St?phane Payrard skribis 2004-05-18 23:14 (+0200):
> I use over and over this idiom in perl5:
> $a{$_}++ for @a;
> This is nice and perlish but it gets easily pretty boring
> when dealing with many list/arrays and counting hashes.
A3 says something about tr being able to return a histogram (a hash like
your %a), A5 says something about tr being able to match more than just
characters.
There must be some neat trick with tr that you can use for this :)
But maybe it's better to just define a histogram method for arrays. Then
you can get the unique elements by doing @array.histogram.keys. But
again, just having a method for that is probably a better idea (if only
because with the hash, the original order is lost).
Juerd
