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What is JavaScript? Functions, Advantages, and Disadvantages

Hastin Lia • 25 Juni 2024 - 3 Min min read | English


If you are familiar with the world of programming, you must have heard of JavaScript. It’s a programming language used to make websites more dynamic and interactive. In this article, we will take an in-depth look at JavaScript, including its history, functions, and advantages and disadvantages.

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History of JavaScript

JavaScript, created by Brendan Eich in 1995 for Netscape, originally resembled Java for browsers. In 10 days, Eich combined features of Java, Scheme, and Self, creating Mocha (client-side and server-side). Mocha was renamed LiveScript and LiveWire. Netscape collaborated with Sun Microsystems, releasing LiveScript as JavaScript in Navigator 2. The success of JavaScript 1.0 was followed by the development of version 1.1 in Navigator 3. Microsoft introduced JScript in Internet Explorer 3 a few months later, as the JavaScript trademark was owned by Sun and Netscape. Although similar, JScript has additional features so it is not fully compatible with JavaScript.

Functions of JavaScript

JavaScript has several main functions in website development. Here are some of them:

1. Making the Website Interactive

One of its main functions is to make websites more interactive. You can create website content that can move and change without having to reload the page manually. For example, you can create slideshows, polls, or other dynamic content that will make visitors feel at home visiting your website.

2. Developing Mobile Applications

Besides being used for website development, it is also widely used in making mobile applications. With the existence of specialized JavaScript frameworks for mobile applications such as React Native, developers can more easily create applications that can run on Android and iOS operating systems simultaneously.

3. Creating Web-based Games

If you’ve ever played an online game through a browser, chances are it was created using JavaScript. With specialized frameworks like Panda.js and Playground.js, game development in JavaScript is getting easier and faster.

4. Running a Web Server

Besides working on the frontend/browser side, JavaScript can also be run on the server side with the help of Node.js. With Node.js, you can use it to develop various types of applications such as servers, desktop applications, mobile applications, and other.

Pros and Cons of JavaScript

Like any other programming language, JavaScript has advantages and disadvantages. The following are some of its advantages and disadvantages:


  • An easy programming language to learn, especially for beginners. The syntax and code writing are quite simple and easy to understand.
  • Flexible, which can be used for various types of applications, both on the frontend and backend. With Node.js, JavaScript can also be run on the server side.
  • Interactive and responsive web pages. Users can interact with website content in a more interesting and convenient way.
  • Multiplatform and Cross-browser, which can be implemented on various operating systems and almost all browsers support JavaScript. So it is very flexible in web application development.


  • Security Issues, mainly because JavaScript code is visible to anyone visiting the web page. This makes JavaScript code vulnerable to exploitation if not implemented properly.
  • Limitations of Objects that can be used. This affects the features available in this programming language.
  • Not Suitable for Standalone App Development. To create an application with JavaScript, you also need another programming language such as HTML.

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With JavaScript, you can create website content that moves and changes automatically, develop mobile applications, create web-based games, and run web servers. It has advantages such as being easy to learn, flexible, interactive, and responsive. However, it also has disadvantages such as security issues and object limitations. If you want to learn it, make sure you use fast and secure hosting so that your website is reliable. Happy learning and success in website development!

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