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 Initializing Optional Values

Compiler errors on failable initializer

I am getting compiler errors on this. I'm trying to copy emulate the code found here

https://teamtreehouse.com/library/swift-20-enumerations-and-optionals/introduction-to-optionals/early-exits-using-guard

at 4:35, but the compiler keeps giving me problems with the guard statement. I feel like this is a syntax error, but the errors keep recommending "where" statements, which I've never heard of, or use of the !, which the lesson explicitly instructed against using. So I'm a little lost. Any help at all would be appreciated. Thanks!

optionals.swift
struct Book {
    let title: String
    let author: String
    let price: String?
    let pubDate: String?

    init?(dict: [String: String]) {

      guard let self.title = dict["title"], self.author = dict["author"] else {
        return nil
      }

      self.price = dict["price"]
      self.pubDate = dict["pubDate"]
    }
}

1 Answer

Hi everyone. I apologize for the duplicate. This question is answered here and I have passed the challenge.

https://teamtreehouse.com/community/i-dont-see-how-a-dictionary-thats-passed-into-the-initializer-can-contain-both-the-title-and-the-author