From: Tim Hunter <TimHunter@...>
Date: 2007-11-11T23:21:16+09:00
Subject: Re: The Man or Boy Recursion Test

Lloyd Linklater wrote:
> Tim Hunter wrote:
>> Werner wrote:
>>> Is there anyone who could enlighten me?
>>>
>>> Thanks and Best Regards
>>>
>>> Werner Dahn
>>>
>> # Man or boy test
>> def a(k, x1, x2, x3, x4, x5)
>>    b ||= Proc.new { k -= 1; a(k, b, x1, x2, x3, x4) }
>>    return k <= 0 ? x4[] + x5[] : b[]
>> end
>>
>> puts a(10, Proc.new {1}, Proc.new {-1}, Proc.new {-1}, Proc.new {1},
>> Proc.new {0})
> 
> Nice post, Tim.  I tested it and, when it gave the correct answer, I 
> decided to share it with the world.
> 
> http://en.wikipedia.org/wiki/Man_or_boy_test

Sweet!

I realized last night that the ||= is superfluous. A simple assignment 
is enough.

b = Proc.new { k -= 1; a(k, b, x1, x2, x3, x4) }


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