Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

Re^2: Concatenate or Join?

by tobyink (Abbot)
on Nov 12, 2012 at 20:54 UTC ( #1003507=note: print w/replies, xml ) Need Help??


in reply to Re: Concatenate or Join?
in thread Concatenate or Join?

It depends what you're doing really. In your example, join beats concat, but that's because you are looping through an array. Here though, concatenation beats it (albeit only by about 10%):

use strict; use warnings; use Benchmark qw{ cmpthese }; sub foo { 'abc' }; sub bar { 'def' }; cmpthese( -3, { concat => sub { my $ret = foo().bar(); return $ret; }, join => sub { my $ret = join q{}, foo(), bar(); return $ret; }, });

And here (thanks to the Perl compiler being so good at constant folding) concatenation is more than twice as fast as join:

use strict; use warnings; use Benchmark qw{ cmpthese }; sub foo () { 'abc' }; sub bar () { 'def' }; cmpthese( -3, { concat => sub { my $ret = foo . bar; return $ret; }, join => sub { my $ret = join q{}, foo, bar; return $ret; }, });
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1003507]
help
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (5)
As of 2017-01-24 05:14 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you watch meteor showers?




    Results (203 votes). Check out past polls.