React DOM takes care of updating the DOM to match the React elements. Unlike browser DOM elements, React elements are plain objects and are cheap to create. Then the virtual DOM will try to find the most efficient way to update the browser’s DOM. So when it needs to read or write to the DOM, it will use the virtual representation of it. So, to make it faster, React implements a virtual DOM that is basically a DOM tree representation in JavaScript. It defines the logical structure of documents and the way a document is accessed and manipulated.). How does it work: While building client-side apps, a team of Facebook developers realized that the DOM is slow (The Document Object Model (DOM) is an application programming interface (API) for HTML and XML documents. A component may also maintain an internal state – for example, a TabList component may store a variable corresponding to the currently open tab. Components can be nested within other components to allow complex applications to be built out of simple building blocks. A React application is made of multiple components, each responsible for rendering a small, reusable piece of HTML.

The declarative view makes your code more predictable and easier to debug. It designs simple views for each state in your application, and React will efficiently update and render just the right component when your data changes. React uses a declarative paradigm, react application aims to be both efficient and flexible. It promotes the development of reusable UI components that display dynamic data. React is used to create modular user interfaces. ReactJS is an open-source, component-based front-end library responsible only for the view layer of the application. React is a declarative, efficient, and flexible JavaScript library for building user interfaces. ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.DevOps Engineering - Planning to Production.

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