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"]
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"]
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"]
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"]
