Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

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

by Anonymous Monk
on Jan 16, 2013 at 15:32 UTC ( #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; }


Comment on Re: How does 'goto LABEL' search for its label?
Download Code
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
Node Status?
node history
Node Type: note [id://1013589]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (15)
As of 2015-07-06 10:32 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (71 votes), past polls