Check if an object is an instance of a given class or of a subclass of it

Question

Is there an easy way to do this in Smalltalk? I'm 80% sure that there is some method but can't find it anywhere.

I know that I can use

(instance class = SomeClass) ifTrue:

And I know that I can use superclass etc... but I hope that there is something built in :)

Answer 1

To test whether anObject is instance of aClass:

(anObject isMemberOf: aClass)

To test whether it is an instance of aClass or one of it subclasses:

(anObject isKindOf: aClass)