Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

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

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

That's the way to do it:

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