I try postderef and key-value slice in Perl 5.19.5
I try postderef in Perl 5.19.5. The following code don't work.
my $params = {
foo => 1,
bar => 2,
baz => 3
};
my $new_params = {};
$new_params->%{'FOO', 'BAR'} = $params->%{'foo', 'bar'};
I expect {FOO => 1, BAR => 2}.
But left side assignment don't work. Is this specification or bug?
I'm Perl Programmer. I LOVE Perl. I want to contribute Perl community and Perl users.
That's not the way
->%{}is supposed to work.$a->%{foo}returnsfoo => $a->{foo}, and you can't assign to such a thing.You probably meant
$new_params->@{'FOO', 'BAR'} = $params->@{'foo', 'bar'};, which does the assignment you're looking for.dakkar
$new_params->@{'FOO', 'BAR'} = $params->@{'foo', 'bar'};thank you! That is what I want to do.
Why did you think you needed to switch sigils?
If you wrote this in traditional circumfix style, you wouldn’t write
because that doesn’t work either. You would write
And for postfix dereference you use exactly the same sigils as before.