Getting the Account Display Name in Windows 10 Apps using JavaScript

function returnDisplayNameAC() {
// Check if the privacy settings in Windows 10 allows the apps to get the name
        if (Windows.System.UserProfile.UserInformation.nameAccessAllowed) {
            Windows.System.UserProfile.UserInformation.getDisplayNameAsync().done(function (returnData) {
                if (returnData) {
                    return returnData;
                } 
            });
        } else {
            return "Access to name is disabled by Privacy Setting or Group Policy of your Windows";
        }
    }