在Ruby中将值插入链表

class Node
  attr_accessor :value, :next

  def initialize(value)
    @value = value
    @next = nil
  end
end

class LinkedList
  attr_accessor :head, :tail

  def initialize
    @head = nil
    @tail = nil
  end
end

class LinkedList
  # ...

  def insert(value)
    new_node = Node.new(value)

    if @head.nil?
      @head = new_node
      @tail = new_node
    else
      @tail.next = new_node
      @tail = new_node
    end
  end
end

list = LinkedList.new
list.insert(1)
list.insert(2)
list.insert(3)