React

React, which was developed by Facebook for use on its own platform and subsequently released as open source, is a library that has changed the way large websites are created. It makes them faster, not only to build but also to run. It does this by using a virtual DOM, which considerably speeds up the way interfaces are both programmed and updated. Among React's other powerful features are its ability to reuse components, its one directional data flow that keeps code stable, and an extension to JavaScript called JSX that lets programmers mix JavaScript with HTML code. React also has a mobile-centric version of the library called ReactNative, which allows developers to create fast mobile applications from a single source. Unlike applications created by libraries such as PhoneGap, these applications are completely native and very fast. Like all complex programming libraries, React is not without its drawbacks or its critics. The pace of React's development is very quick, making it difficult for some developers to keep up with all its changes. It is also not documented well. This is particularly true of the process of building applications. Many programmers also do not like how JSX has mixed JavaScript with HTML, and some also find the language to be too complex. Finally, React's use of a virtual DOM can result in both high memory and CPU usage.