AppDelegate.swift

//
//  AppDelegate.swift
//  Moof
//
//  Created by 1024jp on 2019-10-10.
//  © 1024jp
//

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    func applicationDidFinishLaunching(_ aNotification: Notification) {
        
        let path = NSString(string: "foo").appendingPathComponent("bar")
        print((path as NSString).className)  // -> NSPathStore2
        
        let range = path.range(of: "foo/bar")!
        let substring = path[range]  // -[NSPathStore2 characterAtIndex:]: index (7) beyond bounds (7)
        print(substring)
    }

}