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. Build encapsulated components that manage their own state, then compose them to make complex UIs. 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.

Why not Angular or Vue.js?

Angular and Vue.js are fine choices fro a modern front-end framework. Why choose ReactJS? Well, it could be splitting hairs to say one of them is better than the other at the level of the code. However, it is difficult to the deny the momentum that the ReactJS community has been building. The choice is for the strength of the community and for the ease of interoperability that brings..

  • Declarative

  • Component-Based

  • Stateful Components

React components implement a render() method that takes input data and returns what to display. This example uses an XML-like syntax called JSX. Input data that is passed into the component can be accessed by render() via this.props. JSX is optional and not required to use React. Try the Babel REPL to see the raw JavaScript code produced by the JSX compilation step

React Native – Build native mobile apps using JavaScript and React

React Native lets you build mobile apps using only JavaScript. It uses the same design as React, letting you compose a rich mobile UI using declarative components. The apps you are building with React Native aren’t mobile web apps because React Native uses the same fundamental UI building blocks as regular iOS and Android apps. Instead of using Swift, Kotlin or Java, you are putting those building blocks together using JavaScript and React.

In addition to taking input data (accessed via this.props), a component can maintain internal state data (accessed via this.state). When a component’s state data changes, the rendered markup will be updated by re-invoking render(). Using props and state, we can put together a small Todo application. This example uses state to track the current list of items as well as the text that the user has entered. Although event handlers appear to be rendered inline, they will be collected and implemented using event delegation.

React allows you to interface with other libraries and frameworks. This example uses remarkable, an external Markdown library, to convert the value in realtime.

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