Example to iterate over a linked list like the responder chain

LinkedList.swift

import Cocoa

let window = NSWindow(contentRect: NSRect(origin: .zero, size: NSSize(width: 500.0, height: 500.0)), styleMask: 0, backing: .Buffered, defer: false)


var responder = window.firstResponder
var responderIndex = 1
repeat {
    print("Responder: \(responder)")
    
    if let nextResponder = responder.nextResponder {
        responder = nextResponder
        responderIndex = responderIndex.successor()
    } else {
        break
    }
} while true

Yay for Swift 3!!!

for responder in sequence(first: window.firstResponder, next: { $0.nextResponder }) {
    print("Responder: \(responder)")
}