How to sort an array in Swift

Question

I want the Swift version of this code:

NSArray *sortedNames = [names sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];

Answer 1

Most efficient way of sorting in SWIFT

The use of Operator Overloading is the most efficient way to sort Strings in Swift language.

// OPERATOR OVERLOADING
let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]
var sortedNames = sorted(names, <)
var reverseOrder = sorted(names, >)

In above code > and < operators are overloaded in Swift to sort Strings.

I have test the code in Playground and conclude that when we use operator overloading it is best for sorting Strings.

Copy below to Playground.

let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]

var reversed = sorted (names,
    // This is a closure
    { (s1 : String, s2 : String) -> Bool in
        return s1 > s2
    }
)
println(reversed)

var reverseOrder = sorted(names, {s1, s2 in s1 > s2})

var reverseOrder2 = sorted(names, { $0 > $1} )

// OPERATOR OVERLOADING
var reverseOrder3 = sorted(names, >)

The conclusion from Playground:

From above image you can see that all other ways needs to enumerate loops for sorting 5 strings. Where as when we use Operator overloading it does not required to enumerate loop to sort strings.

Referenced from Swift documentation