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Re^3: How can i debug compound map/grep statements just using print?

by LanX (Chancellor)
on Dec 01, 2012 at 19:36 UTC ( #1006631=note: print w/replies, xml ) Need Help??


in reply to Re^2: How can i debug compound map/grep statements just using print?
in thread How can i debug compound map/grep statements just using print?

Well you posted more than 10 times more code than necessary.

I said "with isolated code examples." =)

Take your new terse explanation as a standard for your coming posts. ;)

Cheers Rolf

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Re^4: How can i debug compound map/grep statements just using print?
by karlgoethebier (Prior) on Dec 01, 2012 at 20:10 UTC

    Well, but i have been advised to provide complete "solutions". So please don't be so apodictic.

    «The Crux of the Biscuit is the Apostrophe»

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[Corion]: hippo: If you have a Unicode-wise Perl then likely some zero-width characters in $x would work. Maybe $x = "\x{200b}" works.
[Corion]: Hmm - no, that outputs 1 for me on 5.14 - perl -wle "my $x = qq(\x{200b}); warn $x; warn length $x"
[hippo]: Smart - I'll give that a go. Thanks.
[hippo]: Ah
[Corion]: But maybe there is some other Unicode string that will be true but have a zero width
[hippo]: For explanation, I've seen this construct in someone else's code (no names, no pack drill) and couldn't think of a situation to trigger it.
[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)

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