Insert node at a tail of Linked List | HAckerRank

insertNodeAtTail.js

// https://www.hackerrank.com/challenges/insert-a-node-at-the-tail-of-a-linked-list/problem
function insertNodeAtTail(head, data) {

    var newNode = new SinglyLinkedListNode(data);
    if(head===null){
        head = newNode;
        return head;
        
    }else{

       var tmp = head;
       while(tmp.next!==null){
       tmp = tmp.next;
        
    }

    tmp.next = newNode;
    return head;

    }


}