React Introduction - What, Why, Who

React Introduction - What, Why, Who

What is react ?

ReactJS is an open source JavaScript library Developed by Jordan Walke, a software engineer working at Facebook

Why React?

1) It makes easier developing a large Single Page Application (SPA) because it allows a developer to break down the complex UI into simpler components. We can reuse components as needed and compose bigger components from smaller ones.

2) React’s reconciliation algorithm – It implements  in Virtual DOM that makes the application fast. Virtual DOM allows ReactJS to know when exactly to re-render because it can detect when the data has changed.

Note - DOM (Document Object Model) is an object that is created by the browser each time a web page is loaded which can dynamically add or remove the data at the back end.

3) One-Way Data Binding - ReactJS follows unidirectional data flow or one way data binding. Which means the data flows in a single direction because of this application’s state is contained in specific stores. As a result, rest of the components remains loosely coupled and application is more flexible leading to increased efficiency.

4) React follow the principle of immutable data. It means we create the copies of object and replace them instead of modifying the original.

5) Server-Side Rendering(SSR): It you to pre-render the initial state of our react components at the server side only. By this the browser can now start rendering without having to wait for all the JavaScript to be loaded and executed. As a result, the webpage loads faster. Here the user will be able to see the web page instead of React downloading the JavaScript

Who uses React ?

Instagram web site and Facebook newsfeed section is developed with react and it is used by other companies such as PayPal, Uber, Apple and Airbnb.