Length of String as extension of String

Question

I know that there will be lots of pointers to duplicates but this worked before I updated to xcode 6.3 and now it has a problem with it.

The script:

exte         


        

Answer 1

var str = "Hello, playground"

extension String {
    func removeCharsFromEnd(n:Int) -> String {
        return substringWithRange(Range(start: startIndex, end: advance(startIndex, count(self) < n ? 0 : count(self)-n )))
    }
}

"Hello, playground".removeCharsFromEnd(3)  // "Hello, playgro"
"                                                                    

                                                        
            

Answer 2

count is the name of your extension method parameter and hides the Swift library function count(). You can rename the parameter or call

var stringLength = Swift.count(getSelf.utf16)

explicitly.

But note that counting the number of UTF-16 code units is wrong here, it should be

var stringLength = Swift.count(getSelf)

to count the number of characters in the string, because that is what advance() also counts. You can verify that easily with

let foo = "