In article <[EMAIL PROTECTED]>,
[EMAIL PROTECTED] (Michael Kavanagh) writes:
>Hi there,
>
>I've got a hash that has keys which contain either
>- array references
>- scalar values
>
>for example:
>@values = (12398712984, 19286192879);
>$hashofarrays{'family'}{'arrayref'} = \@values;
>$hashofarrays{'family'}{'scalar'} = 12938712938;
Well, it's not the keys that contain that, it's the values...
>I'm trying to map the hash into another array that would just be a flattened
>list of values. (a combination of the scalar values and the individual array
>values)
>I'm iterating through each key in the hash and then using 'map' on the key
>to do this at the moment.
>
>I can get it to work for all the array references by mapping on the
>de-referenced array ref, like this:
> map { push @items, $_ } ( @{$hashofarrays{'family'}{'arrayref'} }
>);
That doesn't look like code that's iterating through the keys. You have a
single hardcoded key.
>But that ignores all the scalar values...it only gets the keys that contain
>array references.
>
>To get the scalars, the following works:
> map { push @items, $_ } ( $hashofarrays{'family'}{'scalar'} );
There's only one scalar there and hence the map is superfluous.
>Is there an elegant / idiomatic way to do both at once?
>I'm guess I could do it using a conditional that checks the hash value and
>executes one of the above statements as I iterate through the hash keys, but
>if theres a better way...
@combined = map { @{$_->{arrayref}||[]}, exists $_->{scalar} ? $_->{scalar} : () }
values %hashofarrays;
--
Peter Scott
http://www.perldebugged.com
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