Hi Andrew,
On Sun, 12 Apr 2015 07:25:55 +0100
Andrew Solomon <[email protected]> wrote:
> Hi Frank
>
> I found the first one rather obscure, but they are equivalent.
No - they are not exactly the same. See below:
> 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;
> }
>
However, with this program:
< CODE >
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
{
my $self;
$self->{'DATA'} = { one => 'two', };
my $slot = $self->{'DATA'};
print "selfish self \n";
%{$self->{'DATA'}} = ( foo => 'bar' );
print Dumper $slot;
}
{
my $self;
$self->{'DATA'} = { one => 'two', };
my $slot = $self->{'DATA'};
print "selfless self \n";
$self->{'DATA'} = { foo => 'bar' };
print Dumper $slot;
}
< / CODE >
I am getting this output:
< SHELL >
shlomif@telaviv1:~$ perl Test-hash-clear.pl
selfish self
$VAR1 = {
'foo' => 'bar'
};
selfless self
$VAR1 = {
'one' => 'two'
};
shlomif@telaviv1:~$
< / SHELL >
So as can be seen, they are not exactly equivalent.
Regards,
Shlomi Fish
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Shlomi Fish http://www.shlomifish.org/
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