Remove Duplicates from Sorted List | LeetCode 83

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Here is the full implementation.

/**
 * Definition for singly-linked list.
 * function ListNode(val) {
 *     this.val = val;
 *     this.next = null;
 * }
 */
/**
 * @param {ListNode} head
 * @return {ListNode}
 */
let deleteDuplicates = function(head) {
  let current = head;

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

  return head;
}