The program needs to check and see if the current node is the NULL list.

程序需要检查确认当前节点是否为NULL列表。

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The last example, (), is used to refer to the empty, or null, list.

最后一个示例 ()用来表示一个空列表。

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If the list is null, require will throw an exception.

如果这个列表是null,require会抛出一个异常。

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If the list is null, require will throw an exception.

如果这个列表是null,require会抛出一个异常。

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