Delete a node in a linked list whose head is not given

DeleteLinkedListNode.swift

import UIKit
import PlaygroundSupport

class Node {
  var data: Int
  var next: Node?
  
  init(data: Int) {
    self.data = data
  }
}

class LinkedList {
  var head: Node?
  
  init(head: Node?) {
    self.head = head
  }
  
  func printList() {
    print("list is: ")
    var node: Node? = head
    while let current = node {
      print(current.data)
      node = current.next
    }
  }
  
  func delete(node: Node) {
    node.data = node.next?.data ?? -1
    node.next = node.next?.next
  }
}



let node2 = Node(data: 2)
let node4 = Node(data: 4)
let node7 = Node(data: 7)
let node10 = Node(data: 10)

node2.next = node4
node4.next = node7
node7.next = node10
let ll2 = LinkedList(head: node2)
ll2.printList()

ll2.delete(node: node4)
ll2.printList()