Re: Should loops return a value?

[Ville Jungman]

But the analogy with return/last is likely to confuse -- why can
you use retlast() in places where neither return() or last() make
any sense?
You are mainly right. I was perhaps too fast and careless when writing that 
example. Also return and retlast were just the first words that came in to 
my mind (from pl/sql) so perhaps they might also remind of exiting a 
subroutine or something. So, there might be better words to that command - 
if that needs a command at all. For example with that example (see below) - 
of course - there's no need of command to do it, because default values will 
be fine.

But i think You perhaps miss my point that is to make these constructs 
simplier and one solution for not every - but every possible case - to 
defaultly and with no gimmicks to return values from loops or some other 
constructs. I have not yet all answers ready how to cope with all of them 
but ideas have been developed during this discussion.

  ($x, $y) = do {
    if ($condition) { 42, 43 }
    else            { 44, 45 }
  };
I didn't know the if works already like that. I think it'd be just perfect 
if it could be written without 'do' like this:

  ($x, $y) =
     if ($condition) { 42, 43 }
     else               { 44, 45 };
I don't know if it's yet possible to write it like this (and can't try it 
just now). If it is i am satisfied with it and think only other constructs.

But the analogy with return/last is likely to confuse -- why can
you use retlast() in places where neither return() or last() make
any sense?
I agree, retlast is extremely stupid with this example.

Thanks for the constructive comments,

ville jungman, 2 laureston crescent, tower, blarney, cork, ireland
tel. + 353 - 21 - 451 6847, http://www.kolumbus.fi/vilmak
usko Herraan Jeesukseen, niin sinä pelastut. (apt. 16:31)
From: Steve Grazzini <[EMAIL PROTECTED]>
To: Ville Jungman <[EMAIL PROTECTED]>
CC: [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: Re: Should loops return a value?
Date: Mon, 29 Sep 2003 16:19:17 -0400
On Mon, Sep 29, 2003 at 11:04:46PM +0300, Ville Jungman wrote:
> This is real example from what i was doing yesterday:
>   if($subs->anna_tilavuus($x+$lisax,$y+$lisay,$z) < 100){
>      $subs->paivita($x);
>      $udat{x}=$lisax;
>      $udat{y}=$lisay;
>   }elsif($subs->anna_tilavuus($x,$y+$lisay,$z) < 100){
>      $udat{y}=$lisay;
>   }
>
> If using return values, this could be wrote as:
>   ($udat{x},$udat{y})=
>      if($subs->anna_tilavuus($x+$lisax,$y+$lisay,$z) < 100){
>         $subs->paivita($x);
>         retlast($lisax,$lisay)
>      }elsif($subs->anna_tilavuus($x,$y+$lisay,$z) < 100){
>         retlast(undef,$lisay);
>      }
>   ;
You can do this already with "do" blocks.

  my $condition = 1;

  ($x, $y) = do {
    if ($condition) { 42, 43 }
    else            { 44, 45 }
  };
  print "$x : $y\n";

If it makes you happy, you can even add -->

  sub retlast { @_ }

But the analogy with return/last is likely to confuse -- why can
you use retlast() in places where neither return() or last() make
any sense?
--
Steve
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