What is React?
React is a tool for building UI components.
How does React Work?
React creates a VIRTUAL DOM in memory.
Instead of manipulating the browser's DOM directly, React creates a virtual DOM in memory, where it does all the necessary manipulating, before making the changes in the browser DOM.
React only changes what needs to be changed!
React finds out what changes have been made, and changes only what needs to be changed.
You will learn the various aspects of how React does this in the rest of this tutorial.
Current version of React.JS is V17.0.2 (August 2021).
Initial Release to the Public (V0.3.0) was in July 2013.
React.JS was first used in 2011 for Facebook's Newsfeed feature.
Facebook Software Engineer, Jordan Walke, created it.
Current version of
v4.0.3 (August 2021).
create-react-app includes built tools such
as webpack, Babel, and ESLint.