React

Introduction

React is a JavaScript library created by Facebook, which is used to create views (HTML web pages). React views are a compilation of components (blocks of HTML); each component contains knowledge of its internal ‘state’.

Whenever the components internal properties are changed (Data values added to HTML tags), it triggers a re-render(Update) of the DOM(Document outline) as the original state of the view has changed. In React this is done asynchronously through the use of Virtual DOM. With any component change the in-memory DOM gets replaced by the Virtual DOM and a re-render occurs.