Introduction to Swift

Apr 24 2024 · Swift 5.10, iOS 17, Xcode 15

Lesson 03: Classes & Structures

Class & Struct Demo

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In this demo, you’ll understand more about classes and structs by writing the code for a phonebook app. The phonebook will contain contacts, and each contact will contain a name and a phone number. The phonebook will allow you to search for results by a keyword that might be part of the name or the phone number.

struct Contact {
  var name: String
  var phone: String
}

struct PhoneBook {
  var storedContacts: [Contact] = []

  func save(contact: Contact) {

  }

  func search(keyword: String) -> [Contact] {
    return []
  }
}

class PhoneBook {

func save(contact: Contact) {
  storedContacts.append(contact)
}

  private var storedContacts: [Contact] = []

func search(keyword: String) -> [Contact] {
  var results: [Contact] = []  //1

  for contact in storedContacts {  //2
    if contact.name.contains(keyword) ||
        contact.phone.contains(keyword) {
      results.append(contact)
    }
  }

  return results //3
}

let phoneBookInstance = PhoneBook()

let ehabContact = Contact(name: "Ehab Amer", phone: "0123456789")

init(name: String, phone: String) {
  self.name = name
  self.phone = phone
}

phoneBookInstance.save(contact: ehabContact)

phoneBookInstance.storedContacts.append(ehabContact)

let samePhoneBook = phoneBookInstance

let kodecoContact = Contact(name: "Kodeco", phone: "0112233445")
samePhoneBook.save(contact: kodecoContact)

dump(samePhoneBook.search(keyword: "01"))

dump(phoneBookInstance.search(keyword: "o"))

var kodecoContactCopy = kodecoContact
kodecoContactCopy.name = "Kodeco Copy"

print(kodecoContact.name)
print(kodecoContactCopy.name)
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