Array of object have further inner array of object

Question

My class

class ScoreModel {
    var playerId: Int?
    var holeScores: [HoleScore]?
}

Other Class

class HoleScore {
    var holeScore: Int?
}

I have these classes one is ScoreModel class which can have Array of objects of HoleScore

let scoreList = [ScoreModel]()
scoreList[0].holeScores![0].holeScore = 3

When i update or change holeScore for scoreList[0].holeScores[0] it changes it for all the scoreList[forAllIndexes].holeScores[0]. I just want to change the inner array prams for given index of outer array but it changes all the holeScore values when ever update.

Remember that class has reference semantics, how scoreList filled? — Ahmad F
– Ahmad F, Commented Apr 24, 2018 at 8:19
It looks like you appended always the same HoleScore instance to holeScores — vadian
– vadian, Commented Apr 24, 2018 at 8:20
Better change to struct if you are not familiar on dealing with reference type — Tj3n
– Tj3n, Commented Apr 24, 2018 at 8:22

Shehata Gamal · Accepted Answer · 2018-04-24 08:39:29Z

2

This appends the same object , so change in one reflects to others

var item = HoleScore()

for i in 0...5
{
    item. holeScore = i

    scoreList[0].holeScores.append(item)
}

//

This appends different objects , so change in one doesn't reflects to others

for i in 0...5
{
    var item = HoleScore()

    item. holeScore = i

    scoreList[0].holeScores.append(item)
}

answered Apr 24, 2018 at 8:39

Shehata Gamal

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Comments

Mujahid Latif · Accepted Answer · 2018-04-25 05:46:44Z

1

Just solved my problem converting my classes to struct .I just did not know how to deal with this reference types in a nested sub arrays .So I used struct

   struct ScoreModel {
        var playerId: Int?
        var holeScores: [HoleScore]?
    }

   struct HoleScore {
    var holeScore: Int?
   }

Now setting value for a specific inner index will not effect others

let scoreList = [ScoreModel]()
scoreList[0].holeScores![0].holeScore = 3

answered Apr 25, 2018 at 5:46

Mujahid Latif

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