despite the many shortcuts perl offers the lazy programmer via the $_ variable by using it as a default argument in many functions, I realized that I could wrest even more optimization from perl by glomming this function onto common math operations!
For instance, if you're writing a quickie script to do some tallying, you might have line after line of $_+=10;
$_+=$n;
and so on. No more with the ARGHelper.
turn $_+=20 into +=20 and $_++ into the delightful ++! that's a savings of half your keystrokes right there! Handles ++, --, and all op= operators!
In case you're still having difficulty, here's a sample script :
#! perl -l
use ARGHelper;
$_=10;
+=2;
**=2;
print;
package ARGHelper;
use Filter::Simple;
FILTER_ONLY
code => sub {
my $nl = qr/(\n?;\n?)|&&|\|\|/sm;
s/($nl)\s*?--\s*?($nl)/$1\$_--$2/smg;
s/($nl)\s*?\+\+\s*?($nl)/$1\$_++$2/smg;
print;
my @ops = ('**=', '+=', '*=', '&=',
'<<=', '&&=', '-=', '/=',
'|=', '>>=', '||=', '.=',
'%=', '^=', 'x=');
foreach my $op (@ops) {
my $qo = quotemeta $op;
s/($nl)\s*?$qo/$1\$_$op/smg;
}
}
;
return 1;