WordsInString.swift

//https://medium.com/@sorenlind/three-ways-to-enumerate-the-words-in-a-string-using-swift-7da5504f0062
extension String {
    func words() -> [String] {
        let range = self.startIndex..<self.endIndex
        var words = [String]()
        
        self.enumerateSubstrings(in: range, options: NSString.EnumerationOptions.byWords) { (substring, _, _, _) -> () in
            words.append(substring ?? "")
        }
        return words
    }
}

var st =  "ajdlkkl . d,"
print(st.words())