Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid
 
PerlMonks  

Re: (nearly) readonly globals

by BrowserUk (Patriarch)
on Jan 19, 2009 at 20:18 UTC ( [id://737394]=note: print w/replies, xml ) Need Help??


in reply to (nearly) readonly globals

Is there a bug? Are the docs ambiguous?

No. And No. Using local creates a temporary instance of the named variable, and you can do what you like with it.

That WAD (Working As Designed)


Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

Replies are listed 'Best First'.
Re^2: (nearly) readonly globals
by haoess (Curate) on Jan 19, 2009 at 20:32 UTC
    Using local creates a temporary instance of the named variable, and you can do what you like with it.

    But this does not apply to all special globals, i.e.:

    % perl -e 'local $1 = 1' Modification of a read-only value attempted at -e line 1. % perl -e 'local $^S = 1' Modification of a read-only value attempted at -e line 1.

    -- Frank

        I don't give up:

        % bleadperl -Mstrict -wE 'for $1 ( 10..13 ) { say $1 }' 10 11 12 13

        And now, these globals loose their magic:

        % bleadperl -Mstrict -wE 'for $1 ( 10..13 ) { $1 =~ /^(\d)/; say $1 }' 10 11 12 13

        -- Frank

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://737394]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others rifling through the Monastery: (6)
As of 2024-04-16 05:37 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found