Node:Asking for the type of an object, Previous:User-defined types, Up:Getting Started
(class-of v) --> #<<class> <2D-vector> 40241ac0> <2D-vector> --> #<<class> <2D-vector> 40241ac0> (class-of 1) --> #<<class> <integer> 401b2a98> <integer> --> #<<class> <integer> 401b2a98> (is-a? v <2D-vector>) --> #t