Programming in Swift: Functions & Types

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

Part 2: Closures

16. Challenge: Closures & Collections

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Previous episode: 15. compactMap & flatMap Next episode: 17. filter, reduce, & sort

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Notes: 16. Challenge: Closures & Collections

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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I’ve got another challenge for you! This time you’ll try out using forEach, map, compactMap, and flatMap on your own.

students.forEach

students.forEach { (<#Student#>) in
  <#code#>
}

students.forEach { (student) in

student.earnExtraCredit()

let classLibraryBooks = 

let classLibraryBooks = students.map { (<#Student#>) -> T in
  <#code#>
}

students.map { (student)

-> [String]

student.libraryBooks

print(classLibraryBooks)

let classPets = 

students.compactMap {...

{ (student) -> String? in

student.pet

{ ❌(student) -> String? in❌
  $0.pet
}

classLibraryBooks.flatMap { $0 }

let classLibraryBooks = students.map { (student) -> [String] in
  student.libraryBooks
}
print(classLibraryBooks)

let classLibraryBooks = students.flatMap