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

Bastian Petersson
Bastian Petersson
9,164 Points
Posted by Bastian Petersson
Bastian Petersson
9,164 Points

HELP!!! Optionals

I find Optionals hard to work with and can't crack this task. Can anyone please help me?

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

    init?(dict: [String : String]) {
        if let title = dict["title"], let author = dict["author"] {
            let price = dict["price"]
            let pubDate = dict["pubDate"]

            self.title = title
            self.author = author
            self.price = price
            self.pubDate = pubDate

        } else {
            self.title = title
            self.author = author
            self.price = nil
            self.pubDate = nil
            }
}
}

1 Answer

Frederick Andersen
Frederick Andersen
1,756 Points
Frederick Andersen
Frederick Andersen
1,756 Points

Hey man,

You need to use the guard-statement you learned in the previous video.

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"]
    }
}