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iOS Swift Functions and Optionals Parameters and Tuples Tuples

Posted by D'Andre Ealy
D'Andre Ealy
746 Points

I am trying to do this extra credit question, could someone lead me in the right direction.

Write a function that accepts a Dictionary as parameter and returns a named tuple. The dictionary should contain the following keys: title, artist and album.

func music (info:String) ->  track: String {

    var music = ["title":"Bad Girl", "artist":"usher", "album":"part2"]

    return music

}

music(info: "Bad Girl")

2 Answers

Sean Lee
Sean Lee
5,196 Points
Sean Lee
Sean Lee
5,196 Points

You're trying to pass a String when you need to pass a Dictionary that contains the title, artist, album.

I've come up with the following:

let musicDictionary = 
   [
        "title":"Blank Space",
        "artist":"Taylor Swift",
        "album":"1984"
    ]

func musicTuple (#info: Dictionary <String, String>) -> (title: String, artist: String, album: String) 
{

    return (title:info["title"]!, artist:info["artist"]!, album:info["album"]!)
}

musicTuple(info: musicDictionary).title
musicTuple(info: musicDictionary).artist
musicTuple(info: musicDictionary).album
Cory Braun
Cory Braun
1,204 Points
Cory Braun
Cory Braun
1,204 Points

Thanks for posting your answer Sean. I'm still a little confused about a few things.

How come the Dictionary is declared first, and not declared inside the curly braces (as Amit does with the Array in the Tuple video)?

Also, in the return, why do we use exclamation points after "title"], "artist"] and "album"]?