28 Feb
2015
28 Feb
'15
7:38 a.m.
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-poin...
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!