It’s a JavaScript library by Facebook. It helps in building very attractive and interactive user interfaces. It offers great performance and is extremely easy to use for programmers. Today, New York Times, Slack, Pixnet and other 100,000+ such well-known sites with heavy traffic use this library.

Yes, we are talking about ReactJS – the JavaScript library which is the hot favorite of developers and is climbing the popularity charts every day. According to the 2016 StackOverflow developer survey, React.Js’s popularity had recently increased by over 300%.

What is making ReactJS so popular? Let’s take a look

1. Quick Implementation:
   The very fact that ReactJS is a library and not a full-fledged framework makes it extremely easy to implement into any project. It is just a view layer and that’s what makes it so attractive in terms of quick adoption.
2. Fast Rendering:
   This is one of the best features of ReactJS. The smart methods in ReactJS mitigate the amount of DOM operations and optimize and accelerate the updates process – all these things make the overall rendering very fast.
3. Code Stability:
   ReactJS uses downward data binding. Through one directional data flow and by making ReactJS just a view system, Facebook has ensured that any changes to the child elements don’t affect their parent elements and parent data. While allowing for direct work with components, it ensures that the code remains stable. Changing an object is also very easy – the developers simply need to modify its state and apply updates. With this, only the allowed components are upgraded maintaining the overall code stability.
4. Ease of Use:
   ReactJS uses JSX which is a HTML-like syntax. It allows the creation of JavaScript objects using HTML syntax and simplifies the creation of React tree nodes with attributes. Anybody familiar with HTML can very easily use JSX and build a ReactJS application. The code built using JSX is machine-readable. It allows the creation of compound components in one compile-time verified file.
5. Code Reusability:
   Another big advantage of ReactJS is its ability to reuse code components. The reusability of components saves a lot of time and efforts for developers. Managing system updates is very easy with ReactJS because every change does not necessarily affect each component in the system. The React components are isolated and a change in one does not affect the others. This allows the developers to reuse the components and makes coding more precise and comfortable for the developers.
6. Easier Debugging:
   One of the things which developers love about ReactJS is the descriptive warnings. New developers working with ReactJS find it very useful to know what exactly went wrong, where is the error in the code and what is the best way to fix it. Debugging becomes very easy and less time consuming with React.
7. Constantly Developing Library:
   Facebook released ReactJS as the first JavaScript-connected open source project. Developers using ReactJS have free access to a variety of useful applications and tools from the community at large. There are over 1000 open-source contributors who are working with ReactJS library and enhancing it every day. Apart from this, there is an excellent community support extended through groups, conferences, and documentation.

Real-World Examples of ReactJS Usage:

Asana:
This web and mobile application which helps teams improve collaboration and communication moved to ReactJS in 2016 to create a more maintainable, readable, testable, and performant application.

Atlassian:
The creator of products like JIRA, Confluence, HipChat, etc. moved to React for its simplicity, component-based structure, testability, and maintainability.

Netflix:
This leader in the internet delivery of TV shows and movies, transformed its desktop and mobile user interface in 2015 using React. React was selected for its ease of use and runtime performance.

Yahoo Mail:
Yahoo Mail, which has been around since 1999, decided to use ReactJS + Flux when it wanted to build its next-generation Mail product. ReactJS was chosen for its independent deployment of components, easy debugging, and shorter learning curve.

Apart from these, there are numerous other examples such as Uber, Salesforce, KISSmetrics, Tesla, Scribd, Reddit, Periscope and many more which have leveraged the power of ReactJS to build world-class interactive web applications.

With ReactJS, organizations can quickly and easily build UI rich applications with good performance. With its component re-usability feature, it offers code re-usability and saves a lot of time and effort for developers. It is extremely easy to edit, test, and debug the code which makes the web applications very maintainable.

If you are looking to develop SEO-friendly, interactive web applications with great UI and expect your application to handle heavy traffic, it’s time to migrate to ReactJS.