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Difference between knockout View Models declared as object literals vs functions

I am working in Knowckout MVVM framework and I am new to it. I have been using it for last one and a half months and it has been decent so far. Now, all the examples that I saw on the web and everywhere else define viewmodel as something like a Object variable with a declaration like below:

var ViewModel = {};

that was comletely understandable.BUT

lately I have seen some codemodels in which it is declared as a function:

somehting like

var ViewModel = function(){
self = this;

// some code in conventions with var member = {} instead of member:{}

}

Not only that, when the view model is actually used, they have to instantiate the viewmodel.

I see it as complete new way to represent viewmodel and I am failing to see how it is better than conventional ViewModel declaration approach.

Can someone please throw some light on this?

Answer 1

This answer explains the difference betweeen using an object literal and a function for defining a view model: Difference between knockout View Models declared as object literals vs functions