Introduction to JavaScript

JavaScript is a high-level, dynamic programming language primarily used for creating interactive and dynamic content on websites. It is a versatile language that enables developers to add functionality, manipulate the Document Object Model (DOM), and respond to user interactions within web browsers.

Originally created by Brendan Eich in 1995, JavaScript was initially developed for use in web browsers to enhance the user experience by allowing client-side scripts to interact with the browser, update the content dynamically, and handle user input.

JavaScript has evolved over the years and is now a key technology for both front-end and back-end web development. With the advent of server-side JavaScript platforms like Node.js, developers can use JavaScript to build entire web applications, not just the client-side functionality.

In the below PDF we discuss about Introduction to Javascript in detail in simple language, Hope this will help in better understanding.

Topics Covered inside the PDF :

  • What is Javascript?
  • History of Javascript
  • Javascript Versions
  • Features of Javascript
  • Applications of Javascript



A simple JavaScript program:

If you want to preserve your JavaScript code within the HTML document, you should use the <script> elements (<script> and </script>). This allows your browser to recognise your JavaScript code from the rest of the code. Because there are different client-side scripting languages (for example, VBScript), it is strongly advised that you specify the scripting language you use. You must utilise the type property within the <script> tag and set its value to text/javascript as follows:

The script type is “text/javascript“.

Hello World Example:

1 <html>
2 <head>
3. <title>My first javascript code</title>
4. <script >
5. Alert ("Hello World!");
6. </script>
7 </head>
8 <body>
9 </body>
10 </html>

Features of Javascript:

  1. Object-Oriented: JavaScript is an object-oriented programming language, which means it uses objects and classes to organize and structure code.
  2. Interactivity: With JavaScript, developers can create interactive elements such as forms, buttons, and sliders, allowing users to interact with web pages in real-time.
  3. Asynchronous Programming: JavaScript supports asynchronous programming, which enables non-blocking operations. This is crucial for handling tasks such as fetching data from a server without freezing the user interface.
  4. Cross-platform: JavaScript is supported by all major web browsers, making it a cross-platform language. This means that code written in JavaScript can run on various devices and operating systems.
  5. Client-Side Scripting: While JavaScript is not limited to client-side development, it gained popularity as a client-side scripting language for web browsers. It is commonly used alongside HTML and CSS to create dynamic and responsive web pages.
  6. Frameworks and Libraries: Over the years, numerous frameworks and libraries have been developed to streamline JavaScript development. Popular ones include React.js, Angular, and Vue.js.

Related Question

JavaScript is a high-level, interpreted programming language primarily used for adding interactivity to web pages. It enables developers to create dynamic and responsive user interfaces.

JavaScript is commonly used in web browsers to create interactive and dynamic content. It can also be employed on the server-side (Node.js) and in various other environments outside the web, such as mobile app development.


JavaScript is known for its lightweight, versatile nature. Key features include dynamic typing, prototype-based object-orientation, first-class functions, and the ability to manipulate the Document Object Model (DOM) for interacting with web page elements.

JavaScript code is typically embedded in HTML using the <script> tag. It can be placed either in the <head> or <body> section of an HTML document.

The Document Object Model (DOM) is a programming interface provided by browsers, allowing JavaScript to interact with the structure and content of a web page. It represents the document as a tree of objects, making it possible to manipulate and update the page dynamically.


JavaScript JSON JSON stands for

JavaScript Function Generator Function generators,

JavaScript WeakSet A WeakSet is

JavaScript WeakMap A WeakMap is

JavaScript Proxy A JavaScript Proxy

JavaScript Boolean JavaScript Boolean is

JavaScript BigInt JavaScript BigInt represented

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