Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Swift 2.0 Enumerations and Optionals Introduction to Optionals Nil Values in Collections

Posted by Anonymous User
Anonymous User
Courses Plus Student 2,204 Points

Nil Values in Collections code challenge help

Overtime i try to assign something to lead actor i get some weird error, and i tried most of the array retrieval methods, unsure of what to do.

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

var leadActor: String = ""

if let movie = movieDictionary["Spectre"], let castList = movieDictionary["cast"], let actor = movieDictionary["cast"] { leadActor = ??? }

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

var leadActor: String = ""

if let movie = movieDictionary["Spectre"], let castList = movieDictionary["cast"], let actor = movieDictionary["cast"] {
    leadActor = ???
}

1 Answer

Florin Veja
Florin Veja
6,912 Points
Florin Veja
Florin Veja
6,912 Points

Anonymous,

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

var leadActor: String = ""

// Enter code below

if let movie = movieDictionary["Spectre"], let castList = movie["cast"] {
    leadActor = castList[0]
}

Let me know if that works for you.

Florin