gistfile1.txt

var koProvider = {
    observable: function () {
        return ko.observable();
    },
    computed: function (func)
    {
        return ko.computed(func);
    }
}

var variableProvider = {
    observable: function () {
        var variable;
        return function (val)
        {
            if (val) variable = val;
            return variable;
        }
    },
    computed: function (func)
    {
        return function() {
            return func()
        };
    }
}

window.ViewModel = {};
window.ViewModel.New = function (provider) {

    var price = provider.observable();
    var discountPercentage = provider.observable();

    var init = function(_price, _discountPercentage)
    {
        price(_price);
        discountPercentage(_discountPercentage);
    }

    var getRealPrice = provider.computed(function() {
        return price() * discountPercentage();
    });

    // Public members
    var model = {};

    // Properties
    model.Price = price;
    model.DiscountPercentage = discountPercentage;

    // Methods
    model.init = init;
    model.getRealPrice = getRealPrice;

    return model;
}

// This is now equivilent of C# constructor\initialiser
var viewModel = window.ViewModel.New(koProvider)
                    .init(120, 50);