Singleton with Deffered to use a cookie or get the info from an endpoint

gistfile1.js

ClientInfo = ( function ( ) {

	// Instance stores a reference to the Singleton
	var instance;
	var obj = { };

	function init ( currentUserRegion ) {
		var publicMethods = {
			getRegionalCurrency : function ( ) {
				return obj.rcd;
			},
			getProjectView : function ( ) {
				return obj.projectView === null ? "list" : obj.projectView;
			},
			setProjectView : function ( value ) {
				obj.projectView = value;
			},
			Save : function ( ) {
				SetCookie ( Constants.ContextCookieName, JSON.stringify ( obj ) );
			}
		};

		var def = $.Deferred ( );

		var cookie = GetCookie ( Constants.ContextCookieName );
		var regionsURI = "/Regions?$filter=RegionName%20eq%20%27" + currentUserRegion + "%27&$select=ISOCurrencyCode";

		if ( cookie === null || cookie === "" ) {
			var endpointUrl = Context.GetInformationApiMethodUrl ( regionsURI );

			Context.GetJSONFromDataHub (
				endpointUrl,
				function ( data ) {
					obj.rcd = data.value [ 0 ].ISOCurrencyCode;
					obj.projectView = "list"; // default
					def.resolve ( publicMethods );
				},
				function ( err ) {
					logger.Error ( "Error calling Information.svc", "Connections", "LoadPage", err );
					def.reject ( "Error calling Information.svc" );
				} );
		} else {
			obj = JSON.parse ( cookie );
			def.resolve ( publicMethods );
		}

		return def;
	}

	return {
		// Get the Singleton instance if one exists
		// or create one if it doesn't
		getInstance : function ( currentUserRegion ) {
			if ( !instance ) {
				instance = init ( currentUserRegion );
			}
			return instance;
		}
	};

} ) ( ClientInfo || { } );

gistfile2.js

	$ ( document ).ready ( function ( ) {
		// the plus "" is useful to don't get an error with plugins like resharper
		var currentUserRegion = @Html.Raw( Json.Encode ( ViewBag.CurrentUserRegion ) ) + "";
 
		var ctx = ClientInfo.getInstance ( currentUserRegion );
 
		ctx.then ( function ( ci ) {
			var currency = ci.getRegionalCurrency ( );
			$ ( "#currency" ).text ( currency );
		} );
	} );