#high order function

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 }()