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vrk's scratchpad

by vrk (Hermit)
on Mar 01, 2007 at 16:04 UTC ( #602708=scratchpad: print w/replies, xml ) Need Help??

Two neat concepts I noticed in perlsub and perlref in February, 2007:

# Try and catch using prototypes. (Almost verbatim from perlsub.) sub try (&$) { my ($try, $catch) = @_; eval { &$try; }; if ($@) { local $_ = $@; &$catch; } } sub catch (&) { $_[0] } try { die "phooey"; } catch { /phooey/ and print "unphooey\n"; };
# Nested subroutines. sub frobnicate { my $input = shift; local *grok = sub { my $input = shift; # grok's $input is lexical, and therefore # different from the outer $input. return $input . " grokked!"; }; # Note the semicolon. return grok($input); } print frobnicate('foo'), "\n"; # However, this will work as well. sub frobnicate_again { my $input = shift; local *grok = sub { return $input . " grokked!"; }; return grok($input); } print frobnicate_again('foo'), "\n";

I always wondered how to do the latter in Perl.


A feature not known to me, learned while reading Programming Perl (3rd ed.):

my $ip = 127.0.0.1; printf "%vd\n", $ip;
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[Corion]: Hmmm - Mano Negra or at least Manu Chao seem to put on a good live show. At least the one live CD I have from Manu Chao sounds good ;)
Discipulus feels the same jealousity of the johngg's daughter
[1nickt]: choroba I agree
[choroba]: Playing in a punk rock band for 20 years... my hearing is quite bad
[Corion]: I still have hopes to turn my godson and his two siblings into a punk band ;)
[Corion]: Their older sister just started piano but has been interested in drumming, which she should be able to start with 8 years or so)
[Discipulus]: ah was Kink of Bongo 1992..
[1nickt]: choroba name of band? youtube link? MySpace link?

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