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Perhaps consider this: Updated code to be perhaps more helpful...
I think an issue here that when you "say", you have to say what you want to "say"!
use strict; use warnings; use Data::Dumper; use v5.10; sub f {a=>1,b=>2} my %result = f(); #converts a a hash passed as an arry #back into a hash print Dumper \%result; print "to print just the keys of the hash:\n"; say "$_" for keys %result; # this is much faster, execution wise... # passes back a referecne to a hash that has # been already been created. sub x { my %result; $result{a}=1; #more likely way to set the results $result{b}=2; return \%result; } my $hash_ref = x(); print "to print the keys of this hash\n"; print "$_\n" for keys (%$hash_ref); print Dumper $hash_ref; __END__ $VAR1 = { 'b' => 2, 'a' => 1 }; to print just the keys of the hash: b a to print the keys of this hash a b $VAR1 = { 'a' => 1, 'b' => 2 };
PS: I did find that say for keys %{{f}}; did indeed work.
I didn't expect that result, but it does "work".
I find say "$_" for keys %{{f}}; to be easier to understand. However, Perl is gonna make a hash from the return value of f() whether or not you give it name. I prefer the above syntax.

In reply to Re: Using 'keys' on a list by Marshall
in thread Using 'keys' on a list by lammey

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