React JS

React JS is a JavaScript library created by a cooperation of Facebook and Instagram. By using this developers create fast user interfaces.React is a declarative, efficient, and flexible JavaScript library for building user interfaces.React has a few different kinds of components, but we'll start with React.Component subclasses:


React is front end library developed by Facebook. It's used for handling view layer for web and mobile apps. ReactJS allows us to create reusable UI components. It is currently one of the most popular JavaScript libraries and it has strong foundation and large community behind it.

React is a library for building composable user interfaces. It encourages the creation of reusable UI components which present data that changes over time. Lots of people use React as the V in MVC. React abstracts away the DOM from you, giving a simpler programming model and better performance. React can also render on the server using Node, and it can power native apps using React Native. React implements one-way reactive data flow which reduces boilerplate and is easier to reason about than traditional data binding.

React Features


  • JSX − JSX is JavaScript syntax extension. It isn't necessary to use JSX in React development, but it is recommended.
  • Components − React is all about components. You need to think of everything as a component. This will help you to maintain the code when working on larger scale projects.
  • Unidirectional data flow and Flux − React implements one way data flow which makes it easy to reason about your app. Flux is a pattern that helps keeping your data unidirectional.
  • License − React is licensed under the Facebook Inc. Documentation is licensed under CC BY 4.0.


React uses JSX for templating instead of regular JavaScript. It is not necessary to use it, but there are some pros that comes with it.

  • JSX is faster because it performs optimization while compiling code to JavaScript.
  • It is also type-safe and most of the errors can be caught during compilation.
  • JSX makes it easier and faster to write templates if you are familiar with HTML.


Life cycle Methods


  • componentWillMount is executed before rendering, on both server and client side.
  • componentDidMount is executed after first render only on the client side. This is where AJAX requests and DOM or state updates should occur. This method is also used for integration with other JavaScript frameworks and any functions with delayed execution like setTimeout or setInterval. We are using it to update the state so we can trigger the other lifecycle methods.
  • componentWillReceiveProps is invoked as soon as the props are updated before another render is called. We triggered it from setNewNumber when we updated the state.
  • shouldComponentUpdate should return true or false value. This will determine if component will be updated or not. This is set to true by default. If you are sure that component doesn't need to render after state or props are updated, you can return false value.
  • componentWillUpdate is called just before rendering.
  • componentDidUpdate is called just after rendering.
  • componentWillUnmount is called after the component is unmounted from the dom. We are unmounting our component in main.js.



If you want to work with ReactJS, you need to have solid knowledge of JavaScript, HTML5 and CSS. Even though ReactJS doesn't use HTML, the JSX is similar so your HTML knowledge will be very helpful.

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  • Well researched advanced course content created by Industry professionals
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Course Syllabus

  • ReactJS - Intro
  • ReactJS - Environment Setup
  • ReactJS - JSX
  • ReactJS - Components
  • ReactJS - State
  • ReactJS - Props Overview
  • ReactJS - Props Validation
  • ReactJS - Component API
  • ReactJS - Component Life Cycle
  • ReactJS - Forms
  • ReactJS - Events
  • ReactJS - Refs
  • ReactJS - Keys
  • ReactJS - Router
  • ReactJS - Flux concept
  • ReactJS - Using Flux
  • ReactJS - Animations
  • ReactJS - Higher order Components
  • ReactJS - Best Practices
  • ReactJS Useful Resources

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