Last Updated on April 1, 2018 by

JavaScript is a programming language. JavaScript was developed by Brendon Eich while working at Netscape. It’s an interpreted language which means that it doesn’t need to be compiled. Mostly, it is used to add functionality to the website and to make the website responsive in terms of interacting according to the user’s actions. JavaScript is a browser implemented programming language.  Unlike HTML and CSS, it runs on the Clients browser rather than the server of the webpage. JavaScript is a light weight language called a “Scripting” language which is easily processed by a web browser. Programming isn’t done on the web browsers. JavaScript codes can be written in any word processor application. Modern browsers contain JavaScript engines embedded in them.

JavaScript is a high-level language and is categorized with languages like C and C++. JavaScript is not java or a sub branch of the java language. Like other languages JavaScript is capable of working with variables, datatypes, data structures, arrays, strings and objects. By using JavaScript, you can make webpages responsive, add content in an HTML document, detect what kind of browsers and operating systems your users are using, create animations, slideshows, scrollers and minimal graphic design stuff or you can take a step further and start creating apps by using JavaScript frameworks like Angular, Backbone, React etc. You can create cookies which are capable of with holding a certain amount of data. This is very important for a freelance web designer singapore that requires tracking of customer details and conversion data.

JavaScript’s program or code can be added to a website by both ways. It can either be written in a separate file and then linked with the webpage through HTML or it can be placed in the body of the HTML file. It works both ways. Linking JavaScript externally creates a more organized and easily editable JavaScript code. To include JavaScript in a HTML document, or linking an external file, opening and closing “script” tags are used. For Example,

var Number1 = 35;
var Number2 = 40;



As you can see by using the following JavaScript program in your HTML it will give you a result by adding the two numbers together. This is the most basic interpretation of how JavaScript works. JavaScript doesn’t process instructions on its own. As a matter of fact, it tells the browser what to do. Most browsers have JavaScript engines that execute the instructions the language merely provides the instructions for that engine. As you move towards advanced knowledge about JavaScript you will come to know about more complex programs and techniques.

However, JavaScript has certain consequences regarding security. When someone requests a webpage, they don’t know what the HTML contains. It may or may not have JavaScript. The problem is with pages that contain JavaScript, when requested by user will automatically process them. This creates a vulnerability for online security because JavaScript doesn’t ask for permission to be executed. You can easily attach a virus to a JavaScript and it will pass all kinds of barriers and infect your system. That’s why some sites are automatically blocked or restricted by the browsers.