Extract Last Word in String with Swift

Question

What is the way of extracting last word in a String in Swift? So if I have \"Lorem ipsum dolor sit amet\", return \"amet\". What is the most efficient way of doing this?

Answer 1

Swift 5

extension String {

    func trim(_ emptyToNil: Bool = true)->String? {
        let text = self.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
        return emptyToNil && text.isEmpty ? nil : text
    }

    var lastWord: String? {
        if let size = self.lastIndex(of: " "), size >= self.startIndex {
            return String(self[size...]).trim()
        }
        return nil
    }

}

Usage

print("Out of this world!!!".lastWord ?? "") // world!!!