React.js is a JavaScript library developed by Facebook. React is a library for building composable UIs. It empowers the creation of reusable UI segments which present data that changes over time. Many people make use of React as the V in MVC. React abstracts away the DOM from you, resulting in a complex programming model and better execution. React can also render on the server using Node, and it can power local apps using React Native. React actualizes one-way reactive data stream which reduces standard and is easier to reason about than traditional data binding.
Fast - Feel quick and responsive through the Apps made in React can handle complex updates.
Modular - Allow you to write many smaller, reusable files, instead of writing large, dense files of code. Modularity of React is a beautiful solution for JavaScript's visibility issues.
Scalable - React performs best in case of large programs that display a lot of data changes.
Flexible - React approaches differently by breaking them into components while building user interfaces. This is incredibly important in large applications.
Popular - ReactJS gives better performance than other JavaScript languages due to t’s implementation of a virtual DOM.
1. JSX − JSX is a preferable choice for many web developers. It isn't necessary to use JSX in React development, but there is a huge difference between writing react.js documents in JSX and in JavaScript.
2. Unidirectional data flow and Flux − React.js is designed in such a manner that it will only support data that is flowing downstream, in one direction. If the data has to flow in another direction, you will need additional features.
3. Components − Components are the heart and soul of React. Components (like JavaScript functions) let you split the UI into independent, reusable pieces, and think about each piece in isolation.
Frequently Asked React JS Interview Question & Answers
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