Don't use the most modern syntax if you want backwards compatibility, but if you do use it, you have to understand what its doing, https://metacpan.org/pod/distribution/perl/pod/perldata.pod#Key-Value-Hash-Slices

So 

yada( $key , $hash{$key} );
daya( map { $_ => $hash{$_} } qw/ key1 key 2 / );

[download]

It looks like this:

If you're posting code, might as well post the hash declaration ... Data::Dump:dd(\%hash) output

In reply to Re: Hash of hashes and subroutine by Anonymous Monk
in thread Hash of hashes and subroutine by piou20100

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