Hi Tim, if your concern seems to you to be related to rambo 3903 http://www.rebol.net/cgi-bin/rambo.r?id=3909 maybe you should bump it up
On 9/30/05, Tim Johnson <[EMAIL PROTECTED]> wrote: > > > Hello Rebols: > > A unique and very valuable feature of rebol is that control loops > *can* have return values. But consistancy in that matter is very > important and I'm finding that control loops don't *always* return > values if empty data sets are being processed. > > Here's some examples which illustrates what can happen with such > inconsistancies: > t: foreach item [][item] ;; empty data argument > == none ;; that's a good thing. It would be even better > ;; If I cound set a default return value > ;; Now let's try 'loop > >> i: 1 > == 1 > >> t: loop 6[i: i + 1] > == 7 > >> t > == 7 ;; okay, we got a return value, the last block evaluated > ;; now let's suppose we use a 0 as 'loop's 'count argument > >> t: loop 0[i: i + 1] > ** Script Error: t needs a value > ** Near: t: loop 0 [i: i + 1] > Applying 'repeat to an empty series gives the same. > >> t: repeat ch ""[ch] > ** Script Error: t needs a value > ** Near: t: repeat ch "" [ch] > ;; and 'repeat operating on a non-empty series: > >> t: repeat ch "ab"[ch] > == #"b" > >> t > == #"b" > ;; inconsistent! > > ;; Now I'm going to be a bit of a curmudgeon here: > I do *not* believe it is good programming style to write a piece of > code (a subroutine in this case) that might return a value in one > case and not return a value in another case. I would strongly > advocate that this is an inconsistency that should be corrected. > > IOWS: Either *always* no return values (as in 'print) or *always* > a return value (as in 'foreach) > > I'd welcome other comments and observations on this matter. Maybe > I've completely missed something here. > > MTCW > Tim > > -- > Tim Johnson <[EMAIL PROTECTED]> > http://www.alaska-internet-solutions.com > -- > To unsubscribe from the list, just send an email to > lists at rebol.com <http://rebol.com> with unsubscribe as the subject. > > -- ... nice weather eh -- To unsubscribe from the list, just send an email to lists at rebol.com with unsubscribe as the subject.
