> should be 7

Really? Like this?

#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

my $hash = { 'key' => 'value' };

my %chars;
$chars{$_} ++ for split //, join "", %$hash;
my $count = keys %chars;
say $count;

[download]
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Get total number of characters in a hash (not memory usage) by choroba
in thread Get total number of characters in a hash (not memory usage) by TieUpYourCamel

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