What is Javascript? In this article, Today we will learn what is JavaScript?, Introduction, History of JavaScript, Features of JavaScript, Advantages of JavaScript, Disadvantages of JavaScript. In this post, I am going to answer some such questions related to “JavaScript.” I hope you get your answer.

JavaScript is a client-side web programming scripting language that primarily works on the principle of Object-Oriented Programming. If you want to become a web developer or web designer, then you need to learn HTML, CSS as well as JavaScript, because JavaScript is beneficial for inserting the animation

JavaScript also used to handle logical situations in a website like you make a website in HTML and designed it with CSS but using JavaScript. You can add dynamic elements like sliders, display alerts, buttons, popups to your website. It is a client-side scripting language which means that it executes on a web browser and has no connection with the server.

JavaScript is an object-oriented language, and programmers can create or delete their own objects. JavaScript is a powerful scripting language and a very lightweight programming language which makes it different from other popular programming languages ​​such as C, C++, or Java, etc.

What is JavaScript

“Hello World!” Program in JavaScript


<title>My First JavaScript File</title>
<script type="text/javascript" >
document.write("Hello World");


Hello World!

History Of Javascript

JavaScript was Develop in 1995 by Brendan Eich. Brendan Eich is the co-founder of the Mozilla Project. The first name of JavaScript was LiveScript, then Netscape changed it to JavaScript. JavaScript has a file extension .js and works in almost all well-known web browsers such as Google Chrome, Mozilla Firefox, Internet Explorer, Safari Web Browser, Opera Web Browser, Maxthon Web Browser, UC Browser, Netscape Web Browser, etc.

JavaScript Versions

  • 1.1 (August 19, 1996)
  • 1.2 (June 11, 1997)
  • 1.3 (October 19, 1998)
  • 1.4 (released in 1999 with Netscape’s server-side JavaScript)
  • 1.5 (November 14, 2000)
  • 1.6 (November 2005)
  • 1.7 (October 2006)
  • 1.8 (June 2008)
  • 1.8.1 (June 30, 2009)
  • 1.8.2 (June 22, 2009)
  • 1.8.5 (July 27, 2010)

Features Of JavaScript

  • JavaScript is an object-oriented language. However, the JavaScript handles Objects and Inheritance is slightly different from pure object-oriented programming languages ​​like Java and C ++. Because of this, JavaScript is simple to learn and use, as well as supports most Object-Oriented Concepts.
  • The JavaScript web browser is executed that means it can be run in a web browser without compiling.
  • JavaScript is case sensitive.
  • Each statement in JavaScript ends with a semicolon (;).
  • Most JavaScript control statements syntax is similar to the syntax of control statements in the C programming language.
  • An important feature of JavaScript is that it can create new functions within the script. The function declaration is made in JavaScript using the function keyword.
  • It is the lightweight scripting language.
  • It used on the client-side.
  • It’s supported by almost all popular web browsers and operating systems.
  • It can detect the user’s browser and operating system, which allows your script to perform Platform Dependent Operations if necessary.
  • It also allows for performing simple Arithmetic Calculations on the client-side.
  • JavaScript also validates the user’s input. Example like a JavaScript calculator is embedded on a website, and instead of numeric input, you try to type some characters. You will get a warning: Invalid input characters!

Advantages Of JavaScript

  • Speed: JavaScript is very fast as any function run immediately instead of connecting to the server and waiting for a reply. The JavaScript code is executed without connecting to the server, which gives it speed fast
  • Cross-Platform: It works easily in any operating system and well-known web browser. Such as Google Chrome, Mozilla Firefox, Internet Explorer, Windows operating system, Linux based OS, Linux OS, Mac OS, Ubuntu, Unix, Android, etc.
  • Simplicity: Javascript is relatively simple to learn and implement.
  • Server Load: Due to being client-side, requests on the server are reduced because JavaScript is executed in the web browser, and the load on the server is reduced.
  • Updates: Javascript continues to update from time to time.

Disadvantages Of Javascript

  • Client-Side Security: JavaScript code is executed on the users’ computers, so it has some security vulnerability.
  • Execution Vary: JavaScript can work differently on different browsers i.e., its outputs are not consistent across all platforms.
  • No Support for Network Applications: JavaScript cannot work with network applications, as there is no support available in JavaScript.


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