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I msg'd you, but you weren't around, so I'll post here.

The benchmark isn't benchmarking the giant hash - the parameter being passed to the sub is not what you think it is (which explains the amazing speed)! Just use %h directly in the sub to see the difference.

Try using this modified sub by_for to show how the parameters are being passed:

sub by_for { my $h = shift; die scalar keys %$h unless scalar keys %$h; my @def; $def[ defined $_ ? 1 : 0]++ for values %$h; @def; }

It dies when the benchmark is run.

In reply to Re: Re:x2 Counting keys with defined or undefined elements in a hash by jsprat
in thread Counting keys with defined or undefined elements in a hash by Bukowski

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