JavaScript:- Industry Use-cases

Objective

In this article , we will learn about the JavaScript and the use-cases of JavaScript. How Industries utilizes the JavaScript to empower their business.

JavaScript

• JavaScript is a loosely-typed client-side scripting language that executes in the user’s browser. JavaScript interacts with HTML elements (DOM elements) in order to make an interactive web user interface.
• JavaScript is a dynamic programming language that’s used for web development, in web applications, for game development, and lots more. It allows you to implement dynamic features on web pages that cannot be done with only HTML and CSS.

• JavaScript is a high-level ,interpreted, object-oriented Programming language. It is one of core of the web technologies along HTML and CSS.
• 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.
• Common examples of JavaScript that you might use every day include the search box on Amazon, a news recap video embedded on The New York Times, or refreshing your Twitter feed.

History of JavaScript

Brendan Eich developed JavaScript in 1995?while working for Netscape Communications, Java, Scheme, and Self, inspired it. As Microsoft became a mortal threat, Netscape started the process of standardization to prevent Microsoft from gaining access to JavaScript. They also partnered with Sun Microsystems (usually called Sun) to break the Microsoft monopoly.

Though Java and JavaScript sound similar, they are not alike. They have very different syntax, semantics, and uses. The only thing in common is that both are trademarks or registered trademarks of Oracle in the U.S. and other countries.

Why should we use JavaScript?

Although we have many client languages for the browser for HTML manipulation like VBScript and coffee-script, why we mainly use JavaScript? Why it’s a born winner? Why not replace JAVASCRIPT with other scripting languages? The reasons are

??It is what every other browser supports.

??Most of the client languages they built use JavaScript as an intermediate.

??It is easy to learn compared to other scripting languages.

Uses of JavaScript

JavaScript is one?of the most used languages in the market these days. It is mainly used in?building websites?and web applications. There are some places where JavaScript is highly popular.

1. Web Development

• JavaScript is a?client scripting language?which 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 for flash applications etc. It can also load content into a document whenever the user requires it without even reloading the entire page.

2. Web Applications

• With technology browsers and personal computers have improved to the extent that a language was required to?create robust web applications. When a user explores a?map in Google Maps?then the user just needs to click and drag the mouse. All detailed view is visible by just a click. This is possible due to JavaScript.

• It interacts with the browser without sending messages to and fro to the servers. JavaScript uses Application Programming Interfaces(APIs) that provide extra powers to the code.

3. Presentations

• JavaScript also provides the facility of creating presentations as a website. JavaScript provides RevealJS and BespokeJS libraries to build a web-based slide deck. Reveal.js creates some of the most beautiful and interactive decks using HTML.
• A user can easily insert nested slides. Even if the user is not aware of programming language then they can easily build a site with so much help online. These presentations are touch optimized and work great with mobile devices, phones, and tablets.
• With all this JavaScript also provides different transition styles, themes, and slide backgrounds.?It supports all CSS color formats. JavaScript also provides Bespoke.js plugin with a wide variety of features. These include responsive scaling, animated bullet lists, and syntax highlighting for code .
• It provides themes which are polished and not too flashy. The quickest way to start Bespoke.js is using a generator. It allows the user to set titles to your presentation and go through a set of questions to get the plugins required.

4. 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 transfers 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 HTTP header.

5. Games

• Not only websites but uses of JavaScript also helps in creating games for leisure. The combination of?JavaScript and HTML5?makes JavaScript popular in games 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.

Advantages of JavaScript

The merits of using JavaScript are ?

• Less server interaction?? You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.
• Immediate feedback to the visitors?? They don’t have to wait for a page reload to see if they have forgotten to enter something.
• Increased interactivity?? You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.
• Richer interfaces?? You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.
• Websites —?Obvious, this is why we invented this language. In websites, it is used to add interactivity to HTML elements.
• Server Applications —?Node.js changed the way we use JavaScript. Now this language is used in building server. Node.js capability to build scalable web apps.
• Mobile Apps —?React Native is used to creating mobile apps with JavaScript.
• Smartwatch apps —?React Native is used to creating mobile apps with JavaScript.
• Robots and IoT–?Yes, you’ve read that right. With a minimal OS, NodeJS can be installed and this means you can use JavaScript environment to code Robots.
• Johnny-Five —?For robotics and IoT Platform
• Cylon JS —?Robotics kit
• Games —?You can use any language to code a game. But with HTML5 canvas and JavaScript as browser-based games will be super cool.
• Machine learning —?With AI being state of the art on current technologies, how can JavaScript stay out of the ring?

Features of JavaScript :

• JavaScript is a object-based scripting language.
• Giving the user more control over the browser.
• It Handling dates and time.
• It Detecting the user’s browser and OS,
• It is light weighted.
• JavaScript is a scripting language and it is not java.
• JavaScript is interpreter based scripting language.
• JavaScript is case sensitive.
• JavaScript is object based language as it provides predefined objects.
• Every statement in JavaScript must be terminated with semicolon (;).
• Most of the JavaScript control statements syntax is same as syntax of control statements in C language.
• An important part of JavaScript is the ability to create new functions within scripts. Declare a function in JavaScript using function keyword.

Popular JavaScript Framework

1. Angular :?Angular is a TypeScript-based open-source web application framework led by the Angular Team at Google and by a community of individuals and corporations. Angular is a complete rewrite from the same team that built AngularJS.

2. React :?React is an open-source front-end JavaScript library for building user interfaces or UI components. It is maintained by Facebook and a community of individual developers and companies. React can be used as a base in the development of single-page or mobile applications.

3. jQuery :?jQuery is a JavaScript library designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax. It is free, open-source software using the permissive MIT License. As of May 2019, jQuery is used by 73% of the 10 million most popular websites.

4. Vue.js :?Vue.js is an open-source model–view–viewmodel front end JavaScript framework for building user interfaces and single-page applications. It was created by Evan You, and is maintained by him and the rest of the active core team members.

5.Backbone :?Backbone.js is a JavaScript library with a RESTful JSON interface and is based on the model–view–controller application design paradigm. Backbone is known for being lightweight, as its only hard dependency is on one JavaScript library, Underscore.js, plus jQuery for use of the full library.

More JavaScript Frameworks : Node, Ember, Meteor, Polymer, Aurelia ,etc. Every Framework has it’s own specialty.

Google and JavaScript

Google develops and usually open sources it’s own JavaScript tools. The most obvious example is AngularJS. Angular is used most prominently in Google’s DoubleClick advertising platform, but it’s also one of the most popular front end frameworks available. It’s even part of the MEAN stack.

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

Working of Googlebot

Googlebot then queues the page for rendering. As soon as possible, a headless Chromium instance renders the page, which includes?JavaScript?execution.?Googlebot uses?the rendered HTML to index the page. Your technical setup can influence the process of crawling, rendering, and indexing.

The process works like this:

1. Googlebot queues URLs for crawling.
2. It then fetches the URLs with an HTTP request based on the?crawl budget.
3. Googlebot scans the HTML for links and queues the discovered links for crawling.
4. Googlebot then queues the page for rendering.
5. As soon as possible, a headless Chromium instance renders the page, which includes JavaScript execution.
6. Googlebot uses the rendered HTML to index the page.

Your technical setup can influence the process of crawling, rendering, and indexing. For example, slow response times or server errors can impact the?crawl budget. Another example would be requiring JavaScript to render the links can lead to a slower discovery of these links.

Conclusion

JavaScript is so popular due to the beautiful look and feel and it gives ability to user to interact with browser. Also the framework of JavaScript makes so easy to use JavaScript . Now NodeJS has become the number one choice among developers as well as companies for building modern web applications.

However, you should not use NodeJS if you’re developing a CPU-intensive web application as it may cause unresponsiveness due to its single-threaded nature. On the other hand, NodeJS is the best choice if your web app involves dealing with heavy client-side rendering, frequent shuffling of data, multiple concurrent requests, and things .

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