Which of the following is not a method of GlideUser (g_user)?

The correct choice highlights that userName() is not a method of GlideUser, also known as g_user. In ServiceNow, GlideUser is a client-side JavaScript object that provides methods to interact with user information and permissions.

The methods available through g_user include userID(), which retrieves the current user's ID, isMember(), which checks if the user is a member of a specific group, and hasRole(), which determines if the user has a particular role assigned. Each of these methods serves a purpose for managing and verifying user-related data within ServiceNow.

The userName() method, however, is not part of the GlideUser API. Its absence from the GlideUser context means that while you can retrieve the user's ID and check roles or group memberships, there's no direct method to get the user's name via g_user. To get a user's name, other approaches or objects may be employed, but they do not involve the GlideUser interface.

Understanding the methods associated with g_user is important for developers to efficiently interact with user data when building applications on the ServiceNow platform.