None of these lines work, don't know if there's something wrong with the site..

Question

Challenge Task 2 of 2

We learned about instance methods before. For this task, add an instance method to Post.

Name the method description. It takes no parameters and returns a string that describes the post instance. For example given a title: "iOS Development", author: "Apple", and a tag named "swift", the description would read as follows"

"iOSDevelopment by Apple. Filed under swift"

Once you have an instance method, call it on the firstPost instance and assign the result to a constant named postDescription

structs.swift

struct Tag {
    let name: String
}

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

    func description() -> String {

        return "\(title) by \(author). Filed under \(tag)"
    }
}

let firstPost = Post(title: "iOSDevelopment", author: "Apple", tag: Tag(name: "Swift"))

let postDescription = firstPost.description()

// let firstPost = Post(title: "iOSDevelopment", author: "Apple", tag: Tag(name: "swift")).description()

// let postDescription = firstPost

Answer 1 · 2016-02-12T04:24:42Z

February 12, 2016 4:24am

Ok I see why The compiler refuses your code. It seems like you are encountering a problem in the second task of the challenge. First of all, you made a mistake in the writing of the method description. I f you try to run the same code in Playground you will figure out what you've done wrong. Your description method is:

          <p>func description() -> String {

        return "\(title) by \(author). Filed under \(tag)"
    }</p>
          ```
But it should be this:

```html
          <p>func description() -> String {

        return "\(title) by \(author). Filed under \(tag.name)"
    }</p>
          ```
You have just forgotten to access the **name** property out of the **tag** parameter. It looks like you were trying to return a struct as a String. Notice that **tag** is not equal to **tag.name**. **tag** is of type **Tag** and is a struct while **tag.name** is a String. 

this is how it should look :


```html
          <p>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: "iOS Development", author: "Apple", tag: Tag(name: "swift"))

let postDescription = firstPost.description()
</p>
          ```
Hope that's gonna be helpful.

Answer 2 · 2016-02-12T09:09:44Z

February 12, 2016 9:09am

I remember getting tripped up on this. Remember the var: tag isn't a string like author and title, its an instance of the Tag struct. you need to call tag.name to get the string, calling just tag doesn't return a string.

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William Hartvedt Skogstad

William Hartvedt Skogstad

None of these lines work, don't know if there's something wrong with the site..

William Hartvedt Skogstad

William Hartvedt Skogstad

2 Answers

Frezy Mboumba

Frezy Mboumba

William Hartvedt Skogstad

William Hartvedt Skogstad

Reed Carson

Reed Carson