Perl promotes laziness

# We need to open a set of files for writing, and reference the paths later;
# the hash gives us a nice way to work with them later.
my %lgfiles = ( pidfile => "${datadir}/${0}.pid",
errlog => "${datadir}/${0}.err"
... => ... );

# but how do we open the set of files?

# this is a lot of typing, but common style in some places
open PIDFILE, ">", $lgfiles{pidfile} or die "some message: $!";
open ERRLOG, ">", $lgfiles{errlog} or die "some message: $!";
open ..., ">", $lgfiles{...} or die "some message: $!";

# this is better, but still too much typing
my $msg = 'some message:';
open PIDFILE, ">", $lgfiles{pidfile} or die "$msg $!";
open ERRLOG, ">", $lgfiles{errlog} or die "$msg $!";
open ..., ">", $lgfiles{...} or die "$msg $!";

# this is handy
# open each key in %lgfiles for writing to as KEY
while (my ($k, $v) = each %lgfiles) {
open uc($k), '>', $v or die "can't open $v: $!";

# same thing, but faster to read (IMHO)
# open each key in %lgfiles for writing to as KEY
map {
my $fn = $lgfiles{$_};
open uc($_), '>', $fn or die "can't open $fn: $!";
} keys %lgfiles;

For some reason, the intregration of regular expressions, qw/quote words/, map {} @list, grep {} @list, the $_ default variable, and the do_something or die $! thing are my favorite features of Perl. While in most other languages, the only great feature I get to enjoy is the trinary/ternary ?: operator, when there’s a place that it improves readiblity and reduces visual clutter ;-).

Ok, so my biggest beefs about Python 2.5 is no ? : and having to import re, hehe