Swift 3: Sort Ordered List of Objects by Property

Question

In Swift 3 I define my array as:

var filteredObjects = [Int: CustomObject]()

then I populate array with data:

filteredObjects[filteredObjects.count] = CustomObject

Now I want to sort array by (1) property "title" of CustomObject which is a String and (2) a float property "distance" of CustomObject.

When I try:

filteredObjects.sort({ $0.distance < $1.distance })

it produces error Value of tuple type (key:Int, value:CustomObject) has no member distance

I suspect I cannot use sort method like this but I cannot find the solution.

Your array is actually a dictionary. A dictionary is unordered by definition. — vadian
– vadian, Commented Oct 30, 2017 at 5:26
Check this : stackoverflow.com/questions/35431754/… . if it helps in your scenario. — Amit
– Amit, Commented Oct 30, 2017 at 5:36
let sortedTuples = filteredObjects.sorted{ $0.value.distance < $1.value.distance } — Leo Dabus
– Leo Dabus, Commented Oct 30, 2017 at 5:37

Community · Accepted Answer · 2017-10-31 09:26:56Z

1

In swift 3: While using sort in filteredObjects i.e dictionary $0 will give you a single object from filteredObjects which will be of tuple type "((key: Int, value: CustomObject), (key: Int, value: CustomObject))". $0.distance will actually try to find distance property in the tuple which isn't available in the result tuple, so you are getting error Value of tuple type (key:Int, value:CustomObject) has no member distance

What you can do is

let resultDictionary = filteredObjects.sorted() { 
  $0.0.value.distance < $0.1.value.distance 
}

$0.0.value is of type CustomObject which have property distance according to which you want to sort the result.

Special thanks to @Leo Dabus.

edited Oct 31, 2017 at 9:26

CommunityBot

11 silver badge

answered Oct 30, 2017 at 5:45

laxman khanal

9981 gold badge9 silver badges19 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Leo Dabus Over a year ago

Btw by using the parentheses you need to add the by: keyword

Leo Dabus Over a year ago

And you can’t use sort. Dictionary is an unordered collection

laxman khanal Over a year ago

I have already up voted your comment. I tried to explain why @Vad is getting that error.

Leo Dabus Over a year ago

again by using the parentheses you need to add the by: keyword .sorted(by: { ... }) or remove the parentheses .sorted { ... }

Collectives™ on Stack Overflow

Swift 3: Sort Ordered List of Objects by Property

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related