JavaScript (JS)

JavaScript (JS) is a lightweight, interpreted, or just-in-time compiled programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles.

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Where JavaScript used for?

Some of basic things JS used:

  • Adding Interactive behaviour to web page: JS allows users to interact with the web pages. We can do almost everything using JS. few examples are,Show or hide more information with the click of a button
  1. Change the color of a button when the mouse hovers over it
  2. Slide through a carousel of images on the homepage
  3. Displaying a timer or count-down on a website
  4. Playing audio and video in a web page
  5. Zooming in or zooming out on an image
  6. Using a drop-down hamburger menu
  7. Displaying animations
  • Creating Web and mobile app: We can use verious javacript framworks for developing and building web and mobile apps. Popular JavaScript front-end frameworks include React, React Native, Angular, and Vue. Many companies use Node.js, as JavaScript runtime environment built on Google Chrome’s JavaScript V8 engine. A few famous examples include Paypal, LinkedIn, Netflix, and Uber!
  • Building web Server and developing Server: Beyond websites and apps, developers can also use JavaScript to build simple web servers and develop the back-end infrastructure using Node.js.
  • Game development: You can also use JavaScript to create browser games. These are a great way for beginning developers to practice their JavaScript skills.

Companies using JS


Google develops it’s own JavaScript tools i.e., is AngularJS. it’s also one of the most popular front end frameworks available. It’s even part of the MEAN stack.

Googles more services, like Google Docs, use Closure Tools. This set of tools compiles JavaScript into a lower-level for rich and highly responsive web applications.

There’s another big point to touch on. Google developed Chrome. Chrome, being a web browser, needed a JavaScript engine, so Google also made V8. V8 not only powers Chrome, it’s at the heart of NodeJS. So, without Google, there would be no Node.


Try to disable JavaScript in your web browser and try to go Facebook. The website will not work you from logging in because it won’t work without JavaScript.


Node is designed to handle requests and hand off data quickly. It’s asynchronous capabilities. Node is central to Uber’s.


Today whatever using on Twitter fail whale, It is built using Ruby on Rails. Problem faced on speed and maintainability, they decided to change to NodeJS. Node allowed Groupon to rebuild their entire website by everything into individual NodeJS web applications. Now, Groupon is made up of over 20 Node applications, and it moves much faster as a whole. Now they are shifting all their interntional website to NodeJS. It is good move from Groupon.


First off all, Microsoft works closely with the JavaScript to built its Edge of web browser.

All browsers needs to process and execute JavaScript efficiently, so Microsoft has developed and maintains its own JavaScript engine for Edge. Actually, there has been talk of them creating an alternate version of NodeJS with the Edge engine.

They thoroughly support NodeJS on the Azure cloud platform. Its one of major features for Azure, and they’ve integrated Visual Studio support for NodeJS.

Microsoft has also developed a version of Node for IoT(Internet Of Things) applications. NodeJS is great of IoT because it’s light weight and efficient.


PayPal also created n managed their own version of expresion called karnejs


Node worked so well that eBay not only using for particular service, they began shifting their entire to NodeJS. Most of you seeing in by Node. Yes Java is still dealing with DataBases but still have more trust on Node.


Over time, Netflix moved away from its more traditional structure into the cloud and started to adopting NodeJS. With Node, Netflix was able to break down pieces of their user interface into individual services. Today, a largely of Netflix interface is running on Node.


Slowly Wallmart begin to replace Java with Node. Today whatever you see in that is provided by Node. NodeJS was also the ideal choice for other web applications within their marketplaces.


NodeJS asynchronous capabilities allowed the LinkedIn mobile site to perform more quickly than before while using fewer resources. Node also made data sharing and building APIs easier for the LinkedIn developers.

JavaScript Is Everywhere!

These are only 10 examples, but you can find more. So much of the web runs on JavaScript, it whold be much harder to find a company that doesn’t use JavaScript in some way.

These companies are the largest tech companies in the world. Many are also running the largest production deployments of JS. The others are responsible for important parts of the JavaScript ecosystem as a whole.

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ARTH-School of technology, BCA graduate

ARTH-School of technology, BCA graduate