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

Austin Hawks
PLUS
Austin Hawks
Courses Plus Student 3,003 Points
Posted by Austin Hawks
Austin Hawks
Courses Plus Student 3,003 Points

Optional Unwrapping

It says make sure I'm receiving the index at [0] in the nested array. And there aren't any error when I click on the compiler.

optionals.swift

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

var leadActor: String = ""

// Enter code below if let key = movieDictionary["Spectre"], let secondKey = key["cast"] { let leadActor = secondKey[0] }

1 Answer

jcorum
jcorum
71,830 Points

Very close. leadActor has already been declared, so it can't be declared again. And there was a missing closing curly brace:

if let key = movieDictionary["Spectre"] {
  if let secondKey = key["cast"] { 
  leadActor = secondKey[0] 
  }
}