Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Intermediate Swift 2 Extensions and Protocols Protocol Conformance Through Extensions

Sheng Wei
Sheng Wei
4,382 Points

[Help!] How to write conformance protocol through extensions?

Task: Extend User to conform to PrettyPrintable by adding a computed property that returns a formatted description of a User instance. The specifics of the formatted description don't matter

(Also, the engine for this challenge doesn't seem to accept any of my inputs. The moderators might want to check this out!)

protocols.swift
protocol PrettyPrintable {
    var prettyDescription: String { get }
}

struct User {
    let name: String
    let ID: Int
}

// Enter your code below

extension User: PrettyPrintable {
       var user: String {
           return "User is Great!"
       }
}

1 Answer

Wei, here's a version that works, to help you get going:

extension User: PrettyPrintable {
    var prettyDescription: String {
        return "UserName: \(name), UserID: \(ID)"
    }
}

let u1 = User(name: "Sheng Wei", ID: 14)
u1.prettyDescription  //displays "UserName: Sheng Wei, UserID: 14"

You need a computed property named prettyDescription that returns a String, as yours does. But then you need to return a String that formats the name in the way requested.