USECASE OF JAVASCRIPT

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.

At the time, Web pages were static, offering little user interaction beyond clicking links and loading new pages. For the first time, JavaScript enabled animation, adaptive content and form validation on the page.

Execution of JavaScript

JavaScript is a scripting language, it cannot execute on its own, so we need a platform to execute it. This platform is nothing but the browser where we open the web page; browsers already have built-in execution engines. In earlier times, it was supported mainly by IE(Internet Explorer), so for many sites, there used to be a note for better performance use IE7 or so. But nowadays, all browsers support JavaScript’s, so we don’t need to bother whether our site will function properly for all browsers or it will be supported by any specific browser only. The Scripts can be executed with the help of the JavaScript engine; the presence of these engines assures execution of scripts in the browser, server, or any other device. The name for the engines differ as a browser; some browser embedded engines are called “JavaScript Virtual Machine,” while few others are listed below:

• V8 is the Google Chrome’s open-source JavaScript engine developed by Chromium Project.
• SpiderMonkey is the first engine developed by Netscape Communications.
• Nashorn, JScript, Rhino, etc. Are few other JavaScript engines.

What is JavaScript doing on Your Page?

While you accumulate a site page in your application, you are executing your code (the HTML, CSS, additionally JavaScript) inside an execution domain (the program tab). This is like a processing plant that requests in crude materials (the code) moreover yields an item (the website page). The program’s JavaScript motor executes the JavaScript following the HTML and CSS that have been amassed and set by large into a website page. This guarantees the structure and style of the page, which are now in a position when the JavaScript starts to run. This is an extraordinary point, as the truly basic utilization of JavaScript is to powerfully change HTML and CSS to recharge a UI through the Document Object Model API. On the off chance that the JavaScript stacked and proposed to keep running before the HTML and CSS were there to influence, later mistakes would happen.

JavaScript Frameworks

JavaScript (JS) frameworks are one of the most preferred platforms to build a dynamic modern application, real-time chat, eCommerce, inventory, processing, and much more. Small or enterprise, frontend or backend – JS is well suited for everything. You might have heard about the following sites which are using JavaScript.

AngularJS

AngularJS is a popular open-source front-end development framework which is mainly used for developing dynamic single-page web applications (SPA).

React

React is a library used for developing UI applications. It was released in 2013 and has been the fastest-growing JS framework in today’s world. React.js is most preferred when a high performing enterprise application needs to be delivered to its users. It is powered by user interfaces like Instagram and Facebook.

Ember.js

Ember is also an open-source framework that lets developers create a single page and large web applications. Ember has been a highly opinionated framework that was built to be very flexible.

Vue.js

Vue.js was released in 2014 and is the fastest-growing framework adopted by developers. It is a lightweight progressive JS framework that gets a lot of its concepts from ReactJS and AngularJS.

Uses of JavaScript

Javascript one of the most used languages in the market these days. Below graph shows a graphical representation of a company for all languages. JavaScript stands second in the lineup. It is mainly used in building websites and web applications. The other application of JavaScript is listed below.

• Web Development
• Web Applications
• Server Applications
• Games
• Mobile Applications

Features of JavaScript

The following characteristics of JavaScript:

• Object-Centered Script Language
• Client edge Technology
• Validation of User’s Input
• Else and If Statement
• Interpreter Centered
• Ability to perform In Built Function
• Case Sensitive format
• Light Weight and delicate
• Statements Looping
• Handling Events