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iOS

Posted by Nasrullah Thajudeen
Nasrullah Thajudeen
890 Points

tuple & dictioneries

... whats wrong with the below code [ i just wanted to give the song number and then be able to get the song details [ album,artist, title]

let song1 = ["Title": "Afraid","Artist": "Eminem", "Album": "Mockingbird"] let song2 = ["Title": "Move Ur Self","Artist": "Eminem", "Album": "Mockingbird"] let song3 = ["Title": "One love","Artist": "Eminem", "Album": "Mockingbird"] func trackDetail (#trackNumber: Dictionary <String,String>)->(Title:String,Artist: String,Album: String){

if trackNumber == song1 {
    var musciAlbum = song1["Album"]
    var musicTitle = song1["Title"]
    var musicArtist = song1["Artist"]

    if trackNumber == song2 {
        var musciAlbum = song2["Album"]
        var musicTitle = song2["Title"]
        var musicArtist = song2["Artist"]
    }
    if trackNumber == song3 {
        var musciAlbum = song3["Album"]
        var musicTitle = song3["Title"]
        var musicArtist = song3["Artist"]
    }

}

let music =  (musicAlbum,musicArtist,musicTitle)

return music

}

trackDetail(trackNumber:"song1")

2 Answers

Maximiliane Quel
Maximiliane Quel
Courses Plus Student 55,489 Points

Hi,

I am not sure this is the most elegant version but you could do this:

  1. first you need to add a type for the key and value when you declare the dictionary as the type of the argument
  2. the return you want is of type string
  3. then you want to create variables that access the individual elements of your dictionary and store them so you can use them when you construct the string that you want to return. you can either concatenate or use string interpolation. you need to unwrap the variables. you do not need a conditional statement because you are sending in the respective song as a parameter
  4. when you call the function you should not put “song1” into quotes since it is a constant not a String

the code would look like this:

let song1 = ["Title": "Afraid","Artist": "Eminem", "Album": "Mockingbird"]
let song2 = ["Title": "Move Ur Self","Artist": "Eminem", "Album": "Mockingbird"]
let song3 = ["Title": "One love","Artist": "Eminem", "Album": "Mockingbird"]

func trackDetail (#trackNumber: Dictionary<String, String> )-> String {

    var album = trackNumber["Album"]!
    var artist = trackNumber["Artist"]!
    var title = trackNumber["Title"]!

    return "Album: \(album) , Artist: \(artist), Title: \(title))"
}

trackDetail(trackNumber: song1)

Does that help?

Nasrullah Thajudeen
Nasrullah Thajudeen
890 Points

this is what i am looking for , thanks a lot for your time, much appreciated

Maximiliane Quel
PLUS
Maximiliane Quel
Courses Plus Student 55,489 Points
Maximiliane Quel
Maximiliane Quel
Courses Plus Student 55,489 Points

You are welcome :0)