What Is ReactJS Used For | How React Works In Real-time

Hey, guys, welcome back to another post by appsloveworld. In this post We’ll be learning all about react js.

So we’ll be covering topics on what is react, What Is ReactJS Used For, features of React, react prerequisites, and its industry trends.

Let’s go ahead and begin with what is react?

React is a JavaScript library used to build fast and interactive user interfaces for both Web and Mobile Applications. Now, one thing that makes the react extremely powerful is the fact that it’s open-source.Any user can access its source code, modify it, and enhance it.

In a typical model view controller architecture. React defines the view part of the application and is also responsible for how the app looks and feels.

Fun fact -React was built by Jordan walke, an engineer at Facebook

Now let’s go ahead and see how React works in real-time

Consider a typical Web application, the entire UI of the webpage is divided into several components.

For example, see the below Webpage Snapshot.

what is reactjs used for
We have the header component,search component,Hotel search component, and a best deal component. These components make the code easier to debug.

Components also make the development and maintenance of web applications faster as multiple developers can work simultaneously on different components of the same application.

What Is ReactJS Used For and why React is so popular these days

React very useful in the creation of dynamic web App. It also provides performance enhancements. There are several performance enhancements like Virtual DOM and one-way data binding.

ReactJs uses reusable components,this decreases the development time. React involves the uni-direction flow of data and also has a small learning curve.

ReactJs can also be used for mobile applications. React recently, release an extension call, react-native that is used for developing mobile applications that are cross-compatible. It also has dedicated tools for easy debugging.

Now let’s talk about the features of the React

First, let’s understand the JSX

JSX is a syntax extension to JavaScript. Using JSX we can add HTML to the JavaScript file. All coding in react is done using JSX.

jsx

So that React code is easier to understand and debug. you can say that the JSX file is a combination of JavaScript and HTML just like standard HTML in which we can have the JavaScript and HTML element.

Now let’s consider a small example.Here ,Cons simple is a JavaScript notation. H1 tags indicate HTML. Again the semicolon indicates JavaScript. Note that the semicolon is not mandatory. However, it’s a good practice to include it.

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Moving on to the next feature as Virtual DOM-

DOM is an acronym for data object model, actually defines how documents are accessed and manipulated in a webpage and represent the entire structure of the page in the form of a tree

Now let’s see how this actually works

ReactJs creates and maintains a virtual DOM that is the same copy of the real DOM. This feature of ReactJs makes a big difference when it comes to performance

Coming to the next feature performance

React uses virtual dom as discussed earlier, virtual dom Impact the speed of the Web applications. We also took an example of WebPage(above) and learned how multiple components can affect the development time. They help improve performance drastically.

what is reactjs used for

The next feature is one-way binding

This means information flows in only one direction. One way data binding is specifically used when information is displayed and not updated.

Remember that the components of React are functional in nature. That is, they receive information through arguments and pass information via their return values.

The next important feature is extensions

React has many extensions that we can use to create full-fledged front end applications. it provides server-side rendering, which means that the application is rendered on the server rather than in the browser.

React Native, which is a react extension, is used for developing mobile applications there are many other extensions that React provide for every scenario in web development. Now let’s look at a few of them.

React Native, lets you build mobile applications using only JavaScript.React Native app is a real mobile application and not just a web application running on your mobile devices. Thousands of applications like Facebook, Instagram, Pinterest, Skype use React Native.

The next popular React extension is flux.

Flux is the application architecture that Facebook uses, flux implements a unidirectional flow which makes it easier to understand what actually is going on.

React extension is flux.

Now let’s see how it works.when we triggered an action. The dispatcher will get notified. The dispatcher receives actions and dispatches them to the stores.

A store is what holds the data of an application. Stores will register with the applications dispatcher so that they can receive actions. Data from stores is displayed in views. Actions defined the internal API of your application. They capture how anything might interact with the application.

The last feature of React is ,React Applications are easy to debug. Thanks to the large and active developer community. You can practically debug react code within your browser. React debugging tools allows the user to inspect the code and also easily debug it.

Let’s learn about the building blocks of React

Components, state, and props, other essential concepts that one should know before implementing react. They are the foundation on which the React is built.

Let's learn about the building blocks of React

Now, what exactly are React components?

we can say that Components are the building blocks of any React application. React divide the user interface into multiple components, wherein each component defines how a particular element is viewed in the application.

React components remain discrete and processed independently. Another feature is the re-usability. Components can be used multiple times across the application. This reduces development time.

what is reactjs used for

Consider the following code snippet. A component is implemented as a JavaScript class, having some state and a render() method. The state is the data that we want the component to render. render() method is responsible for how the UI looks and feels to the user.

import React, { Component } from "react";

class Buttonclick extends Component {
    constructor(props) {
        super(props);
        this.state = {
            count: 0,
        };
    }
    incrementcount = () => { this.setState({ count : this.state.count + 1 } )}
    render() {
        const { count } = this.state;
        return <span><button onClick={this.incrementcount}>Click Me-{count} times</button></span>
    }
}

export default Buttonclick;

The next concept is the state

The state is known as the component object that holds some data. This data influences the output of a component. Every time the state of an object changes, the component is rendered onto the screen.

Now let’s see what props are?

Props are short for properties that allow us to pass arguments or data to components. Properties help make components more dynamic. It is important to define all the properties, their types, and their default value. props are pass to components in a way similar to that of HTML attributes.

Now consider the following code snippets. This shows exactly how properties are pass to components.

Now let's see what props are

let’s go through some of the things that you should know before you can actually start working on react.

  • You should be familiar with programming concepts like functions, objects, arrays, and classes. One should also have a basic knowledge of JavaScript and a familiarity with HTML.
  • Don’t worry if you feel like you’re not good at them. Once you start working on them, you’ll get a good hang of it.
  • Finally, let’s go to the impact of react on the IT industry and get insights into the salaries of react developers ,Statistics show that React developers Earn way more than other Web developers. According to pay-scale, the average salary for the React developer in the United States is a 91000 US dollars. The average salary for the developer in India is seven point 7.2lkh per annum.Source
  • Over recent years, React has gained immense popularity and is being adopted by many companies, according to the data by Google Trends, React had a better growth scale compared to other frameworks like Angular and Vue.js.
  • Statistics show that front developers have wholeheartedly adopted this lightweight framework, forgoing other available options. If you are skilled and have a knack for front end development, React can help you gain fantastic career opportunities.

Lastly, talking about a few companies that use React, we have Facebook, Instagram, Netflix, Dropbox, WhatsApp, among others.

Capture

So that is it for this post. I hope you enjoy learning about react to gain more in-depth knowledge about React , read below post

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