JavaScript is one of the world’s most revolutionary programming language, invented by Brendan Eich (co-founder of Mozilla) in 1995. To give you an idea of how important it is, you have to realize that without JavaScript, the internet would have been a boring set of pages with plain information, JavaScript development enables you to add interactive functionalities on a regular website and make it an interesting one. Nowadays, all modern web browsers are designed to support JavaScript integration what’s why companies are rushing to Hire Javascript Developers. It has become so popular because front end development services convert a simple web page into a user interactive website by adding responses to buttons, games, animation, image galleries, dynamic styling, etc.

The JavaScript language works well with any back-end language, so it is widely used across several browsers and platforms without having any issues. That’s why JavaScript web development solution is on the priority list of most of the IT companies and its usage is continuously increasing in the field of web development. The main purpose to write this blog post is to discuss all the basics concepts of JavaScript and to give a better understanding of this exciting language. If you are new to JavaScript but enjoy playing with code and is thinking of ‘where to start’. Read on as this article covers the fundamental concepts of JavaScript which any programmer must be aware of.

What Is JavaScript?

The JavaScript language is a client-side scripting language that provides better user interactivity, especially when added with HTML (Hypertext Markup Language) web-pages. Here, I am saying- ‘client-side’ which means that it only runs on a user-side web browser, unlike the server-side scripting languages that are used to do coding at the server-side. Actually, it works in such a fashion in which firstly, the HTML web-pages are served by the server. After that those pages get loaded on the web browser of the web-user. The JavaScript language lets the web-user add the user interactivity within those loaded HTML web-pages. Hence, it enables more powerful user interaction within the website.

Example: Google Maps is one of the best examples of JavaScript development. You can zoom in and out to any specific place. You don’t even need to refresh the web page every time whenever you’ll search for here and there. On the other hand, if you don’t use the JavaScript language then obviously you need to refresh your web page again and again after each user interaction unless you start using plug-ins like Adobe Flash, Microsoft Silverlight, etc. With JavaScript language, you don’t need to use plug-ins.

Note: JavaScript is not the same as Java.

Yes, you are hearing it right. JavaScript is not like Java. Java is a core programming language that is tougher to learn whereas JavaScript is a client-side scripting language that adds user-interactivity within HTML web-pages on the internet. Also, JavaScript is easier to learn as compared to Java.

JavaScript Development - Semidot Infotech

The JavaScript Syntax

Generally, good companies are always looking to hire Full Stack Web Developers for their web/app development which can cover their JavaScript requirements along with others. That’s why you can see that there are numerous companies that provide the Front End Development Services to their clients.

If you are a beginner who wants to learn JavaScript code then roll-up your sleeves now. This tutorial surely helps you to write-up something amazing in JavaScript.

Before writing your first JavaScript code, here are few basics of the JavaScript language that you must be aware of:

  • Write all your code inside the script tags (to include your JavaScript code within HTML files). And also include text/javascript type attribute at the beginning of the code. For example:

<script type=”text/javascript”>

Write the code here



To hide any part of JavaScript code from your browser (in case, a browser doesn’t support it), write the JavaScript code inside the tags something like-

<script type=”text/javascript”>


Write the code that you want to hide from your browser here



  • The JavaScript language is case-sensitive.
  • Use semicolon at the end of each JavaScript statement.
  • The variable names must start with a letter or underscore.
  • Write the comment to identify the script by using the double slash (//) at the beginning of the comment line.
  • Anything you put inside stars doesn’t run while execution. So for comment-out any part of the script, you should write your script between starts like ->

/* Write the script here that you don’t want to run during execution*/

How To Include An External JavaScript Files in An HTML Web-Page?

The most common way to include JavaScript code to your HTML web-page is to add it as external JavaScript files using the “src” attribute in your scripting tags.

Write your script tag in a manner like:

<script type=”text/javascript” src=”write the path of external Javascript file where it has stored in your computer”></script>


Your First “Welcome To JavaScript Development World” Example

  • Open your target web-page and create a new folder here. Give this folder a proper name. For example, you have given it a name- ‘firstscript’ (Don’t put any quotes around the folder name while saving it.).
  • Now create a file inside this folder, named as ‘js’, and save it.
  • Next step is to add this JavaScript code file within the HTML file. Type the following code before the closing body tag, ‘</body>’:

<script src=”firstscript/mainfile.js”></script>

  • Write the code inside the HTML file named ‘mainfile.js’:

var myHeading = document.querySelector(‘h1’);

myHeading.textContent = ‘Welcome To JavaScript Development World!’;

  • Lastly, save the JavaScript and the HTML files. Open your web browser and load the HTML file there. You’ll get run your first JavaScript code included with the HTML file.


Hopefully, you have scratched up the surface of JavaScript development basics. If you are a good learner who loves to play with codes then you can head to other important topics such as variables, operators, conditionals, functions, events, etc. A clear understanding of these fundamentals of JavaScript will create a solid foundation for becoming a successful JavaScript programmer.

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