Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

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

Posted by Ahmed Elkasrawi
Ahmed Elkasrawi
2,756 Points

I've ran this code on Playgrounds and I'm confident it works; however I keep getting an error message

The error says that I'm not structuring the description correctly and that I'm not using string interpolation. Only this exercise is preventing me from marking the whole course as completed. Appreciate the help.

structs.swift 
struct Tag {
  let name: String
}

struct Post {
    let title : String
    let author : String
    let tag : Tag
    init(title : String, author : String, tag : Tag) {
        self.title = title
        self.author = author
        self.tag = tag
    }

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

let firstPost = Post(title: "iOS Development", author: "Apple", tag: Tag(name: "swift"))

let postDescription = firstPost.description()

1 Answer

tromben98
tromben98
13,273 Points
tromben98
tromben98
13,273 Points

Hi you put a parenthesis on the last line which caused the error. 

struct Tag {
  let name: String
}

struct Post {
    let title : String
    let author : String
    let tag : Tag
    init(title : String, author : String, tag : Tag) {
        self.title = title
        self.author = author
        self.tag = tag
    }

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

let firstPost = Post(title: "iOS Development", author: "Apple", tag: Tag(name: "swift"))

let postDescription = firstPost.description
// look on the line above

Best regards Jonas

Ahmed Elkasrawi
Ahmed Elkasrawi
2,756 Points

Thanks for the response Jonas; but that's not the reason. "description" is a method and you have to add the parenthesis to call it (as far as i know). removing them causes an error and the code is not compiled.

As i mentioned; this worked fine in Playgrounds. Only on the website quiz it wouldn't work. It should be this line below since in the compiler here it doesn't look like it's understood correctly.

return("(title) by (author). Filled under (tag.name)")