String, substring, Range, NSRange in Swift 4

Question

I am using the following code to get a String substring from an NSRange:

func substring(with nsrange: NSRange) -> String? {
             


        

Answer 1

Use Range(_, in:) to convert an NSRange to a Range in Swift 4.

extension String {
    func substring(with nsrange: NSRange) -> Substring? {
        guard let range = Range(nsrange, in: self) else { return nil }
        return self[range]
    }
}