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  1. or download this
    use strict;
use warnings;
...
print "Not empty: scalar\n" if scalar %hash;
print "Not empty: 0 != scalar\n" if 0 != scalar %hash;
print "Not empty: keys\n" if keys %hash;
  2. or download this
    v5.32.1
Empty: !%hash
...
Not empty: scalar
Not empty: 0 != scalar
Not empty: keys