Sorting a custom array based on String Array

Question

I have to sort an array of Custom class 'SongItem' based on another array which is my String array with multiple types (have to apply OR validation).

Suppose my Custom array is :

class SongItem: NSObject {

    var songId: String?
    var title: String?
    var artistName: String?
    var isrc: String?

    var genreArray = [String]()
}

<SongItem: 0x1c03097e0>
<SongItem: 0x1c03097e0>
<SongItem: 0x1c03097e0>
<SongItem: 0x1c03097e0>
<SongItem: 0x1c03097e0>
<SongItem: 0x1c03097e0>

I have another String array that has three values:

genreStringArray = ["Music","Alternative","Blues"]

Now I have to filter my Custom array based on another String array.

Here is my code:

for i in 0..<genreStringArray.count {

     let genre  = genreStringArray[i]
     self.customArray = self.customArray.filter({ $0.genreArray.contains(genre) })
}

As I am using for loop here so filtering is working fine in AND manner, but I have to filter this with OR manner. I mean this should be like :

self.datasource = self.datasource.filter { $0.genreArray.contains(genre1) || $0.genreArray.contains(genre2) || $0.genreArray.contains(genre3)}

Please anyone suggest me.

It is not clear what you are asking here, what is genre1, genre2 and genre3? maybe you should add some sample data (the print of th Custom array is not helpful) and expected output — Joakim Danielson
– Joakim Danielson, Commented Apr 8, 2019 at 10:36
I have given example with genre1, genre2 and genre3 as different types of genreStringArray. — user2786
– user2786, Commented Apr 8, 2019 at 10:37
That makes no sense. Is genreArray the same as genreStringArray? And is datasource the same as custom array? — Joakim Danielson
– Joakim Danielson, Commented Apr 8, 2019 at 10:39
Currently what happening if there are two item in my custom array, then after applying filter I am getting empty custom array. — user2786
– user2786, Commented Apr 8, 2019 at 10:40

Rakesha Shastri · Accepted Answer · 2019-04-08 10:49:00Z

2

This should do.

customArray.filter({ !Set($0.genreArray).intersection(Set(genreStringArray)).isEmpty })

No need for an extra for loop. Just check if the genreStringArray and the genreArray of your object have common elements. If it does, then it is filtered in.

Tip: You should probably use better naming for your variables so that it is less confusing and simple. Something like this maybe?

class Song {
    var id: String?
    var title: String?
    var artist: String?
    var isrc: String? // I don't know what this is!

    var genres = [String]()
}

edited Apr 8, 2019 at 10:49

answered Apr 8, 2019 at 10:41

Rakesha Shastri

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3 Comments

user2786 Over a year ago

Thank you @Rakesha for your response. Can you pls check my updated question, genreArray is one of my property of my entity class.

Rakesha Shastri Over a year ago

@user2786 yes i am aware of that.

user2786 Over a year ago

Thank you so much @Rakesha, this works.. isrc is basically ISRC Id used in Apple Music/iTunes.

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