Effectively every OO language does. Inherit and override behavior. Add a piece of indirection that allows the result to specify the type of view, etc. Think of

Effectively every OO language does. Inherit and override behavior. Add a piece of indirection that allows the result to specify the type of view, etc. Think of `UserSearchResult SarchUser()` as returning either `ARealUserResult { int userId; string display = "showUserView" or `UserNotFoundResult { string display = "notFoundView" }` (you could easily add MultipleUsersMatchResult or UserRequiresAdminPrivilegesResult ...)