Composed character count

gistfile1.txt

extension String {
    var composedCount : Int {
        var count = 0
        enumerateSubstringsInRange(startIndex..<endIndex, options: .ByComposedCharacterSequences) {_ in count++}
        return count
    }
}

Swift 3 version:

extension String {
    var composedCount : Int {
        var count = 0
        enumerateSubstrings(in: startIndex..<endIndex, options: .byComposedCharacterSequences) {_ in count += 1}
        return count
    }
}