Well, you could go with
use constant PADDING => 2;
my $col_width = PADDING + (
sort {
$b <=> $a
} map {
length
} keys %list, map {
@$_
} values %lists
)[ 0 ]; ## Longest key or value
But in use constant PADDING => 2;
my $col_width = PADDING + (
sort {
$b <=> $a
} map {
length
} map {
ref ? @$_ : $_
} %lists
)[ 0 ]; ## Longest key or value
The line ref eq 'ARRAY' ? @$_ : $_ just says: if it($_) is a value (array) flatten it to a list, (which you already had in your own version), or if it is a key, pass it through untouched.
That avoids having to treat the keys and values separately, (and iterate the hash twice to generate them). In doing so it reduces the noise level a little further.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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