[RndTbl] Funny comment

[Dan Martin]

Ruby is less terse (I prefer to say more readable) and many of its idioms
involve words.
However,
a = !!b  assigns the boolean value of b, and
a ||= b assigns b to a only if a is nil or false
(at the risk of being less readable)

-Dan

On Sat, Feb 28, 2015 at 8:53 AM, Sean Walberg <sean at ertw.com> wrote:

> 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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