See Dereferencing Syntax and/or References Quick Reference.

Where you would do %hash, you do %{$hashref} (curlies optional) like did for keys. Similarly,
where you would do $hash{$key}, you do ${$hashref}{$key} (curlies optional) or $hashref->{$key}.

In reply to Re: Printing hash references for Image::EXIF by ikegami
in thread Printing hash references for Image::EXIF by Anonymous Monk

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