What is JavaScript? Use case of JS in top industries ..

➼ What Is JavaScript​ ? :

JavaScript, often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. JavaScript is high-level, often just-in-time compiled, and multi-paradigm. It has curly-bracket syntax, dynamic typing, prototype-based object orientation, and first-class functions.

It’s is also used in Web Development for improving user experience. JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.

➼ Advantages of JavaScript​:

• Speed — Client-side JavaScript is very fast because it can be run immediately within the client-side browser.
• Simplicity — JavaScript is relatively simple to learn and implement.
• Gives the ability to create rich interfaces.
• Popularity — JavaScript is used everywhere on the web.
• Extended functionality to web pages
• Platform independent
• Easy to Debug and Test: JavaScript code is interpreted line by line. The errors are indicated along with line number. It is very easy to find error in the code, correct it and test it gain.

➼ UseCase Of JavaScript​ :

1. Web Development

JavaScript is a client scripting language that is used for creating web pages. It is a standalone language developed in Netscape. It is used when a webpage is to be made dynamic and add special effects on pages like rollover, roll out and many types of graphics. It is mostly used by all websites for the purpose of validation. In addition to validations, it supports external applications like PDF documents, running widgets, supporting flash applications, etc. It can also load content into a document whenever the user requires it without even reloading the entire page.

2. Server Applications

Node JS is built on Chrome’s Javascript runtime for building fast and scalable network applications. It uses event-driven, lightweight, and efficient applications which are to be distributed over the systems with the help of a server. Javascript is used to handle HTTP requests and generate content. When a user is writing thick applications in JavaScript on the client then a user may even write the logic in JavaScript on the server so that cognitive leaps can be done from one language to the other.

3. Web Servers

Using Node JS a web server can be created. The advantages of Node JS are that it is event-driven and would not wait for the response of the previous call. It moves to the next call and takes advantage of events to get notifications when a response is received for a previous call. The servers built on Node JS are very fast and do not use buffering and transfer chunks of data. In addition to this, it is single-threaded with event looping which is used in a non-blocking way. The HTTP module can help in creating a server by using the createServer() method. This method is executed whenever someone tries to access port 8080. In response to this, the HTTP server should display HTML and should be included in the HTTP header. It can be installed easily by typing ‘npm install -g http-server’ and it can be started by typing the http-server command.

4. Games

Not only websites but the use of JavaScript also helps in creating games for leisure. The combination of JavaScript and HTML5 makes JavaScript popular in game development as well. It provides the Ease JS library which provides simple solutions for working with rich graphics. It also has an API that is familiar to all-flash developers with a hierarchical display list. A user can create a Stage and it will render the display list to its target canvas. Ease JS also has 2D bitmaps called Sprites which are drawn directly to render the target for transformations.

Major Companies using JavaScript

1. Facebook

You’re probably aware that Facebook uses JavaScript. It’s kind of hard to miss. What’s probably not as obvious is exactly how much JavaScript goes into making Facebook and how much Facebook is involved in JavaScript development.

Try disabling JavaScript in your web browser and going to Facebook. The website will actually stop you from logging in because it won’t work without JavaScript.

You may have noticed the way that Facebook loads. Each piece of the page is separate. Facebook has invented its own way of breaking down and delivering sections of JavaScript separately. In an odd way, each section of your Facebook page is a collection of independent JavaScript applications.

It doesn’t stop there. Facebook created React, one of the most popular front end frameworks. Facebook uses React on Facebook.com as well as Instagram and WhatsApp.

2. Microsoft

Okay, so you’re probably not going to find JavaScript powering Windows anytime soon, but Microsoft relies on JavaScript for a whole lot else.

First off, Microsoft needs to work closely with JavaScript to built its Edge web browser. All browsers need 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.

Recently, Microsoft has really embraced NodeJS. They thoroughly support Node on the Azure cloud platform. Its one of Azure’s major features, and they’ve integrated Visual Studio support for Node.

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

3. Uber

Uber needs to handle loads of data in real time. They have millions of requests coming in continuously, and that’s not just hits on a page. Uber needs to track driver locations, rider locations, and incoming ride requests. It has to seamlessly sort that data and match riders as fast as possible.

All of that plays to NodeJS’s and JavaScript’s strengths. Node is designed to handle requests and hand off data quickly. It’s asynchronous capabilities are a huge part of that. Node is central to Uber’s user facing stack for just that reason.

➼ Conclusion​ :

As a result of all the above applications of JavaScript, it would be pretty clear that JavaScript is the language that is to stay. With all the features in frontend and backend development JavaScript helps in supporting both and creating some best applications that can be used worldwide.

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