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

Re^6: Perl bug ?

by tinita (Parson)
on Feb 06, 2013 at 13:20 UTC ( #1017422=note: print w/ replies, xml ) Need Help??


in reply to Re^5: Perl bug ?
in thread Perl bug ?

seems like the arguments for "for" are executed first and then the loop body. so:
the first element is $e && 0 which evaluates to $e. then the second argument is processed, autovivify happens.
when in the loop body, $e is an array reference already, and because the first element is an alias to $e it prints ARRAY(0xde0d48). seems logical to me.


Comment on Re^6: Perl bug ?
Select or Download Code
Re^7: Perl bug ?
by Corion (Pope) on Feb 06, 2013 at 13:23 UTC

    Yes. B::Deparse shows the same interpretation:

    Q:\>perl -MO=Deparse -E "my $e; say for $e && 0, $e->[0];" BEGIN { $^H{'feature_unicode'} = q(1); $^H{'feature_say'} = q(1); $^H{'feature_state'} = q(1); $^H{'feature_switch'} = q(1); } my $e; ; say $_ foreach ($e && 0, $$e[0]); -e syntax OK

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1017422]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (4)
As of 2014-08-30 23:03 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The best computer themed movie is:











    Results (294 votes), past polls