#high order function

[xcodeproj]

How to print digits of value in CNLabeledValue

Notice that the property stringValue of CNPhoneNumber are formatted digits.

Further string decoration via higher order function filter() is to remove any symbol containing "-", "(" or ")".

lazy var contacts: [CNContact] = { let store = CNContactStore() var containers = [CNContainer]() do { containers = try store.containersMatchingPredicate(nil) } catch let error as NSError { print(error.localizedDescription) } var contacts = [CNContact]() for container in containers { let predicate = CNContact.predicateForContactsInContainerWithIdentifier(container.identifier) let keysToFetch = [CNContactFormatter.descriptorForRequiredKeysForStyle(.FullName), CNContactPhoneNumbersKey] do { let results = try store.unifiedContactsMatchingPredicate(predicate, keysToFetch: keysToFetch) for result in results { for phoneNumber in result.phoneNumbers { guard let numberValue = phoneNumber.value as? CNPhoneNumber else { continue } print(numberValue) print(String(numberValue.stringValue.characters.filter({ !["-", "(", ")"].contains($0) }))) } } contacts.appendContentsOf(results) } catch let error as NSError { print(error.localizedDescription) } } return contacts }()