On Thursday 29 Apr 2010, Shlomi Fish wrote:
> On Thursday 29 Apr 2010 14:39:11 Akhthar Parvez K wrote:
> > There was a typo in my original email. I missed the word "not" which was
> > very crucial as always.
> >
> > Scenario: #1
> > unless ( (defined $result) && ($test !~ /TEST/) )
> > { my $result = "OK";
> > print "$result\n";
> > }
>
> This unless with a negative test inside confuses me. Other people have
> replied
> so I'll just share a joke from Freenode's #perl:
>
> [quote]
> <polak> mauke: so how does that "translate" into eng
> <merlyn> "eng"?
> <mauke> I spe eng goo
> <rindolf> mauke: I spe eng wel
> <rindolf> I spe goo eng
> <sts> just a short question. besides personal preference is there
> any difference if you use if(! or unless(?
> <rindolf> sts: no.
> <rindolf> sts: they do the same thing.
> <Botje> sts: pfft. Real Men(tm) use unless(!...)
> <rindolf> Botje: heh.
> <sts> lol unless(! makes sense. thanks Botje, i'll rather use this
> one. =D
> <LeoNerd> For me it's a readability thing - I express what seems more
> likely
> <rindolf> Botje: File::HomeDir used to have a triple or quadruple
> negative in one of its test files.
> <Botje> unless(! $str !~ /(?!foo)/)
> <rindolf> Botje: heh
> <merlyn> whoa
> <merlyn> unless (!) makes no sense to me at all
> <Botje> of course not.
> <sts> Botje: wow!
> <Botje> it's still cool to confuse people with :]
> <LeoNerd> Heh.. Should just use !!! in there anywa y:)
> <merlyn> it's 7 characters too many
> <xand> some people don't understand double negatives
> <merlyn> I don't want no complaints!
> <Botje> xand: you mean don't not understnad?
> <LeoNerd> We don't know nobody who don't want no double-negatives
> <sts> Botje: what does (?!foo) do?
> <nanonyme> lol
> <xand> Botje: don't not misunderstand
> <mauke> Botje: that always executes the block
> <merlyn> there's an argument that can be successfully made that "I
> don't want no complaints" doesn't necessarily work logically
> <Botje> xand: oh, I don't not think I didn't not misunderstand you.
> <Botje> mauke: I know. it just looks cool.
> <mauke> and you want !($str !~ /.../)
> <xand> don't you?#
> <merlyn> so it might actually mean what people think they're meaning
>
> -- N-uple negative on Freenode's #perl
> -- #perl, Freenode
> [/quote]
>
> (From:
> http://www.shlomifish.org/humour/fortunes/sharp-perl.html#n-uple-negative
> )
>
> I should note that I never use unless in my code because from some reason it
> mentally confuses me and I always have to transform it into if (!) in my
> head.
> Maybe it's a language thing (Mixed Hebrew/English cognition, in my case). As
> opposed to Uri I am using !~ (inside an if or an if clause) and read it as
> "does not match" and it's OK.
>
> Regards,
>
> Shlomi Fish
>
That was kewl Shlomi. But sometimes it's fun to play with something which
you've no clue over, and eventually confuse yourself :-P At the end of the day,
you'll learn something out of it and that's what you want to do :-)
--
Regards,
Akhthar Parvez K
http://Tips.SysAdminGUIDE.COM
UNIX is basically a simple operating system, but you have to be a genius to
understand the simplicity - Dennie Richie
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