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

Tyler Dotson
PLUS
Tyler Dotson
Courses Plus Student 1,740 Points
Posted by Tyler Dotson
Tyler Dotson
Courses Plus Student 1,740 Points

I am just lost.

This concept is just really confusing me.

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

}

init?(dict: [String : String]) {
    return nil
}
brandenyang
brandenyang
4,998 Points

I think if you add this it should work. Also put the initializer inside the struct.

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"]
}

3 Answers

Jeff McDivitt
Jeff McDivitt
23,970 Points
Jeff McDivitt
Jeff McDivitt
23,970 Points 
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"]
    }

}
brandenyang
brandenyang
4,998 Points

Did that work for you?

Jeff McDivitt
Jeff McDivitt
23,970 Points
Jeff McDivitt
Jeff McDivitt
23,970 Points

Yeah does it not for you?

brandenyang
brandenyang
4,998 Points
brandenyang
brandenyang
4,998 Points

Oh, sorry I was just making sure Tyler Dotson got it.