Quick, but quickly wrong.

It is easy for two hashes to be the same but have different scalar sizes. For instance: 

my %foo = 0..1000;
delete $foo{2*$_} for 1..500;
print scalar %foo; # prints "1/512"

my %bar = (0, 1);
print scalar %bar; # prints "1/8"

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but in fact %foo and %bar have the same exact key/value pairs.

Furthermore as I just pointed out in Re: Redirecting STDOUT from internal function with 5.6.1 restrictions, prototypes in Perl generally don't do what you'd want them to do, and you are far better off not using them.

UPDATE Big oops. I don't know why I thought I read scalar where it said keys. The prototype comment still stands though.

In reply to Re^2: Multiple loop variable in foreach statement by tilly
in thread Multiple loop variable in foreach statement by tc1364

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