Leetcode - 83. Remove Duplicates from Sorted List

https://leetcode.com/problems/remove-duplicates-from-sorted-list/

Solution 1

/**
 * 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) {
  if (!head) {
    return null;
  }

  let curr = head;
  let next = head.next;

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

  return head;
};