On Wednesday 01 May 2002 1:43 pm, fliptop wrote:
> Andrew Rosolino wrote:
> > Say I have an array that contains!
> >
> > @array = qw( cool cool dog dog dog );
> >
> > Now I want to sum that up, so that the array only has
> > 1 COOL and 1 DOG, so it would contain!
> >
> > @array = qw( cool dog );
>
> my %array;
>
> map { $array{$_}++ } @array;
What's the difference between the above, and the below, and why is one better
than the other?
{$array{$_}++} foreach @array;
>
> my @unique = keys %array;
>
> there are several examples in the perl cookbook that demonstrate other
> methods for finding unions, intersections, etc.
--
Gary Stainburn
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