移除链表元素

Question

function removeNode(head, val) {
  const dummyNode = new ListNode();
  dummyNode.next = head;
  let prev = dummyNode;
  let cur = head;
  while (cur) {
    if (cur.val === val) {
      prev.next = cur.next;
    } else {
      prev = cur;
    }
    cur = cur.next;
  }

  return dummyNode.next;
}