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React JS – A Simple React JS Starter Guide For Beginner

By Aspire Softserv 3 Dec 2020


Today In this blog article, we will learn React JS Features, React JS Introduction, React js pros and Cons, and most important you will get more details about Aspire SoftServ React-based portfolio.

So we will go through each and every topic.

React JS Introduction

In the 2013, ReactJS is an open-source, popular, component-based front-end library known for the view layer of the application. 

“React is a flexible, declarative, efficient, and JavaScript library for building user interfaces. ‘V’ means in MVC in the React.“

Let us understand this with a practical example:

The Magic of React Js

Magic or Power of React Js ??

Let’s see with an real-life example

On Facebook,  you can like any image and then you start checking out the comments too. Now while you are browsing over comments you see that the likes count has increased by 100, since you can like the picture, even without reloading the page. This magical count change is because of Reactjs.

React Js Prerequisites

In this paragraph, we will look into prerequisites for react js development to learn and explore React Js: 

  • Basic Knowledge of HTML, CSS, DOM JavaScript, and programming.
  • Knowledge of ES6 syntax and features.
  • Node.js and npm installed globally.

You can check out our “Aspire React Series” as below:

Below are the popular features are as below: 

JSX: JSX stands for JavaScript XML. JSX enables to write HTML in React and easier to write and add HTML to React.


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.


In the Component-Based, Developers can build encapsulated components that manage their own state, then compose them to make complex UIs.

As you know component logic is written in JavaScript instead of templates, you can easily and efficiently pass rich data through your react app and prevent the state out of the DOM.

Learn Once, Write Anywhere

Without any predictions about the rest of your technology stack, so you can develop new features in React in less time and without rewriting existing code.

React can also use Node for rendering on the server and power mobile apps using React Native.


Components are considered as pure javascript functions that help make the code easy by splitting the logic into user-friendly reusable independent code. 

In React JS, Components are considered as functions and components as classes

Components also have state, props which makes life easy. Inside a class, the state of each of the props is well maintained.

Virtual DOM

React creates a virtual dom instead of using actual DOM as compare to Angular.

For Example, React uses in-memory data -structure cache for virtual DOM. Only the final changes of DOM have later been updated in the browser’s DOM.

Javascript Expressions

JS expressions can be used in the jsx files using the curly bracket.

For example: {}

React hooks

React Hooks are functions that allow developers to “hook into” React state and lifecycle features from function components. it makes code readable and easily understandable. Hooks allow developers to use to React without classes.

React provides a few built-in, the most useful Hooks, is for controlling states and side effects in React Components. like useState, useContext, useReducer and useEffect. 

Hooks should only be called at the top level (not inside loops or if statements). Hooks should only be called from React function components, not normal functions or class components

React JS Example

Below is an example of React js is as per React Js Example:

Code URL: https://codepen.io/vinn_aspire/pen/bGeyzLq

React Js Tutorial Aspire SoftServ

React JS Advantages:

In this section, We listed down the Important Pros/Benefits of using ReactJS are mentioned as below:

  • Open-source: Reactjs is an open-source javascript library, so it is easy to start with.
  • Library from Facebook: ReactJS has become very popular in a short span and maintained by Facebook and Instagram. ReactJS the library is well maintained and kept updated by Facebook.
  • React JS Rich UI: ReactJS can be used to develop rich UI for both desktop and mobile apps.
  • Easy to debug and test as most of the coding is done in Javascript.
  • Faster App using in-memory data-structure cache – ReactJS uses virtual dom that makes use of in-memory data-structure cache, and only the final changes are updated in browsers dom. This makes the app faster.
  • React Components – Flexible and Ease of Use: You can create components of your choice by using the react component feature. The components can be reused and also helpful in code maintenance.
  • Popularity: It is used by many famous companies like Apple, Netflix, etc.

React JS Disadvantages:

Here, are the cons/ drawbacks of using ReactJS:

  • Most of the code is written in JSX, i.e., Html and CSS are part of javascript, it can be quite confusing as most other frameworks prefer keeping Html separate from the javascript code.
  • The file size of ReactJS is large

What’s Next:

you can read more about a blog on 5-Minute Guide to Create a New React App

About Aspire SoftServ

Aspire SoftServ ranks among the leading ReactJS development companies in India, United States (USA). We have successfully delivered top-quality ReactJS development projects with a 100% success ratio.

Aspire SoftServ Portfolio

Visit our Aspire Portfolio Section for all the Front-end UI-UX Projects.

Aspire SoftServ has expertise in many trending technologies like Liferay, Java, Angular, React Native, Blockchain, and many more. For more information visit our service page.

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