Swift nested filter optimization?

Question

I was trying to do something in Swift that would be easy in Objective-C using KVC. The new Contacts framework added in iOS9 is for the most part easier to use than the old Addr

Answer 1

If you are looking for a more Swift-y way to do it:

let matches = contacts.filter {
    return $0.phoneNumbers
                .flatMap { $0.value as? CNPhoneNumber }
                .contains { $0.stringValue == JennysPhone }
}

.flatMap casts each member of phoneNumbers from type CNLabeledValue to type CNPhoneNumber, ignoring those that cannot be casted.

.contains checks if any of these phone numbers matches Jenny's number.