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iOS Enumerations and Optionals in Swift Introduction to Optionals Initializing Optional Values

Zhiren Jin
Zhiren Jin
6,719 Points

Unable to complete Challenge Task

The code written bellow is perfectly compilable within the Xcode without display of any error but stated as not compilable in the code challenge, even-though no errors show up inside the Preview

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

    init?(dictionary: [String:String]) {
        guard let title = dictionary["title"], let author = dictionary["author"] else {
            return nil
        }

        self.title = title
        self.author = author
        self.price = dictionary["price"]
        self.pubDate = dictionary["pubDate"]

    }
}

1 Answer

Tassia Castro
seal-mask
.a{fill-rule:evenodd;}techdegree
Tassia Castro
iOS Development Techdegree Student 9,170 Points

Hey Zhiren,

It seems that you can't name the parameter 'dictionary'. I replaced it by dict and it worked. I think they want us to name the parameter 'dict' but they forgot to mention that.

 struct Book {
    let title: String
    let author: String
    let price: String?
    let pubDate: String?

    init?(dict: [String:String]) {
        guard let title = dict["title"], let author = dict["author"] else {
            return nil
        }

        self.title = title
        self.author = author
        self.price = dict["price"]
        self.pubDate = dict["pubDate"]

    }
}
Zhiren Jin
Zhiren Jin
6,719 Points

Thanks a lot Tassia!! I was just about to give up. Appreciated!