Programming in Swift: Functions & Types

Jan 4 2022 · Swift 5.5, iOS 15, Xcode 13

Part 4: Properties & Methods

33. Methods

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Previous episode: 32. Challenge: Properties Next episode: 34. Challenge: Methods

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Notes: 33. Methods

Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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You’ve already learned how to write your own methods. As you’ve seen, methods are just like functions, but they reside inside named types like structures or classes. Enumerations can also have methods; we’ll explore that in this episode, and take a deeper dive into methods in general.

32 enum Weekday: CaseIterable {

case monday, tuesday, wednesday, thursday, friday, saturday, sunday

36 Weekday.allCases

37 var weekday: Weekday = .tuesday

35 func advance(by dayCount: UInt) {

}

36 let indexOfToday = Weekday.allCases.firstIndex(of: self)!

let indexOfAdvancedDay = indexOfToday + dayCount

Int(dayCount)

39 indexOfAdvancedDay % Weekday.allCases.count

39 Weekday.allCases[indexOfAdvancedDay % Weekday.allCases.count]

35 mutating func …

39 self = Weekday…

weekday.advance(by: 6)

struct Time {
  var day: Weekday
  var hour: UInt
}

var time = Time(day: .monday, hour: 0)

51 init(day: Weekday, hour: UInt = 0) {
    self.day = day
    self.hour = hour
  }

var time = Time(day: .monday)

56 mutating func advance(byHours hourCount: UInt) {
    
  }

hour + hourCount

(hour + hourCount).quotientAndRemainder

…quotientAndRemainder(dividingBy: 24)

let (dayCount, hour) = (self.hour…

58 day.advance(by: dayCount)
    self.hour = hour

var time = Time(day: .monday)
😺time.advance(byHours: 24 * 3 + 5)🛑

62 func advanced(byHours hourCount: UInt) {

}

…) -> Time {

63 var time = self

63 time.advance(byHours: hourCount)

65 return time

67 😺let🛑 time = Time(day: .monday)
😺var advancedTime = time.advanced🛑(byHours: 24 * 3 + 5)

func advanced(byHours hourCount: UInt) -> Time {
  😺let (dayCount, hour) = (self.hour + hourCount).quotientAndRemainder(dividingBy: 24)🛑

let (dayCount, hour) = (self.hour + hourCount).quotientAndRemainder(dividingBy: 24)

😺var time = self
time.day.advance(by: dayCount)
time.hour = hour
return time🛑

56 mutating func advance(byHours hourCount: UInt) {
    self = self.advanced(byHours: hourCount)
  }

71 advancedTime.advance(byHours: 6)

struct Mathematics {
  static func getLength(x: Double, y: Double) -> Double {
  
  }
}

75 return (x * x + y * y).squareRoot()

Mathematics.getLength(x: 3, y: 4)

80 let mathematics = Mathematics()

73 enum Mathematics {