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did you know that kotlin can smart cast a variable in response to calling your own functions today were going to use contracts to make that happen [Music] here Ive got a simple model for a user with this sealed class every user is one of two kinds its either an anonymous user or its an authenticated user notice that the is authenticated function is declared on the user class so its inherited by both subclasses but each subclass also has a function thats unique to it the prompt to sign in function is only available on the anonymous class and the Greet function is only available on the authenticated class now lets say weve got some kind of an app and when the screen loads we want to do one of two things first if the user is authenticated then we want to greet that user by name like welcome dave.leads if the user is anonymous then we want to prompt that user to sign in a simple approach might look like this we can check to see if the specific type of user is authenticated and when