From: Aldric Giacomoni <aldric@...>
Date: 2009-11-18T03:24:43+09:00
Subject: Re: Trajectories

Caleb Clausen wrote:
> On 11/17/09, Marnen Laibow-Koser <marnen@marnen.org> wrote:
>>> Yeah, but you can't manipulate their results when they return one if
>>> they ever do as if they were numbers.
>>
>> Of course you can, unless I'm totally misunderstanding.  Got a concrete
>> example
> 
> The pi_over_4 method I posted earlier is a good one. You can't
> manipulate the _future_ result of that as if it were a number, because
> (among other things) it never returns. Need a lazy functional language
> for that kind of thing. (If that even suffices....)
> 
> _Maybe_ you could write a futures library and implement the pi_over_4
> formula within that in some kind of useful way, but idunno.... I kind
> of think you need laziness built into the core language for something
> like that to be useful.

Well, we -can- make laziness work.. Look at this:
http://innig.net/software/ruby/closures-in-ruby.rb
Do a search for 'fibonacci' and check out the lazy implementation.
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