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Re: Re: Perl Programming guidlines/rules

by BUU (Prior)
on Nov 21, 2002 at 23:48 UTC ( #214958=note: print w/replies, xml ) Need Help??

in reply to Re: Perl Programming guidlines/rules
in thread Perl Programming guidelines/rules

I support using $_, but you should perhaps implement a standard/guideline in the form of 'Localize $_ in all user created subs', as something like the following:
sub foo{my $blah=shift; $_=substr $blah,0,1; /foo/;}
Which looks fairly innocuous in the use of $_ to avoid more temporary vars (It's not an extremely good example, but it serves), but then you do something likemap{foo($_->[0]);$_;} which can return wildly different results then you expected, and lead to many.. interesting.. bugs.

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Re: Re: Re: Perl Programming guidlines/rules
by belden (Friar) on Nov 22, 2002 at 17:13 UTC
    Wow, that really localizes $_ ? To me, it looks more like a straight assignment to $_. I would've expected something like:

    sub foo { local $_ = shift; /foo/; }


      No, it doesn't localize, and I'm fairly certain that BUU was pointing out that failing to do so is dangerous.

      Makeshifts last the longest.

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