⭐ in reply to How can I assign the elements in an array to only the key values in a hash?

Least confusing and most idiomatic is 
@hash{@keys} = ();

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Unlike arturo's code, it writes a list where it means to write a list. See MeowChow's comments; here all values get set to undef "implicitly".
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In Section Seekers of Perl Wisdom