Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses
 
PerlMonks  

Re: Re: my $var; vs. use constant VAR = '';

by MeowChow (Vicar)
on Apr 27, 2001 at 01:12 UTC ( #75917=note: print w/replies, xml ) Need Help??


in reply to Re: my $var; vs. use constant VAR = '';
in thread my $var = ''; vs. use constant VAR => '';

Actually constants are faster, since use constant simply turns them into constant subs (for versions of Perl that support this):
sub CONST_NAME () { 'value' }
IIRC, this form is optimized by the Perl compiler such that there are no hits to the symbol table in dereferencing the value; it would be as if you typed the constant value in as a literal, much like a preprocessor #DEFINE macro.

update: Looks like I was wrong, my variables are actually a hair faster than both constants and even literal values.

   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://75917]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others surveying the Monastery: (4)
As of 2016-09-29 00:05 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Extraterrestrials haven't visited the Earth yet because:







    Results (543 votes). Check out past polls.