Hi Frank
I found the first one rather obscure, but they are equivalent. To prove
this, Data::Dumper is my friend:
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
{
my $self;
print "selfish self \n";
%{$self->{'DATA'}} = ( foo => 'bar' );
print Dumper $self;
}
{
my $self;
print "selfless self \n";
$self->{'DATA'} = { foo => 'bar' };
print Dumper $self;
}
Hope that helps,
Andrew
On Sun, Apr 12, 2015 at 7:06 AM, shawn wilson <[email protected]> wrote:
>
> On Apr 12, 2015 12:23 AM, "SSC_perl" <[email protected]> wrote:
> >
> > Could someone please explain the difference between:
> >
> > %{$self->{'DATA'}} = () }
> >
>
> The hashref of key "DATA" equals an empty list. The trailing bracket is
> the end of the else block. $self is also probably blessed (an object).
>
> ref($self->{DATA}) eq 'HASH'
>
> > and
> >
> > $self->{'DATA'} = {}
> >
>
> Same
>
> > I was told that they are equivalent, but they're not. One works
> and the other doesn't, so they must be different. Here's the context:
> >
> > --------------------
> >
> > sub empty_db {
> > my $self = shift;
> > if ($self->{'USEDBM'} eq 'sql') {
> > $self->{'SQL'}->do("DELETE from $self->{'DB'}") or
> $self->{'ERRMSG'} .= $DBI::errstr and return;
> > }
> > else { %{$self->{'DATA'}} = () }
> > # else { $self->{'DATA'} = {} } # This does nothing
> > }
> >
>
> IDK where this is from, but I'd question the wisdom of running this
> code...
>
--
Andrew Solomon
Mentor@Geekuni http://geekuni.com/
http://www.linkedin.com/in/asolomon
