然后在这里有个这样的数列，一个很好的用递归来实现的斐波那契i数列。
And so we've got it up here, a nice little recursive implementation of it.
问题在于，我们能否在不使用递归的前提下实现访问者模式？
The question is, can we implement the Visitor pattern without recursion?
使用first和rest 组合实现递归效果很好。
The combination of first and rest works well with recursion.
递归是否是实现函数的最好方式，一定需要吗？
Is recursion the best way to implement the routine - is it necessary ?
通过递归算法实现！找到最优路径，完成迷宫出口的查找！ - maze algorithm ！
To find the optimal path to complete the maze exports to search!
通过递归算法实现！找到最优路径，完成迷宫出口的查找！ - maze algorithm ！
To find the optimal path to complete the maze exports to search!
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