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[REBOL] Re: Fun with literal blocks!

From: joel:neely:fedex at: 27-Oct-2000 10:12

Hi, Paul, [rebol-bounce--rebol--com] wrote:
> How can you reference the function your defining within itself. Is this > good practice? >
I'm not sure that I understand the question. If you mean "How can the definition to Fibon contain calls of Fibon?" Then I'd answer that this is simply the fact that Fibon is a recursive function. If you mean "Should Fibon be written as self-modifying code?" then (see my answer to Ladislav's comments on the same post) I'd answer that there are certainly some pros and cons to SMC. It is certainly a technique that should be used with care. OTOH, there are some very elegant things that can be done with functions that either: * maintain persistent state via SMC (less overhead vs full-blown objects), * construct and then evaluate code blocks "on the fly", or * can examine (and modify) their own operation for explanation or optimization. The whole history of AI is full of examples of the latter two. Please let me know if I failed to get your meaning. -jn- -- ; Joel Neely [joel--neely--fedex--com] 901-263-4460 38017/HKA/9677 REBOL [] do [ do func [s] [ foreach [a b] s [prin b] ] sort/skip do function [s] [t] [ t: "" foreach [a b] s [repend t [b a]] t ] { | e s m!zauafBpcvekexEohthjJakwLrngohOqrlryRnsctdtiub} 2 ]