Programming in Swift: Fundamentals

Oct 19 2021 · Swift 5.5, iOS 15, Xcode 13

Part 5: Functions & Named Types

40. Classes

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Previous episode: 39. Challenge: Structures Next episode: 41. Challenge: Classes

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Notes: 40. Classes

Update Notes: The student materials have been reviewed and are updated as of October 2021.

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Classes are a lot like Structures. They have properties, methods, and initializers. However, Classes are reference types, instead of value types. In this part of the episode, you’ll get an idea of how that affects your code.

struct Actor {
  let name: String
  var filmography: [String] = []
Actor(name: "Zoe Saldana", filmography: ["<#T##[String]#>"])
 …"Guardians of the Galaxy"])
var gotgStar = Actor(…
var starTrekStar = gotgStar
starTrekStar.filmography.append("Star Trek")
func signOnForSequel(franchiseName: String) {
mutating …
filmography.append("Upcoming \(franchiseName) sequel")
var avatarStar = starTrekStar
for franchiseName in avatarStar.filmography {
  avatarStar.signOnForSequel(franchiseName: franchiseName)
class Actor {
init(name: String, filmography: [String]) {

init(name: String, filmography: [String]) { = name = name
    self.filmography = filmography
❌mutating❌ func…
let gotgStar …

let starTrekStar …