How to sort array based on key?

Question

I have an array which has two types of objects: Awarded and non-awarded. I simply want to sort my array so that awarded objects are placed first, and the rest are placed afterwards.

Here is the code that defines the key "awarded":

if let awarded = achievements[indexPath.row].userRelation["awarded"] as? String where awarded != "<null>" { }

Within those brackets I'd like to use my unwrapped value "awarded" to sort through the achievements and add those to the beginning, and the rest at the end.

How would I go about doing that?

What exactly is an achievement here? Is it an object, which contains a userRelation dictionary <String, String>? Kind of a strange entity model :/ — alexburtnik
– alexburtnik, Commented Oct 20, 2016 at 20:49
yeah it contains a bunch of properties, one of which is userRelation which has the "awarded" key — Faisal Syed
– Faisal Syed, Commented Oct 20, 2016 at 20:50
var descriptor = NSSortDescriptor(key: "awarded", ascending: false) var stories = (achievements as NSArray).sortedArray(usingDescriptors: [descriptor]) — Himanshu Moradiya
– Himanshu Moradiya, Commented Oct 21, 2016 at 5:40

alexburtnik · Accepted Answer · 2016-10-20 21:09:46Z

2

You should experiment with sort function, it is very useful.

let sortedAchievements = achievements.sorted{ $0.userRelation["awarded"] < $1.userRelation["awarded"] }

To sort in place use this:

achievements.sort{ $0.userRelation["awarded"] < $1.userRelation["awarded"] }

I would recommend to refactor your model. It's better to use objects or structs instead of dictionaries. Also awarded should be a Bool property, not a String, right?

edited Oct 20, 2016 at 21:09

answered Oct 20, 2016 at 20:58

alexburtnik

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