Beefy Boxes and Bandwidth Generously Provided by pair Networks Bob
XP is just a number
 
PerlMonks  

Re^3: Secret Perl Operators: The Highlander's List Asserter

by ikegami (Pope)
on Jul 31, 2006 at 19:38 UTC ( #564847=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Secret Perl Operators: The Highlander List Asserter
in thread Secret Perl Operators: the boolean list squash operator, x!!

"Boolean Cast Operator" would be a less cryptic name than "Highlander Operator" for !!.

It's not even correct to say it returns 1. For example, print "[", !!1, "]" prints []. For a true argument, !! returns the dualvar 1/''.

Update: I got it backwards. True = dualvar (PVNV) 1/'1', False = dualvar (PVNV) 0/''.


Comment on Re^3: Secret Perl Operators: The Highlander's List Asserter
Select or Download Code
Re^4: Secret Perl Operators: The Highlander's List Asserter
by shmem (Canon) on Jul 31, 2006 at 19:47 UTC
    Hmm? Is that platform dependent? 
    lt-gm [gm] 21:43 ~ > perl -le 'print "[", !!1, "]"'        
[1]

    [download]

    Linux, perl 5.8.8. I choose "Higlander Operator" following the unstated naming conventions other secret operators follow ;-)

    --shmem 

    _($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}
[reply]
[d/l]

In Section Meditations

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://564847]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others pondering the Monastery: (20)
As of 2013-06-19 18:30 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How many continents have you visited?









    Results (664 votes), past polls