx is the same as React.js with an upgraded extension. It makes us easier to differentiate between XML, HTML, and JS. TypeScript adds more functionality to plain JavaScript. JSX version is React is better known to compile to vanilla Javascript. It assists in static type checking in case of larger projects, better IntelliSense, debugging support, interoperability amongst JavaScript to TypeScript with renaming from .js to .ts.
React.js and React Native
React.js is an open-source JavaScript-based library for building user interfaces for single-page applications. It handles the view layer for web and mobile apps. It allows using reusable UI components. With react Native you can build mobile apps that are executable on iOS and Android.
React Native is a form of React Javascript library used for creating native mobile apps. It is closely differentiated from PhoneGap (Apache Cordova), and Appcelerator titanium that uses JavaScript to create iOS apps. Unlike PhoneGap, in React Native the code is written in JavaScript but the app’s UI is fully native. It does not have drawbacks that are typically associated with a hybrid HTML5 app.
Functional App Development with React
React’s approach to building interfaces is highly functional, and the UI is a function of the current app state, which is directly proportional to a component’s state change. This improves performance. React re-renders the component and its child component, even when the state change does not directly affect the child component.
Rendering
React wraps functional components in ‘React.memo’ to prevent unnecessary re-renders if the prop it receives never changes.
State Variable
React also implements the functional concept when updating a state variable, especially when a value is based on the previous one.
State Value
React also passes the callback to the updater function, to enable access previous version of the state and update the state value.
State Change
React is a reactive library that reacts to state changes to keep the DOM updated. And we update the state using the ‘setState()’ method in a class component or the updater function in a functional component.
Mutable States
React handles mutable states by making a copy of the state data and computing the output based on the copy. It never modifies the original data.
Prop Arguments
Above everything, functional programming codes in React are pure. It goes by receiving a prop as an argument and computes the output based on the input prop. A pure component can make computations that affect and modifies some state outside of its scope, as in data fetching, and manually manipulating the DOM.
Side Effects
React does not allow performing side effects (updating title to reflect the updated count value) directly inside the body of a component to avoid inconsistencies in the app. It comes with a Hook called useEffect to manage all such side effects.
Conclusion: How do ReactJS development companies roll up React?
ReactJS App development can be formulated in multifarious ways. It can either be with JavaScript, TypeScript, Spring Boot or any other framework, that gels up and leverages React offerings.
- It starts with autoconfiguration via CLI and actuator,
- creating, and securing REST API with Spring Boot 2.2 and DevTools,
- Exploring Spring Boot Auto Configuration and Customization,
- Creating application profiles based on the environments,
- Configuring backend data using JDBC and Spring Data JPA,
- Configuring a DataSource for H2 DB, and also for Maria DB,
- Designing a REST architecture based application,
- Creating a REST application using HATEOAS,
- Consuming REST APIs endpoints with RestTemplate, Traverson, and WebClient,
- Exploring JWT web token for the RESTful APIs and exploring how to secure REST APIs using OAuth2 and Spring security,
- Creating TESTING module of the Spring Boot application and Unit & Integration testing,
- And finally deploying the application to the cloud platform (PaaS).
- Containerization and Deploy using Docker containers
However, app development companies find it difficult to debug React applications, especially when user experience issues are even more difficult to reproduce. Try using tools to monitor and track the Redux state, that automatically surfaces JavaScript errors, and track slow network requests and component load time.
Author 
Andrew Parker