Re: Hash of arrays generation

The former will make $HoA{$key} an array ref regardless of what it was before.

The latter will cause problems if $HoA{$key} was something other than an arrayref.

use strict;
use warnings;
my %HoA;
$HoA{'bar'} = 'baz';
@{$HoA{'foo'}} = (1,2,3);
@{$HoA{'bar'}} = (1,2,3);
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Gives: Can't use string ("baz") as an ARRAY ref while "strict refs" in use at test.pl line 6.

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Re^2: Hash of arrays generation by nemesisgus (Acolyte) on Sep 05, 2012 at 00:31 UTC
Thank you both for answering. I didn't consider the case of an already defined key element. Thanks for pointing it out!	[reply]