knockout.js MVVM: ko.computed() widely used in template's js files

Manageing subsequent view models e.g. LoginViewModel, HomeViewModel etc. ko.computed() appears on the Scene amongst others.

 self.loading = ko.computed(function () {
        return self.view() === self.Views.Loading;
    });

 // Data
    self.Views = {
        Loading: {} // Other views are added dynamically by app.addViewModel(...).
    };

    self.view = ko.observable(self.Views.Loading);

    self.loading = ko.computed(function () {
        return self.view() === self.Views.Loading;
    });


    // Other operations
    self.addViewModel = function (options) {
        var viewItem = {},
            navigator;

        // Add view to AppViewModel.Views enum (for example, app.Views.Home).
        self.Views[options.name] = viewItem;

        // Add binding member to AppViewModel (for example, app.home);
        self[options.bindingMemberName] = ko.computed(function () {
            if (self.view() !== viewItem) {
                return null;
            }

            return new options.factory(self, dataModel);
        });

        if (typeof (options.navigatorFactory) !== "undefined") {
            navigator = options.navigatorFactory(self, dataModel);
        } else {
            navigator = function () {
                self.errors.removeAll();
                self.view(viewItem);
            };
        }

        // Add navigation member to AppViewModel (for example, app.NavigateToHome());
        self["navigateTo" + options.name] = navigator;
    };