Assigning anonymous hash to a list
Abigail
abigail at abigail.be
Tue Jul 30 20:40:08 BST 2013
On Tue, Jul 30, 2013 at 08:15:06PM +0100, Peter Flanigan wrote:
> On 30/07/13 19:54, gvim wrote:
> > Can anyone explain why this works:
> >
> > my $ref = {a => 1, b => 2, c => 3};
> > say $ref->{b}; # Result: 2
> >
> > ... but this doesn't :
> >
> > my ($str, $ref) = 'text', {a => 1, b => 2, c => 3};
> > say $ref->{b}; # Result: Use of uninitialized value
> >
> > Seems a little inconsistent.
> >
> > gvim
> >
> >
>
> Try
>
> my ($str, $ref) = ( 'text', {a => 1, b => 2, c => 3} );
>
> The extra set of brackets force evaluation in a list context
List context is caused (indirectly) by the parens on the LHS of the
assignment. The added parens on the RHS do diddly squat for context.
They're there for *precedence*. Their act is played at parse time,
and they don't come back for an encore at compile time, nor run time.
Abigail
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