What is React JS?
What is React JS?

React is an open-source JavaScript library for building user interfaces. It was created by Jordan Walke, a software engineer at 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.

React is maintained by Facebook, Instagram and a community of individual developers and corporations. According to JavaScript analytics service Libscore, React is currently being used on the websites of Netflix, Imgur, Bleacher Report, Feedly, Airbnb, SeatGeek, HelloSign, Walmart, and others.

 

NOTABLE FEATURES

  • One-way data flow

Properties, a set of immutable values, are passed to a component's renderer as properties in its HTML tag. A component cannot directly modify any properties passed to it, but can be passed callback functions that do modify values. This mechanism's promise is expressed as "properties flow down; actions flow up".

  • Virtual DOM

Another notable feature is the use of a "virtual Document Object Model," or "virtual DOM." React creates an in-memory data structure cache, computes the resulting differences, and then updates the browser's displayed DOM efficiently. This allows the programmer to write code as if the entire page is rendered on each change while the React libraries only render subcomponents that actually change.

  • JSX

React components are typically written in JSX, a JavaScript extension syntax allowing quoting of HTML and using HTML tag syntax to render subcomponents.

  • Architecture beyond HTML

The basic architecture of React applies beyond rendering HTML in the browser.

 

WHY REACT.JS?

#Simple & Declarative

React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable and easier to debug.

#Composable Components

React isn't an MVC framework. React is a library for building composable user interfaces. It encourages the creation of reusable UI components which present data that change over time. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep state out of the DOM.

#Learn Once, Write Anywhere

Develop new features in React without rewriting existing code. React can also render on the server using Node and power mobile apps using React Native.

#It's From Facebook

React has been developed by some of the brightest brains in computer science to solve scale problems for billions of users.

 

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