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iOS Swift 2.0 Enumerations and Optionals Introduction to Optionals Initializing Optional Values

shane reichefeld
PLUS
shane reichefeld
Courses Plus Student 2,232 Points

Help i cant solve problem

help

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

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

 }

1 Answer

Hey,

Start with creating the failable init() function with a dictionary as the parameter type. Check the title and author have values. Lastly, init all the stored properties.

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

        // Init the vales
        self.title = title
        self.author = author
        price = dict["price"] // Optional (can be nil)
        pubDate = dict["pubDate"] // Optional (can be nil)

    }