Programming in Swift: Functions & Types
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Notes: 41. Challenge: Initializers
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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It’s class initializer Challenge Time! Find the challenge in the next page of the playground for this part of the course, and give the exercises your best shot. Pause the video now, and come back to compare solutions after you’re done.
39 class Animal {
var name: String
func speak() { }
}
42 required init(name: String) {
self.name = name
}
class Dog: Animal {
}
56 var tricksLearnedCount: Int
58 required init(name: String) {
<#code#>
}
58 tricksLearnedCount = 0
super.init(name: name)
speak()
override func speak() {
<#code#>
}
65 print("Bow wow! My name is \(name)!")
69 Dog(name: "Shadow")
64 init(name: String, tricksLearnedCount: Int) {
}
65 self.tricksLearnedCount = tricksLearnedCount
super.init(name: name)
speak()
58 convenience required init(name: String) {
self.init(name: name, tricksLearnedCount: 0)
tricksLearnedCount = 0
super.init(name: name)
speak()
}
58 convenience required init(name: String) {
self.init(name: name, tricksLearnedCount: 0)
}
Dog(name: "Chance", tricksLearnedCount: 3)
extension Dog {
convenience init(tricksLearnedCount: Int = .max) {
}
}
self.init(name: "Tramp", tricksLearnedCount: tricksLearnedCount)
Dog().tricksLearnedCount