Find largest node value of doubly linked list in node js

Js program for Find largest node value of doubly linked list. Here more information.

// Node JS program for
// Find max value in doubly linked list

// Define class of linked list Node
class LinkNode
{
	constructor(data)
	{
		this.data = data;
		this.next = null;
		this.prev = null;
	}
}
class DoublyLinkedList
{
	constructor()
	{
		this.head = null;
		this.tail = null;
	}
	// Insert new node at end position
	insert(value)
	{
		// Create a new node
		var node = new LinkNode(value);
		if (this.head == null)
		{
			// Add first node
			this.head = node;
			this.tail = node;
			return;
		}
		// Add node at last position
		this.tail.next = node;
		node.prev = this.tail;
		this.tail = node;
	}
	maximum()
	{
		if (this.head == null)
		{
			// When empty linked list
			return 0;
		}
		var result = this.head.data;
		// Get first node of linked list
		var temp = this.head;
		// iterate linked list 
		while (temp != null)
		{
			if (temp.data > result)
			{
				result = temp.data;
			}
			// Visit to next node
			temp = temp.next;
		}
		// Return maximum value
		return result;
	}
}

function main()
{
	var dll = new DoublyLinkedList();
	// Insert following linked list nodes
	dll.insert(14);
	dll.insert(31);
	dll.insert(12);
	dll.insert(15);
	dll.insert(11);
	dll.insert(25);
	console.log("Maximum  : " + dll.maximum());
}
// Start program execution
main();

Output

Maximum  : 31