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Postings from May 2001
On Wed, May 02, 2001 at 11:13:13AM +0200, Alexander Farber (EED) wrote:
> I would like to propose adding the "last" statement
> to the "grep", which currently doesn't work:
For the record, I have no problem with this. :)
> maas34: perl -e 'grep { print and $_ == 3 and last } (1,2,3,4,5)'
> 123
> Can't "last" outside a loop block at -e line 1.
>
> This way it would be possible to use such constructs:
FYI, its not hard to write a routine to do just that...
first { some_condition } @stuff;
sub first (&@) {
my($cond, @stuff) = @_;
my $first;
foreach (@stuff) {
if( &$cond ) {
$first = $_;
last;
}
}
return $first;
}
print first { $_ > 5 } 1..10;
6
And I'm quite sure there's an RFC for doing something like this alread
up for Perl 6.
> Here I am looking for a button with a special name - "Delete ..." -
> and there can be only one such button, so I have to interrupt the
> "grep" after I find it (otherwise the $1, $2, $3, $4 might be unset).
(grep {...} @stuff)[0] will work, but its inelegant.
--
Michael G. Schwern <schwern@pobox.com> http://www.pobox.com/~schwern/
Perl6 Quality Assurance <perl-qa@perl.org> Kwalitee Is Job One
Maybe they hooked you up with one of those ass-making magazines.
-- brian d. foy as misheard by Michael G Schwern
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