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I've learned to love my dry erase board at work. When the mental block is on full it sometimes helps to step back and diagram the problem showcasing both flow and\or expectation of how the code is intended to work. More often than not, if there is a problem in logic, it becomes apparent from the flow and if it is a choice of code function, the expectation becomes apparent. Dry erase makes it easy to edit and if all else fails, I guess sniffing the marker comes to mind.

Great article Brian.

In reply to Re^2: brian's Guide to Solving Any Perl Problem by Rabbi Bob
in thread brian's Guide to Solving Any Perl Problem by brian_d_foy

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    [Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
    [Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
    [Corion]: (this time on Unix)
    [hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.
    [Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense
    [Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
    [Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'

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