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  1. or download this
    $ perl -Mstrict -Mwarnings -E '
my %weekly_hash;
...
say scalar @{ $weekly_hash{$i} };
'
6
  2. or download this
    $ perl -Mstrict -Mwarnings -E '
my %weekly_hash;
...
say scalar @{ $weekly_hash{$i} };
'
7
  3. or download this
    $ perl -Mstrict -Mwarnings -E '
my %weekly_hash;
...
say scalar @{[ grep { defined } @{ $weekly_hash{$i} } ]};
'
6