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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