Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re: Still don't undersand "Modification of a read-only value attempted" error

by derby (Abbot)
on Jun 20, 2012 at 22:02 UTC ( #977488=note: print w/ replies, xml ) Need Help??


in reply to Still don't undersand "Modification of a read-only value attempted" error

$item is always an alias. In the 'failing' foreach, it's an alias to a constant in a list and hence not modifiable (where would perl save the modification?) For the 'working' foreach, $item is an alias to an array element which is modifiable (since we have some place to save the modification). So either use your array or make a copy of the aliased item:

(my $val = $item) =~ s/abc/zzzzzz/;

-derby


Comment on Re: Still don't undersand "Modification of a read-only value attempted" error
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://977488]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (6)
As of 2014-12-29 07:12 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    Is guessing a good strategy for surviving in the IT business?





    Results (185 votes), past polls