... filter out undefined values ... [emphasis added]
My take is that keys with undefined values (either because non-existent or undef) are to be filtered out. One way:
c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my %args = ('profile' => 'foo', 'xyzzy' => undef, 'status' => 0);
my %ta =
map { defined $args{$_} ? ($_ => $args{$_}) : () }
qw(profile password xyzzy status)
;
dd 'filtered', \%ta;
dd 'original', \%args;
"
("filtered", { profile => "foo", status => 0 })
("original", { profile => "foo", status => 0, xyzzy => undef })
Give a man a fish: <%-{-{-{-<
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