What is React Js?

React JS is a javascript library for building user interfaces. React is often used with other libraries such as Redux and Axios. It’s different from MVC, which separates the data and the view into two separate layers. React has a uni-directional data flow that captures changes in state and props to update only the necessary parts of the application.

A component can be thought of as a displayable piece of UI, with its own logic and presentation. A prop stands for “property”, which is an attribute or metadata that can be passed to or from a component. Props are essential parameters that we supply to the component so it knows what we want it to do in order to render on the screen.

The react js front end development is an open-source library built by Facebook, and its goal was to make it easier for developers to build fast UIs. React is one of the most popular front-end JavaScript libraries for building user interfaces that can be used on desktop web applications, mobile apps, or single-page websites.

React has three main principles:

1) User interface should be defined in terms of components that describe how data changes over time.
2) Components should be reusable.
3) Components should update when data changes (and not just when their state changes).

What are the Features of react js?

It’s used to create interactive views for data. It has an intuitive, component-based architecture that lets developers build large applications in a more organized and maintainable way.

Features:

- The React library is written in JavaScript, which means it can run on both the front end and the back end of your application.
- React implements one-way reactive data flow, which simplifies debugging and stays out of sync bugs.
- Its virtual DOM implementation encourages good programming practices by making the code easier to read through, debug, and maintain.
-React has a component-based architecture which makes it easy to break down big applications into reusable pieces. This also reduces the size of your bundle by making it easier to not include unused code.
- Supports hyperlinks and events — you can create interactive components like buttons or menus without using complex abstractions like jQuery or AngularJS.