Swift: Enums that use closures?

Question

I’m creating an application where an unlimited amount of rules could be applied to an unlimited amount of nodes.

I\'m planning on using core data as the datastore and

Answer 1

    enum FunctionEnum
   {
     case binaryOperation((Double,Double)->Double)
     constant(Double)
   }

1.you can associate values to enum cases , hence it also has type here for example binaryOperation is of type ((Double,Double)->Double) which means its of type a closure which accepts two doubles and return one