How to clear a Perl hash

Let's say we define an anonymous hash like this:

my $hash = {};

And then use the hash afterwards. Then it's time to empty or clear the hash for reuse. After some Google searching, I found:

%{$hash} = ()

and:

undef %{$hash}

Both will serve my needs. What's the difference between the two? Are they both identical ways to empty a hash?

How do I undef a hash in Perl?

undef on hash elements The script uses $h{Foo} = undef; to set the value of a hash key to be undef. use strict; use warnings; use Data::Dumper qw(Dumper);

How do I delete a scalar in Perl?

Perl | delete() Function Delete() in Perl is used to delete the specified keys and their associated values from a hash, or the specified elements in the case of an array.

%$hash_ref = (); makes more sense than undef-ing the hash. Undef-ing the hash says that you're done with the hash. Assigning an empty list says you just want an empty hash.