Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much
 
PerlMonks  

Re: Does perl sub using stack and possible to crash?

by Corion (Patriarch)
on Jan 17, 2013 at 10:13 UTC ( [id://1013744]=note: print w/replies, xml ) Need Help??


in reply to Does perl sub using stack and possible to crash?

Global variables are global, and @_ are aliases. This is easily replicated and tested with the following code (your while loop will never terminate so I used a for loop instead):

#!perl -w use strict; use Data::Dumper; my @someNameArray = qw(foo bar baz); print Dumper \@someNameArray; for(@someNameArray){ print( "Before: $_\n" );# $_ correct frobnicate($_); print( "After : $_\n" );# $_ changed } print "Final:\n"; print Dumper \@someNameArray; sub frobnicate { $_[0] = "changed value from '$_[0]'"; }; __END__ $VAR1 = [ 'foo', 'bar', 'baz' ]; Before: foo After : changed value from 'foo' Before: bar After : changed value from 'bar' Before: baz After : changed value from 'baz' Final: $VAR1 = [ 'changed value from \'foo\'', 'changed value from \'bar\'', 'changed value from \'baz\'' ];

If you

I suggest to use a lexical iterator instead of $_, and don't have your callees change elements in @_. Using a lexical iterator prevents action at a distance from called subroutines. Using @_ will need more changes and information about $finder->isExist(...).

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://1013744]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others browsing the Monastery: (4)
As of 2024-03-19 13:57 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found