"reverse" returns a list, not a hash; "keys" expects to see something that starts with %. So you could do this to actually dereference an anonymous hash (your version didn't actually make an anonymous hash):
print keys %{ { reverse %hash } };Of course you could have just done:
print values %hash;
(but of course non-unique values would be printed twice).
-Aaron
On Oct 19, 2004, at 9:50 AM, Jason Foster 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!
-- Aaron J. Mackey, Ph.D. Dept. of Biology, Goddard 212 University of Pennsylvania email: [EMAIL PROTECTED] 415 S. University Avenue office: 215-898-1205 Philadelphia, PA 19104-6017 fax: 215-746-6697
