[REBOL] Re: Evaluating if's
From: nitsch-lists:netcologne at: 2-Jul-2002 9:48
Am Dienstag, 2. Juli 2002 05:51 schrieb Charles:
> Here's a little question. Perhaps I've been spoiled in other languages,
> but this is starting to frustrate me. I have something like:
> if THIS and THAT []
> Thing is, if THIS is false, it continues to evaluate THAT anyways. What's
> the point? The result is obviously false anyways. I'm working on a case
> like this (perhaps someone can provide a more elegant solution):
> if (2 = length? p: parse filename ".") AND (not none? find pick p 2
> "htm") [ ...
> Obviously, if the first condition is false, I want it to quit without
> evaluating the second condition. Help? Any way I can continue doing this
> in the same line, and without worrying about throwing and catching errors?
> Or am I more or less doomed to yet another nested if? Thanks folks.
>
short circuits in rebol are 'all and 'any
if all[ 2 = length? p: parse filename "." not none? find pick p 2 "htm" ][
'any is "or"
> --Charles
-Volker
