ReactJS

React is a front-end library developed by Facebook.ReactJS presents graceful solutions to some of front-end programming’s most persistent issues. It is used for handling the view layer for web and mobile apps. It’s fast, scalable, flexible, powerful, and has a robust developer community that’s rapidly growing.ReactJS allows us to create reusable UI components. It is currently one of the most popular JavaScript libraries


 According to React official documentation, the following is the definition −

`React is a library for building composable user interfaces. It encourages the creation of reusable UI components, which present data that changes over time. Lots of people use React as the V in MVC. React abstracts away the DOM from you, offering a simpler programming model and better performance. React can also render on the server using Node, and it can power native apps using React Native. React implements one-way reactive data flow, which reduces the boilerplate and is easier to reason about than traditional data binding.`

React features

• React Js is a front-end development technology. 
• The best example for this is the Facebook Front End. 
• React Js can handle the view layer for web and mobile apps. 
• When we are using React Js we can reuse UI components. 
• This is a very popular JavaScript library. 
• Lots of people use React as the V in MVC. 
• React abstracts away the DOM from us, offering a simpler programming model and better performance. 
• React can also render on the server using Node, and it can power native apps using React Native. 
• React implements one-way reactive data flow, which reduces the boilerplate and is easier to reason about than traditional data binding.

JSX - JSX is JavaScript syntax extension.It isn't necessary to use JSX in React development, but it is recommended.

Components - React is all about components. You need to think of everything as a component. This will help you maintain the code when working on larger scale projects.

Unidirectional data flow and Flux - React implements one-way data flow which makes it easy to reason about your app. Flux is a pattern that helps to keep your data unidirectional.

License - React is licensed under the Facebook Inc. Documentation is licensed under CC BY 4.0

React Advantages

• Updates process is optimised and accelerated.

• JSX makes components/blocks code readable. It displays how components are plugged or combined with.
• React’s data binding establishes conditions for creating dynamic applications
• Uses virtual DOM which is a JavaScript object. This will improve apps performance since JavaScript virtual DOM is faster than the regular DOM
• SEO-friendly
• Can be used on the client and server-side as well as with other frameworks.
•  improved readability

React DrawBacks

• It is a large SIze library

• Not using isomorphic approach to exploit application leads to search engines indexing problems.
• Lots of developers dislike JSX React’s documentation, manuals are difficult for newcomers’ understanding.

what is virtual DOM?

React.js constructs efficient virtual DOM known as Document Object Model or vDOM. It allows to create light DOM tree and save it on server-side. It is one of the benefits of working like that:

• While the user is interacting with Internet resource, new vDOM is being created.
• Previous and recent versions are compared.
• If mentioned versions have diffs, the vDOM will be rebuilt.

What is Babel?

"Babel is a JavaScript compiler that can translate markup or programming languages into JavaScript. With Babel, you can use the newest features of JavaScript (ES6 - ECMAScript 2015). Babel is available for different conversions. React uses Babel to convert JSX into JavaScript."

What is Server-side Rendering?

The mentioned above feature provides creating isomorphic/universal web apps. It accelerates loads of starting page because users do not need to wait for JavaScript loadings before viewing web sites.

what is One-way Data binding?

It is always easily seen changing data place. It helps to monitor, to debug React’s self-contained components fast, especially in large applications.

                                                    Conclusion

React enables you to focus on how to present your application state in a simple and predictable way. The learning curve for adapting React is minimal and there are numerous components readily available that in many cases probably already does what you need.