[RndTbl] Funny comment

Sean Walberg sean at ertw.com
Sat Feb 28 08:53:18 CST 2015


Thanks for pointing that out. TIL --> which is another example of "two
operators smashed together does something cool". Too bad it doesn't work in
Ruby, but it does in Perl:

$ perl -e '$x=3; print "hi\n" while ($x --> 0)'
hi
hi
hi

Sean

On Sat, Feb 28, 2015 at 1:38 AM, Trevor Cordes <trevor at tecnopolis.ca> wrote:

> I had to confirm what $x=!!$y meant in perl.  Remarkably, typing !! or
> "!!" or \!\! into google gives you nothing.  Had to use English.
>
> Got this:
>
>
> http://stackoverflow.com/questions/2168406/what-does-double-exclamation-point-mean
>
> The +42 answer is quite good.  Exec summary: !! is good for cleaning vars
> into 1 (true) or '' (false), which is important to keep warnings from
> complaining about undef vars.
>
> Anyhow, read the comments in the +42 answer.  Hehehe.
>
> Let the flamewars begin!
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-- 
Sean Walberg <sean at ertw.com>    http://ertw.com/
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