From: Mikael Brockman <phubuh@...>
Date: 2004-07-07T02:48:06+09:00
Subject: Re: Functional Ruby (Re: Why I don't use Ruby.)

Joel VanderWerf <vjoel@PATH.Berkeley.EDU> writes:

> Mikael Brockman wrote:
>> In Scheme, sum would be:
>>  (define (sum xs)
>>    (if (null? xs)
>>       0
>>      (+ (car xs) (sum (cdr xs)))))
>
> Ruby doesn't optimize this tail recursion, but Scheme does. That's one
> way Scheme could be said to be more "functional".

There's no tail recursion in that function, but you have a point.  TCO
would be nice, but it's easy to perform the optimization manually.

  mikael