How about precaching a hash called %biasbase like this?
my $sum = 0;
$biasbase{$_} = ($sum += $bias{$_}) foreach (reverse keys %bias);
And then iterate like this:
while( my($k,$v) = each %bias and not defined $rand){
$rand = $k if rand($biasbase{$k}) < $v;
}
Does that make sense? That way you can bail out early.
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