Re: Dynamically creating a hash for keys()

Vladi Belperchinov-Shabanski <[email protected]>:

:skip values:
:
:%hash = qw( fred filntstone barney rubble tom delong );
:print( map { $a=!$a ? $_ : () } reverse( %hash ) );
:
:perhaps not too bad map() example :)
:
:P! Vladi.


Or, you can do it the regular old un-fun way, and just use a 
second, temporary hash:

my %hash = qw(fred flintstone barney rubble tom delong);
my %hsah = reverse %hash;
print keys %hsah;



:On Tue, 19 Oct 2004 09:50:39 -0400
:Jason Foster <[email protected]> wrote:
:
:> Can anyone help me to understand why this code refuses to compile?  
:> Even better, can anyone help fix it :)
:> 
:>      %hash = qw( fred filntstone barney rubble tom delong );
:>      print( keys( reverse( %hash ) ) );
:> 
:> The error message...
:> 
:>      Type of arg 1 to keys must be hash (not reverse) at ./killme.pl 
:> line 4, near ") ) "
:> 
:> ... was pretty confusing since it implies that "reverse" is a type?!
:> 
:> I tried making an anonymous hash as follows...
:> 
:>      print( keys( %{ reverse( %hash ) } ) );
:> 
:> ... but got no results at all.
:> 
:> Help!
:> 
:> 
:
:
:-- 
:Vladi Belperchinov-Shabanski <[email protected]> <[email protected]>
:http://cade.datamax.bg/
:Cross the ocean deep, wake now from your sleep
:Kiss the past goodbye, don't follow empty skies...
:
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-- 
DVS
Dandelions are weak.