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1. Introspection

   let date = NSDate()
   let name: AnyClass! = object_getClass(date) // __NSDate
   
   let string = "Hello"
   let name = string.dynamicType // Swift.String
   

   also:

   class MyClass { }
   
   let o : AnyObject = MyClass()
   
   print(o is String) // false
   print(o is MyClass) // true