<div dir="ltr">Ruby is less terse (I prefer to say more readable) and many of its idioms involve words. <div>However, </div><div>a = !!b assigns the boolean value of b, and</div><div>a ||= b assigns b to a only if a is nil or false</div><div>(at the risk of being less readable)</div><div><br></div><div>-Dan</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Feb 28, 2015 at 8:53 AM, Sean Walberg <span dir="ltr"><<a href="mailto:sean@ertw.com" target="_blank">sean@ertw.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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:<div><br></div><div><div>$ perl -e '$x=3; print "hi\n" while ($x --> 0)'</div><div>hi</div><div>hi</div><div>hi</div></div><div><br></div><div>Sean</div></div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Sat, Feb 28, 2015 at 1:38 AM, Trevor Cordes <span dir="ltr"><<a href="mailto:trevor@tecnopolis.ca" target="_blank">trevor@tecnopolis.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I had to confirm what $x=!!$y meant in perl. Remarkably, typing !! or<br>
"!!" or \!\! into google gives you nothing. Had to use English.<br>
<br>
Got this:<br>
<br>
<a href="http://stackoverflow.com/questions/2168406/what-does-double-exclamation-point-mean" target="_blank">http://stackoverflow.com/questions/2168406/what-does-double-exclamation-point-mean</a><br>
<br>
The +42 answer is quite good. Exec summary: !! is good for cleaning vars<br>
into 1 (true) or '' (false), which is important to keep warnings from<br>
complaining about undef vars.<br>
<br>
Anyhow, read the comments in the +42 answer. Hehehe.<br>
<br>
Let the flamewars begin!<br>
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</blockquote></div><br><br clear="all"><div><br></div></div></div><span class="HOEnZb"><font color="#888888">-- <br><div>Sean Walberg <<a href="mailto:sean@ertw.com" target="_blank">sean@ertw.com</a>> <a href="http://ertw.com/" target="_blank">http://ertw.com/</a></div>
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