Introduction To JavaScript

What Is JavaScript

JavaScript(Js) is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting procedural, object-oriented, imperative, and declarative (e.g. functional programming) styles.
It is an interpreted, full-fledged programming language that enables dynamic interactivity on websites when applied to an HTML document. It was introduced in the year 1995 for adding programs to the webpages in the Netscape Navigator browser. Since then, it has been adopted by all other graphical web browsers. With JavaScript, users can build modern web applications to interact directly without reloading the page every time. The traditional website uses js to provide several forms of interactivity and simplicity.
Although, JavaScript has no connectivity with Java programming language. The name was suggested and provided in the times when Java was gaining popularity in the market. In addition to web browsers, databases such as CouchDB and MongoDB uses JavaScript as their scripting and query language.

Features of JavaScript

There are following features of JavaScript:

1. All popular web browsers support JavaScript as they provide built-in execution environments.
2. JavaScript follows the syntax and structure of the C programming language. Thus, it is a structured programming language.
3. JavaScript is a weakly typed language, where certain types are implicitly cast (depending on the operation).
4. JavaScript is an object-oriented programming language that uses prototypes rather than using classes for inheritance.
5. It is a light-weighted and interpreted language.
6. It is a case-sensitive language.
7. JavaScript is supportable in several operating systems including, Windows, macOS, etc.
8. It provides good control to the users over the web browsers.

History of JavaScript

In 1993, Mosaic, the first popular web browser, came into existence. In the year 1994, Netscape **was founded by **Marc Andreessen. He realized that the web needed to become more dynamic. Thus, a 'glue language' was believed to be provided to HTML to make web designing easy for designers and part-time programmers. Consequently, in 1995, the company recruited Brendan Eich intending to implement and embed Scheme programming language to the browser. But, before Brendan could start, the company merged with Sun Microsystems for adding Java into its Navigator so that it could compete with Microsoft over the web technologies and platforms. Now, two languages were there: Java and the scripting language. Further, Netscape decided to give a similar name to the scripting language as Java's. It led to 'Javascript'. Finally, in May 1995, Marc Andreessen coined the first code of Javascript named 'Mocha'. Later, the marketing team replaced the name with 'LiveScript'. But, due to trademark reasons and certain other reasons, in December 1995, the language was finally renamed to 'JavaScript'. From then, JavaScript came into existence.

Application of JavaScript

JavaScript is used to create interactive websites. It is mainly used for:

• Client-side validation,
• Dynamic drop-down menus,
• Displaying date and time,
• Displaying pop-up windows and dialog boxes (like an alert dialog box, confirm dialog box and prompt dialog box),
• Displaying clocks etc.

Source Code :- https://github.com/kavya-rgb/JavaScript-Learning

Comments

[JoelBonetR 🥇]

I feel the need to clarify some concepts just in case;

Features of JavaScript

JavaScript is NOT -just- an Object Oriented Language (from the programming paradigm point of view), that's a common misconception;
While the language implementation follows the "everything is an Object" pattern (like python and many others) it is a different topic.
You can sure use the OOP paradigm in JavaScript the same way you can use any other and/or mix them all.

JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting procedural, object-oriented, imperative, and declarative (e.g. functional programming) styles.

On the other hand JavaScript's name and C-like syntax, including curly braces and the clunky for statement, makes it appear to be an ordinary procedural language. This is misleading because JavaScript has more in common with functional languages like Lisp or Scheme than with C or Java.

See the JavaScript Reference for more details on that.

Application of JavaScript

JavaScript can run wherever it is a JS RE (JavaScript Runtime Environment), this can be (Node, Deno, Bun...) or every single browser, a good example outside the web is using Node in a Raspberry Pi or Electron JS which make use of Node and Chromium to provide a RE for desktop Apps.

While it started as a narrow DSL (Domain Specific Language) it headed step by step to a general-purpose-like language.
It will never (probably) reach a general purpose equivalent to C (e.g. even you can find JavaScript Based OS concept, it still needs to rely on C and/or C++ behind the scenes to provide low-level APIs).

Hope it helps somehow, till the next time!

[Kavya-RGB]

The Following Changes which your described were made successfully, Again Thanks For Correcting Me.

[Kavya-RGB]

Thanks, I will look into my post and edit it.

[seneargroup]

Javascript is a object oriented programming language only except it doesn't not support polymorphism

[JoelBonetR 🥇]

It is a prototype-based Object Oriented language from the language implementation point of view. It must not be confused with a pure OO language like SmallTalk as Js is not pure OO from any point of view.

JavaScript does support primitives (you don't want that in pure OO).
Also it doesn't implement polymorphism neither it has abstract classes, which are requirements for a language to apply a complete OO implementation.

Every single one of the following sentences is true from the core API point of view:

• JS is an Object Oriented Language
• JS is a procedural language
• JS is a functional language
• JS is an imperative language
• JS is a declarative language

but they are inexact, because if you apply logic to those sentences each one can be exclusive (if it is an object oriented language, it cannot be another thing)

So to be more exact we say that JavaScript is a multi-paradigm language, which means that you can use any paradigm with it.

Because JS implements all of them (multi-paradigm), it is your project the one that will sit on one or more of those categories depending on your software design and implementation.

See the reference

Excerpt from the language reference:

JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles.