Swift how to sort array dictionary by key values

Question

I have a list of URL and its respective favourite counts obtained from firebase database appended into an array of dictionaries as such:

dictionaryArray = [[1: URL1], [2: URL2], [1: URL3]]

I understand that we can sort the array of dictionaries by using .sort but that removes dictionaries with similar keys like in this case.

how do I sort it such that I get an array of the url ordered by their keys to this:

urlArray = [URL2, URL1, URL3]

since URL2 has the higher key whereas URL1 and URL3 have similar keys

No no that doesn't explain what happens when there are duplicate keys. Ive tried that solution but it basically just removed the duplicates — lws803
– lws803, Commented Nov 22, 2016 at 9:31
Sorting a collection will never remove entries. Can you show what you exactly tried? — Martin R
– Martin R, Commented Nov 22, 2016 at 9:56

Thomas G. · Accepted Answer · 2016-11-22 10:19:21Z

2

You could use higher-order functions sorted and flatMap nested together like so:

let sortedURLs = dictionaryArray
                    .sorted(by: { $0.keys.first! > $1.keys.first! })
                    .flatMap({ $0.values.first! })

Note: watch out of forced unwrapped optionals it is working here but could lead to an exception

answered Nov 22, 2016 at 10:19

Thomas G.

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Parth Adroja · Accepted Answer · 2016-11-22 10:22:24Z

-1

You can sort by using sort descriptors available like below.

var descriptor: NSSortDescriptor = NSSortDescriptor(key: "name", ascending: true)
var sortedResults: NSArray = results.sortedArrayUsingDescriptors([descriptor])

answered Nov 22, 2016 at 10:22

Parth Adroja

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