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1,762 PointsI couldn't understand what this question asked me. Can someone give me a clue or an answer. The code I wrote is below
In the editor, you have a struct named Book which has few stored properties, two of which are optional.
Your task is to create a failable initializer that accepts a dictionary of type [String : String] as input and initializes all the stored properties. (Hint: A failable init method is one that can return nil and is written as init?).
Use the following keys to retrieve values from the dictionary: "title", "author", "price", "pubDate"
Note: Give your initializer argument the name dict
struct Book {
let title: String
let author: String
let price: String?
let pubDate: String?
init?(dict: [String: String], title: String, author: String, price: String, pubDate: String) {
self.title = title
self.author = author
self.price = price
self.pubDate = pubDate
if let title = dict["title"], let author = dict["author"]{
let price = dict["price"]
let pubDate = dict["pubDate"]
Book(dict: ["My": "Books"], title: title, author: author, price: price!, pubDate: pubDate!)
}
return nil
}
}
1 Answer
Amazon Web
iOS Development Techdegree Student 4,092 PointsAlright! You don't need to add all the properties in the argument of init method, you only need the dictionary.
init? (dict: [String: String] {
//The code below belongs here
}
Next you need to get the value of title and author from the dictionary. If these values are nil you need to return nil (because these properties are non optional)
if let title = dict["title"], let author = dict["author"] {
self.title = title
self.author = author
}else {
return nil
}
Finally, you need to get the value of price and pubdate from the dictionary. If these values are nil, no problem! Because these are optionals (so they can have nil values),
self.price = dict["price"]
self.pubDate = dict["pubDate"]
Endi Hıdır
1,762 PointsEndi Hıdır
1,762 PointsThank you so much Amazon Web