Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Re: How does 'goto LABEL' search for its label?

by Anonymous Monk
on Jan 16, 2013 at 15:32 UTC ( [id://1013589]=note: print w/replies, xml ) Need Help??


in reply to How does 'goto LABEL' search for its label?

goto says (among other things)

Use of "goto-LABEL" or "goto-EXPR" to jump into a construct is deprecated and will issue a warning. Even then, it may not be used to go into any construct that requires initialization, such as a subroutine or a "foreach" loop. It also can't be used to go into a construct that is optimized away.

So LABELs are like lexicals, except with only file-scope or subroutine-scope ( Lexical scoping like a fox )

lexical(my) variables from one loop/block is not visible in another, but labels are , because they currently have file scope (like my $foo at the top of a file outside of any bare blocks)

currently { L: say 1; } is like my $L; { $L=1; say $L; }

But this will change, once  Use of "goto" to jump into a construct is deprecated is disallowed, labels will be lexically scoped like my $vars

someday { L: say 1; } is like { my $L=1; say $L; }

Replies are listed 'Best First'.
Re^2: How does 'goto LABEL' search for its label?
by Anonymous Monk on Jan 16, 2013 at 17:28 UTC

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://1013589]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others studying the Monastery: (5)
As of 2024-04-25 15:53 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found