203. Remove Linked List Elements

Remove all elements from a linked list of integers that have value val.

Example:

Input:  1->2->6->3->4->5->6, val = 6
Output: 1->2->3->4->5

def remove_elements(head, val)
    return nil if head.nil?
    node = head
    while node.next != nil
      if node.next.val == val
        node.next = node.next.next
      else
        node = node.next
      end
    end
    if head.val == val
      head = head.next
    end
    head
end