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iOS Build a Simple iPhone App with Swift 2.0 Getting Started with iOS Development Swift Recap Part 1

Posted by Unsubscribed User
Unsubscribed User
2,263 Points

Problem with struct

In the Swift Recap code challenge, part 1, this code was accepted as a correct answer:

// Code Challenge Part 1

struct Tag {
   let name: String
}

struct Post {
    let title: String
    let author: String
    let tag = Tag(name: "Swift")

    init(title: String, author: String)   {
        self.title = title
        self.author = author
    }   
}

let firstPost = Post(title: "Hello World", author: "Brian Cassidy")

Yet in part 2 of the challenge, this failed even though it compiled in the Xcode playground that I tried first:

// Code Challenge Part 2

struct Tag {
   let name: String
}
struct Post {
    let title: String
    let author: String
    let tag = Tag(name: "Swift")

    init(title: String, author: String)   {
        self.title = title
        self.author = author
    }

    func description() -> String {
        return "\(title) by \(author). Filed under \(tag)"
    }

}
let firstPost = Post(title: "Hello World", author: "Brian Cassidy")
let postDescription = firstPost.description()

I had trouble passing a String in as an init parameter for firstPost, so I simply set the stored property in the body of the struct, and it worked fine. When I set postDescription = firstPost.description(), the output appears as:

"Hello World by Brian Cassidy. Filed under Tag(name: "Swift")"

Obviously, that's not correct either.

I can't seem to figure it out with Apple's Swift 2.2 documentation.

Any tips on what I'm doing wrong? Thanks in advance...

structs.swift 
struct Tag {
    let name: String
}
struct Post {
    let title: String
    let author: String
    let tag = Tag(name: "Swift")

    init(title: String, author: String)   {
        self.title = title
        self.author = author
    }

    func description() -> String {
        return "\(title) by \(author). Filed under \(tag)"
    }

}

let firstPost = Post(title: "Hello World", author: "Brian Cassidy")
let postDescription = firstPost.description()
Unsubscribed User
Unsubscribed User
2,263 Points

I made it a bit farther, but the code challenge is still failing even the my Xcode playground executes and produces the desired results. I had forgotten to access the name property of tag using dot notation (duh):

struct Post {
    let title: String
    let author: String
    let tag = Tag(name: "Swift")

    init(title: String, author: String)   {
        self.title = title
        self.author = author
    }

    func description() -> String {
        return "\(title) by \(author). Filed under \(tag.name)"
    }
}

let firstPost = Post(title: "Hello World", author: "Brian Cassidy")
let postDescription = firstPost.description()

I'm still confused about why the second part of code challenge is failing though.

1 Answer

Reed Carson
Reed Carson
8,306 Points
Reed Carson
Reed Carson
8,306 Points

Well even though that code passed the first part of the challenge for whatever reason, its not quite what its looking for. First, youve hard coded the tag, and created an initializer which is cool but not asked for by the challenge. Neither is it necessary because structs have their own free memberwise initializers if no custom init method is written, which does exactly what the one you wrote does.

struct Tag {
    let name: String
}

struct Post {
    var title: String
    var author: String
    var tag: Tag

    func description() -> String {
    return ("\(title) by \(author). Filed under \(tag.name)")

    }

}


let firstPost = Post(title: "Reed", author: "yaaaayy", tag: Tag(name: "name"))

let postDescription = firstPost.description()

It shouldnt have let your code pass at first when it was going to reject it later.

Unsubscribed User
Unsubscribed User
2,263 Points

Thanks, Reed. I didn't initially add an init() method to Post, knowing that structs have member wise initializers, but I was having trouble passing a string for "tag" in the firstPost instantiation. I hadn't thought of instantiating the string for "tag" right in the parameters for the firstPost instantiation. I appreciate the feedback.