#203 - Remove Linked List Elements

Easy • View on LeetCode • View on GitHub

Problem Description

Given the head of a linked list and an integer val, remove all the nodes of the linked list that has Node.val == val, and return the new head.

Solution

/**
 * Definition for singly-linked list.
 * function ListNode(val, next) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 * }
 */
/**
 * @param {ListNode} head
 * @param {number} val
 * @return {ListNode}
 */
var removeElements = function(head, val) {
  if (!head) return null;
  head.next = removeElements(head.next, val);
  return head.val === val ? head.next : head;
};