Programming in Swift: Functions & Types

Jan 4 2022 Swift 5.5, iOS 15, Xcode 13

Part 2: Closures

13. Challenge: Closure Syntax

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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 is challenge time again! You’ll find it on page 5 of the Playground for this part of the course. Pause the video, practice writing closures a few different ways, and then come back to check your work!

let copyLines😺_2🛑 =

let copyLines_2😺: (String, Int) -> Void🛑 = 

let copyLines_2: (String, Int) -> Void = { (offense❌: String❌, repeatCount❌: Int❌) -> Void in

 = { ❌(❌offense, repeatCount❌)❌ -> Void in

let copyLines_3:

 = { offense, repeatCount❌ -> Void❌ in

let copyLines_4: 

= { ❌offense, repeatCount❌ in

  print( String(repeating: "I must not \(😺$0).", count: 😺$1) )

copyLines("tell lies", 5)
copyLines_2("tell lies", 5)
copyLines_3("tell lies", 5)
copyLines_4("tell lies", 5)