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iOS Enumerations and Optionals in Swift Introduction to Optionals Nil Values in Collections

Posted by Shilpa Brahme
Shilpa Brahme
142 Points

Need help with optional; chaining syntax

optionals.swift 
let movieDictionary = ["Spectre": ["cast": ["Daniel Craig", "Christoph Waltz", "Léa Seydoux", "Ralph Fiennes", "Monica Bellucci", "Naomie Harris"]]]

var leadActor: String?

// Enter code below
if let castDict = movieDictionary["Spectre"], let actorArray = castDict["cast"], let leadActor = actorArray?[0] {
  print(leadActor)
}

1 Answer

Rafał Małczyński
Rafał Małczyński
15,699 Points
Rafał Małczyński
Rafał Małczyński
15,699 Points

That's the way to do it:

if let movieDict = movieDictionary["Spectre"], let movieCast = movieDict["cast"]{
  leadActor = movieCast[0]
}