Trina Espinoza wrote:
> I have a hash that contains keys, but does not yet have
> values.
Well, that's not technically possible. Each key is associated with a single
scalar value. The only way to create a key is to assign a value.
> How do you push a list of an item into the value for a
> particular key?
>
> I tried doing this example below, but it does not seem to be
> working. Is there anything wrong with the way this is written? Can
> someone give me suggestions for trouble shooting if this looks fine?
>
>
> Thanks!
>
> -T
> ----------------------------------------------------------
> unless (exists $shots_OTIS{$shot}) {
> #print "putting shot in array";
> $shots_OTIS{$shot} = "";
This is the problem. You initialize the value to "" (a simple scalar), and
then try to use that as a reference later. You need to initialize the value
to a reference to an empty array:
$shots_OTIS{$shot} = [];
The brackets create an anonymous (empty) array and return a reference to it.
> }
> push( @{$shots_OTIS{$shot}}, $endShot); ###TRIED THIS. DID NO WORK
>
>
> }
But, you don't need to do this at all. Perl has something called
"autovivification", which means that when you say:
push @{$shots_OTIS{$shot}}, $endShot;
The reference $shots_OTIS{$shot} is automatically created if it doesn't
exist. So you can bypass all the exists() checking and just use the push by
itself.
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