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Start your free trialJulien Schmitt
2,334 PointsExtract value in a struct?
Hi all,
Little obstacle I'm facing here.
The constant postDescription returns "iOSDevelopment by Apple. Filed under Tag(name: "swift")".
How can I get it to return "iOSDevelopment by Apple. Filed under swift" ?
Thanks,
Julien
struct Post {
let title: String
let author: String
let 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()
4 Answers
jcorum
71,830 PointsJulien, in the description method you need to give it a Tag object's name, not a Tag object:
struct Post {
let title: String
let author: String
let tag: Tag
func description() -> String {
return "\(title) by \(author). Filed under \(tag.name)"
}
}
let firstPost = Post(title: "iOSDevelopment", author: "Apple", tag: Tag(name: "swift"))
let postDescription = firstPost.description()
Julien Schmitt
2,334 PointsHi jcorum,
Thanks for the help, it did work.
However could you explain me why we have to specify the .name ? If we refer to the tag structure that contains only one stored property that is name, why do we have to specify it?
Thanks in advance,
Julien
jcorum
71,830 PointsJulien, good question. tag is a Tag object, just like title is a String object. tag.name is a String. The default initializer expects String, String, Tag, but the function needs a String, i.e., tag.name
P.S., you could do this instead:
let tag = Tag(name: "swift")
let firstPost = Post(title: "iOS Development", author: "Apple", tag: tag)
Here you create the tag object first, and then pass it in as the 3rd parameter.
Julien Schmitt
2,334 PointsThanks for your explanation !