Swift sort an Array

Question

I want to sort an array

like this:

let elements = ["S","A","C","C","T","E","E","E","F","S","S","A","A","C"]

I tried do this

var currentElement = ""
var newElements:[String] = []
for element in elements {
    if currentElement != element{
        currentElement = element
        newElements.append(element)
    }
}

but print["S", "A", "C", "T", "E", "F", "S", "A", "C"]

How to sort this to ["A","C","E","F","S","T"]

Wtf, you are not even sorting anything in your if condition, it's not even AN ATTEMPT to sort anything, you are just suppressing the duplicates ! Looks to me a lot like some kind of homework you don't want to do, get back to work and search on google. — N.K, Jun 06 '18 at 08:21
First: Unique values: https://stackoverflow.com/questions/27624331/unique-values-of-array-in-swift Then sort: https://stackoverflow.com/questions/26719744/swift-sort-array-of-objects-alphabetically — Larme, Jun 06 '18 at 08:22

score 5 · Answer 1 · answered Jun 06 '18 at 08:20

5

let elements = ["S","A","C","C","T","E","E","E","F","S","S","A","A","C"]

let sortedElements = elements.sorted(by: {$0 < $1})

print(sortedElements)

prints:

["A", "A", "A", "C", "C", "C", "E", "E", "E", "F", "S", "S", "S", "T"]

answered Jun 06 '18 at 08:20

Teetz

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score 3 · Accepted Answer · answered Jun 06 '18 at 08:22

What you want to do is to remove the duplicates and then sort it, right?

You can convert it to a Set, and then call sorted():

let elements = ["S","A","C","C","T","E","E","E","F","S","S","A","A","C"]
let newElements = Set(elements).sorted() // ["A", "C", "E", "F", "S", "T"]

score 0 · Answer 3 · answered Jun 06 '18 at 08:48

You should use ComparisonResult to sort your array alphabetical, because Set(elements).sorted() and you have lowercase characters, the result of sort will be wrong.

var elements = ["S","A","C","C","T","E","E","E","F","S","S","A","A","C"]

elements = elements.sorted { $0.localizedCaseInsensitiveCompare($1) == ComparisonResult.orderedAscending }

//the output["A", "A", "A", "C", "C", "C", "E", "E", "E", "F", "S", "S", "S", "T"]

Swift sort an Array

3 Answers3