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

Posted by Marko Sabec
Marko Sabec
27,828 Points

Does not work

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

if let movie = movieDictionary["cast"], var leadActor: String = movie[0] { print() }

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


if let movie = movieDictionary["cast"], 
  var leadActor: String = movie[0] {
    print()
  }

// Enter code below

1 Answer

Marc Jones
Marc Jones
3,751 Points
Marc Jones
Marc Jones
3,751 Points

Hi,

I believe you problem is that you need to check that the outer array contains a value first, 

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]
}

Try the above and let me know how you get on.

Marc