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

Posted by Disha Mohta
Disha Mohta
2,248 Points

A bit confused on how to approach this challenge

I watched the video twice but didn't really understand the concept and therefore don't know how to solve this challenge. Can anyone advice on how to do so?

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 leadActor  = movieDictionary["Spectre"], let cast = leadActor.cast("cast") {
leadActor.cast[0]
}

1 Answer

Joshua Walker
Joshua Walker
2,547 Points
Joshua Walker
Joshua Walker
2,547 Points

Inside your "if let" you need to assign the value from the dictionary to the variable "leadActor" with "=" like I did below. Right now your code does not assign a value to anything.

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

var leadActor: String = ""


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