Defining Namespace or Nested Objects in JavaScript

JavaScript is a dynamic language. You can create objects on the fly, and objects can contain other objects, also it does not support the concept of namespace like C#.

Basically, a namespace is like a container which contains classes. In JavaScript you can achieve the same functionality as Namespace by creating nested objects. And since window itself is an object you can actually create objects directly into it. But if we would like to create an object in a non-existent nested namespace, we'll need to create that first.

<script>
var MyNameSpace = {
 calculateVat: function (base) {
 return base * 1.21;
 },
 product: function (price) {
 this.price = price;
 this.getPrice = function () {
 return this.price;
 };
 },
 doCalculations: function () {
 var p = new MyNameSpace.product(100);
 alert(this.calculateVat(p.getPrice()));
 }
}
//instancing product class
var p = new MyNameSpace.product(150);
//calling product class method
alert(p.getPrice());
</script>

Namespaces Nesting

<script>
var MyNameSpace = {
 calculateVat: function (base) {
 return base * 1.21;
 },
 MyNameSpace2: {
 product: function (price) {
 this.price = price;
 this.getPrice = function () {
 return this.price;
 };
 }
 },
 doCalculations: function () {
 var p = new MyNameSpace.product(100);
 alert(this.calculateVat(p.getPrice()));
 }
}
//instancing product class
var p = new MyNameSpace.MyNameSpace2.product(150);
//calling product class method
alert(p.getPrice());
</script>

What do you think?

I hope you will enjoy the namespace while programming with javascript. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.

Further Reading