On 09/25/2010 01:57 AM, Vaishnavi Saba wrote:
> @common = inter( \%foo, \%bar, \%joe );
> sub inter {
> my %seen;
> for my $href (@_) {
> while (my $k = each %$href ) {
> $seen{$k}++;
> }
> }
> return grep { $seen{$_} == @_ } keys %seen;
> }
Usually not a good practice to perform actions on @_ itself as it
carries parameters by reference rather than by value, and you're more
inclined to cause bugs further on. Common practice is to immediately
assign @_, or variables in @_ to local variables:
sub inter {
my @hashRefs = @_;
Also, as mentioned, you're not comparing anything of value in your grep,
rather if any of keys %seen == 3. And since keys %seen came from @_, is
there a reason for grepping over them and comparing that with @_?
>
> When I try printing the @_, I get the output as "HASH(0x40030354)
> HASH(0x400303d8) HASH(0x40037e98)".
These are the addresses of the hash-references in @_. You should try
using Data::Dumper:
use Data::Dumper;
print Dumper(@_); #or \...@_ rather
to see what is actually in the hashes.
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