ReactJS vs JavaScript – What are the differences?

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    Subhanu Sankar Roy
ReactJS vs JavaScript – What are the differences?

In this article we are going to look at the difference between React JS and the language which it is developed from, which is JavaScript. We are going to compare and contrast the differences between these two and why if you wish to go towards front-end development, learning ReactJS can help you build more complex apps.


Let’s dive deeper into the origin of the largest programming/scripting language community out there, JavaScript.

Largest communities of Programming Languages

Origin of Javascript

Origin of Javascript

JavaScript was developed in 1995 by Brendan Eich at Netscape Communications. Netscape and Eich designed JavaScript as a scripting language for use with Netscape Navigator, the company’s flagship web browser. Originally known as LiveScript, Netscape changed the name to JavaScript to position it as a companion language to Java, a product of its partner Sun Microsystems. However, apart from some superficial syntactical similarities, JavaScript is in no way related to the Java programming language.

Why is it popular?

For beginner, intermediate, and advanced developers

JavaScript requires no environment configuration;

Just open a browser like Chrome, go to developer tools and start coding.

Writing a “Hello World” program is as simple as:

console.log("Hello World");
Code language: JavaScript (javascript)

JavaScript’s flexibility makes it more suitable for advanced developers. The language simply helps get things done by allowing the developer to focus on solving the problem. Developers can use a combination of plugins and their own code snippets to make an app work.


JavaScript can be run anywhere including:

  • Devices such as cell phones, tablets, and laptops
  • Both client-side and server-side

This ability to run anywhere makes JavaScript a universal language.

Open standards and community

ECMAScript is the standardized version of JavaScript and an open standard language.

Enterprises can use ECMAScript to create a JavaScript implementation.

According to Wikipedia, “An ECMAScript engine is a program that executes source code written in a version of the standard ECMAScript language, such as JavaScript.”

The most popular engines, V8 and SpiderMonkey, are open-source projects.

JavaScript has been around for 25 years and has a huge community behind it.

Modern Frameworks

Modern frameworks like React, Angular, and Vue.js have been stabilized and are being optimized for better performance.

Most frameworks are sophisticated. friendly with good community support.


What is ReactJS?


React, (also known as ReactJS or React.js) is a popular free, open-source front-end JavaScript library used to build front-end components and user interfaces.
It was created by Facebook and they still maintain it. with a growing community of companies and individual developers.

React is often used as the code base for SPAs (single-page applications).

Currently listed at the top of many industry rankings for popularity, developer satisfaction, and most in-demand industry tools. Let’s learn how did React come about? And what made it such a popular and widely used tool?

Origin of ReactJS

History of ReactJS

‘In 2011, as the Facebook Ads app gained momentum, its code began to see many new updates and team members that became overwhelming and difficult to manage after a while. T

o fix this problem, Jordan Walke developed FaxJS, a prototype that makes this process more efficient. This was the birth of what would become the version of React we all know and love today.

Now, despite being very new, ReactJS gained a lot of traction and as per 2019’s Stack Overflow Developer Survey, ReactJS emerged as the most loved web framework. Let’s look at the reasons for the same 😉

2019’s Stack Overflow Developer Survey

Why is it popular?

Beginner Friendly

ReactJS is easy to understand and implement, and that’s one of the main reasons for its popularity.

You can learn it quickly and start building things with it. ReactJS comes with a healthy supply of documentation, tutorials, and training resources.

The learning process will be easier if you have knowledge of JavaScript.

Reusable components for easy development and maintenance

Reusable components are the React components that you can use multiple times in your application.

It starts with small components (like buttons, checkboxes, dropdowns, etc.) that build larger components. Things (like wrapper components) that can in turn be used to build applications.

How 3 different small components make a larger one

Each component has its own logic and controls its own execution and can be reused anywhere you need it. Components make your application easier to develop and maintain.

In addition, components help you achieve a consistent look and feel throughout your solution.

To develop more robust, interactive, and dynamic web applications

Developing a dynamic website requires a lot of complex coding. Requires certain HTML strings. With ReactJS you can take advantage of the JSX function that allows you to create HTML within JavaScript code.

Example: Using regular JavaScript, you can create an HTML string like this:

var className = "Test"; var text = "Hello World"; var htmlElement = "<div class=\"" + className + "\">" + text + "</div>";
Code language: JavaScript (javascript)

You may find that using JavaScript strings to create HTML elements is a little tricky.

ReactJS allows you to create HTML elements using JSX, replacing values ​​in {} with the value that the JavaScript code evaluates:

var myClassName = "Test"; var text = "Hello World"; var htmlElement = <div className={myClassName}>{text}</div>;
Code language: JavaScript (javascript)

Virtual DOM enables fast rendering

If you are building an application that requires a lot of user interactions and data updates you need to consider the impact of application structure on overall performance.

Even if your application is built with fast client platforms and JavaScript engines, extensive DOM manipulation can be a performance bottleneck.

This can lead to an annoying user experience. In the worst case, due to the tree structure of the DOM, simple top-level changes can break the UI.

Virtual DOM in REACT makes it faster

ReactJS solves the above problem through a virtual DOM. Here, the changes made are first reflected in the virtual DOM, which resides in memory and not on your screen.

An intelligent algorithm analysis changes made to the virtual DOM to identify changes that need to be reflected in the original DOM.

In addition, it determines the most effective way to make those changes and implements the changes to the original DOM.

Update time is minimal. With this, you can be sure that the overall performance of the application is optimal.

SEO friendly mechanism

Search engine optimization or SEO is crucial if you want to increase traffic to your website or portal.

ReactJS allows you to take advantage of SEO: it significantly reduces page load time through faster rendering speed.

React is very SEO friendly

Technically, ReactJS allows you to use the same code for the client-side and server-side app components (making it “isomorphic”), meaning a website using it can compete for organic traffic.

This is not the case with most other libraries or frameworks.

Testing is a breeze

One of the factors that make ReactJS so popular is the ease of testing React-based applications.

What makes it easy to test React-based apps is that their views can be treated as functions of a specific state.

You can manipulate any state that you move through the reaction view. You can then view the output and all functions, actions, and events to see if the app is working properly.

ReactJS also includes a list of testing utilities that you can use to test your components.

The tutorial details how to use each testing utility in your app.

React Native: Cross Platform Mobile Development

What if you could develop cross-platform apps without the help of Objective-C, Java, or Swift? ? What if you could save time, money and human resources when developing mobile apps?

React Native, the native version of ReactJS, is a cross-platform mobile app development framework to help you.

In fact, it has become a popular trend to develop high-quality, high-performance, native mobile apps for iOS and Android:

  1. apps based on this framework are more efficient and agile;
  2. they load faster and run smoother (require less memory);
  3. In addition, if you encounter any problems, you can always rely on strong community support for React Native.

Why trust ReactJS?

Companies using React

The simple fact is that React is a safe bet for most front-end developers. Many tech giants use React, including:

  1. Uber
  2. Airbnb
  3. Facebook
  4. Netflix
  5. Pinterest
  6. Instagram
  7. Shopify
  8. Amazon etc

Also, React has been around for a while (in internet years, at least) and has reached a level of maturity.

Over the years, React has built strong, readily available documentation and an active community.

The sense of stability that comes with maturity is reassuring for many organizations that rely on React as a core element of their technology stack. Especially when the world of technology is constantly and rapidly evolving.

Overview of ReactJS vs JS

For all kinds of developersVery easy to learn and use
Very difficult to make complex appsReusable components help in easy development
Difficult to maintain a consistent UIComponents help in maintaining consistent UI
Works with Real DOM, hence slower websitesWorks with Virtual DOM, hence a much faster website
No special SEO supportHas special SEO support to increase traffic on the website
JS vs ReactJS


So in this article, we looked at the differences between ReactJS and Javascript. We understood why learning ReactJS is a better option for a beginner.

You can follow this learning path, as it teaches you everything from scratch including Javascript and React along with building very high-quality hands-on projects.

Hope you liked reading this article! 😊

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