Xcode functions, Parameters, Tuples and Dictionaries. Please help.

Question

I am trying to complete one of the extra credit tasks: "Write a function that accepts a Dictionary as parameter and returns a named tuple. The Dictionary should contain the following keys: title, artist, album." Here is what I have come up with so far.

func searchMusic (#musicInfo: Dictionary) -> (found: Bool,description: String) {

    let music = [

        [ "Title": "96 Quite Bitter Beings", "Artist": "CKY", "Album": "Camp Kill Yourself, Vol.1"],


        [ "Title": "Psychosocial", "Artist": "Slipknot", "Album": "All Hope Is Gone"],

        [ "Title": "Gasolina", "Artist": "Daddy Yankee", "Album": "Barrio Fino"],

        [ "Title": "Where Them Girls At", "Artist": "David Guetta", "Album": "Where Them Girls At"],

        [ "Title": "Who's That Chick", "Artist": "David Guetta", "Album": "Where Them Girls At"],
    ]

    var found = (false, "This music is not found")

    for m in music {
        if m == musicInfo {
            found = (true,"This music is found)")
        }
    }

    return (title,artist,album)

}

It took me ages to make this code without it having any errors. Now I cant find a way to enter the input to get the return that I want. I tried the blow but this did not work:

let (found,description) = searchMusic (["Title": "96 Quite Bitter Beings", "Artist": "CKY", "Album": "Camp Kill Yourself, Vol.1"])

let result = searchMusic(["Title": "96 Quite Bitter Beings", "Artist": "CKY", "Album": "Camp Kill Yourself, Vol.1"])

ideally i would like a way to enter part of a dictionary and get the full desired result. I am now lost. If any body can give me some help I would really appreciate it!

Answer 1 · 2015-01-12T03:31:58Z

January 12, 2015 3:31am

I took a look at your function quite closely and found a few issues. First I'd like to point out that a parameter needs a specific type, you did specify the type by putting "Dictionary", but it needs more details. I noticed your Dictionary requires a set of strings so to specify that the parameter needs a dictionary that has strings in it you must do this:

func searchMusic (#musicInfo: Dictionary<String,String>)

Here I am specifying that I want a dictionary with a key that is a string and a value that is a string. You may change this as you wish.

Second, though I haven't looked closely at this extra credit myself, but your function is suppose to return a boolean and a string, a count of two return items, but instead your function currently returns 3 items.

// What your function needs to return 
 -> (found: Bool,description: String) {

// What you are actually trying to return
return (title,artist,album)

So what you need to do is specify that your function will return 3 items instead of 2 like so:

 -> (Title: String , Artist: String, Album:String)

This should help you towards going in the right direction to complete the extra credit. If you need any further help just let me know.

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Eliot Murton

Eliot Murton

Xcode functions, Parameters, Tuples and Dictionaries. Please help.

1 Answer

Guled Ahmed

Guled Ahmed