React.js Interview Questions and Answers

ReactJS is an open source JavaScript library built by a group of engineers at Facebook and Instagram for building user interfaces (UI) for web applications and mobile applications. React aims primarily to provide speed, simplicity, and scalability. React also allows us to create reusable UI components. React was first created by Jordan Walke, a software engineer working for Facebook. He was influenced by XHP, an HTML component framework for PHP. It was first deployed on Facebook’s newsfeed in 2011 and later on Instagram.com in 2012. It was open-sourced at JSConf US in May 2013. React first deployed on Facebook’s newsfeed in 2011 and on Instagram.com in 2012.

React Native, which enables native Android, iOS, and UWP development with React, was announced at Facebook’s React.js Conf in February 2015 and open-sourced in March 2015.

On April 18, 2017, Facebook announced React Fiber, a new core algorithm of React framework library for building user interfaces. React Fiber will become the foundation of any future improvements and feature development of the React framework. (Ref wiki says )

Current version is React v 17.0.1 / October 22, 2020.

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