Effectively insert node at beginning of circular linked list in swift

Swift program for Effectively insert node at beginning of circular linked list . Here more information.

import Foundation
// Swift 4 Program 
// Insert node at beginning of circular linked list
// Using head and tail nodes

// Define class of linked list Node
class LinkNode
{
	var data: Int;
	var next: LinkNode? ;
	init(_ data: Int, _ first: LinkNode? )
	{
		// Set node value
		self.data = data;
		self.next = first;
	}
}
class CircularLinkedList
{
	var head: LinkNode? ;
	var tail: LinkNode? ;
	init()
	{
		self.head = nil;
		self.tail = nil;
	}
	// Insert node at begining of circular linked list
	func insert(_ value: Int)
	{
		// Create a node
		let node: LinkNode? = LinkNode(value, self.head);
		if (self.tail == nil)
		{
			// First node of linked list
			self.tail = node;
		}
		// Make new head
		self.head = node;
		// Connecting the last node to the top of the next field
		self.tail!.next = self.head;
	}
	// Display node element of circular linked list
	func display()
	{
		if (self.head == nil)
		{
			print("Empty Linked List");
		}
		else
		{
			print("Linked List Element :", terminator: "");
			var temp: LinkNode? = self.head;
			// iterate linked list
			while (temp  != nil)
			{
				// Display node
				print(" ",
					temp!.data, terminator: " ");
				if (temp === self.tail)
				{
					// Stop iteration
					// Or break;
					return;
				}
				// Visit to next node
				temp = temp!.next;
			}
		}
	}
	static func main(_ args: [String])
	{
		let task: CircularLinkedList? = CircularLinkedList();
		// Add following linked list nodes
		task!.insert(8);
		task!.insert(7);
		task!.insert(6);
		task!.insert(5);
		task!.insert(4);
		task!.insert(3);
		task!.insert(2);
		task!.insert(1);
		// Display node
		task!.display();
	}
}
CircularLinkedList.main([String]());

Output

Linked List Element :  1   2   3   4   5   6   7   8


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