Remove Duplicatesfrom Sorted List

Remove Duplicates from Sorted List Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well. Example 1: Input: head = [1,1,2] Output: [1,2] Example 2: Input: head = [1,1,2,3,3] Output: [1,2,3] Constraints: The number of nodes in the list is in the range [0, 300]. -100 <= Node.val <= 100 The list is guaranteed to be sorted in ascending order. * Definition for singly-linked list. function ListNode(val, next) { this.val = (val===undefined ? 0 : val) this.next = (next===undefined ? null : next) } * @param {ListNode} head @return {ListNode}

var deleteDuplicates = function (head) {
  let current = head;

  while (current) {
    if (current.next && current.val === current.next.val) {
      current.next = current.next.next;
    } else {
      current = current.next;
    }
  }

  return head;
};