Sorting of Multidimensional Associative Array by Value (SWIFT)

Question

How could I sort the following associative array:

[
  ["name": "Zone A", "type": "1"], 
  ["name": "Zone B", "type": "2"], 
  ["name": "Zone C", "type": "1"],
  ["name": "Zone D", "type": "3"], 
  ["name": "Zone E", "type": "2"], 
  ["name": "Zone F", "type": "3"],
  ["name": "Zone G", "type": "1"], 
  ["name": "Zone H", "type": "2"]
]

to result in the following - sorted by TYPE:

[
  ["name": "Zone A", "type": "1"], 
  ["name": "Zone C", "type": "1"],
  ["name": "Zone G", "type": "1"], 
  ["name": "Zone B", "type": "2"], 
  ["name": "Zone E", "type": "2"], 
  ["name": "Zone H", "type": "2"]
  ["name": "Zone D", "type": "3"],       
  ["name": "Zone F", "type": "3"],
]

Thanks in advance!

You don't sort an associative array. It makes no sense. You copy elements to a regular array and sort it. — n. m. could be an AI
– n. m. could be an AI, Commented Nov 19, 2018 at 6:28
You should have that array as an array of a struct with name and type instead of a dictionary. — Rakesha Shastri
– Rakesha Shastri, Commented Nov 19, 2018 at 6:32

shawn · Accepted Answer · 2018-11-19 06:32:34Z

2

Use sort

var a = [
  ["name": "Zone A", "type": "1"], 
  ["name": "Zone B", "type": "2"], 
  ["name": "Zone C", "type": "1"],
  ["name": "Zone D", "type": "3"], 
  ["name": "Zone E", "type": "2"], 
  ["name": "Zone F", "type": "3"],
  ["name": "Zone G", "type": "1"], 
  ["name": "Zone H", "type": "2"]
]

a.sort { (v1, v2) -> Bool in
    return v1["type"]! < v2["type"]!
}

//or:
//a.sort { $0["type"]! < $1["type"]! }

print("\(a)")

See also: Swift how to sort array of custom objects by property value

And sort & sorted: https://developer.apple.com/documentation/swift/array/2296801-sort

sort: Sorts the collection in place.
sorted: Returns the elements of the sequence, sorted.

edited Nov 19, 2018 at 6:32

answered Nov 19, 2018 at 6:27

shawn

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2 Comments

iSofia Over a year ago

Thank you. That's brilliant, shawn. I should elaborate, for clarity, that the structure in the OP is actually an array, and not a dictionary (mis-tagged). Accordingly, this sort solution works perfectly. Always foggy about these terminologies.

shawn Over a year ago

PHP uses the concept Associative Array more and Swift uses the concept Dictionary more, they are the same. See here: iosdose.com/wp/2017/08/22/swift-dictionary . And about sort and sorted: the sort does sort on the original array and changes it. sorted doesn't change the original array and return a newly created sorted array.

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