Creates a knockout viewmodel from a regular object

createFrom.js

/*
  Usage:
  var viewModel = createFrom(regularObject);

  To update the viewmodel:
  viewModel.updateFrom(newRegularObject);
*/

  var createFrom = function(source, destination, isNested) {
    if (!destination) destination = {};
    for (var prop in source) {
      if (typeof source[prop] == "object") {
        if (typeof destination[prop] == "undefined") {
          destination[prop] = {};
        }
        createFrom(source[prop], destination[prop], true);
      } else {
        if (typeof destination[prop] == "undefined") {
          destination[prop] = ko.observable(source[prop]);
        } else {
          destination[prop](source[prop]);
        }
      }
    }

    if (!isNested) {
      if (typeof destination.updateFrom == "undefined") {
        destination.updateFrom = function(source) {
          createFrom(source, destination);
        }
      }
    }
    return destination;
  };