Can anyone explain namespace in javascript with an example?

Question

I am bit confused with namespaces of function in javascript. Can I have function with same names?

Thanks

Answer 1

There is no official concept of a namespace in Javascript like there is in C++. However, you can wrap functions in Javascript objects to emulate namespaces. For example, if you wanted to write a function in a "namespace" called MyNamespace, you might do the following:

var MyNamespace = {};

MyNamespace.myFunction = function(arg1, arg2) {
    // do things here
};

MyNamespace.myOtherFunction = function() {
    // do other things here
};

Then, to call those functions, you would write MyNamespace.myFunction(somearg, someotherarg); and MyNamespace.myOtherFunction();.

I should also mention that there are many different ways to do namespacing and class-like things in Javascript. My method is just one of those many.

For more discussion, you might also want to take a look at this question.

Answer 2

http://www.dustindiaz.com/namespace-your-javascript/ has some good examples on this.

Answer 3

JavaScript doesn't have the concept of namespace. If you see something like System.Array, the code is referring to an object Array that is a property of the object System.

The object System could be also a function, but a function is normally used when there is the need to allocated an object, and that function would became the object constructor.
If System.Array is a function then you could write something like

new_array = new System.Array(10, 20, 30);

The example is pretty useless, as JavaScript already has array objects.

Answer 4

Currently, no JavaScript implementations support namespaces, if you're referring to ECMAScript 6/JavaScript 2 namespaces.

If you're referring to how namespacing is done today, it's just the use of one object and putting every method you want to define onto it.

var myNamespace = {};
myNamespace.foo = function () { /*...*/ };
myNamespace.bar = function () { /*...*/ };