If you're going for speed, then don't make a needless copy of everything in @required. 

my %required;
@required{@required}=();
delete @required{@got};

warn "Skipper is missing: ", keys %required;

[download]

Of course, this assumes string values.

In reply to Re^2: map question (hash slice) by ikegami
in thread map question by catfish1116

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