Perl 6 is slated to include a new list manipulation function, part (for partition, although Damian likes it 'cause it can mean so many other things). It takes a codeblock and a list; the codeblock returns an index, and part puts it into an arrayref corresponding to that index. For example: 
my($good, $bad, $ugly)=part {
    /good/ ? 0 :
    /bad/  ? 1 :
    /ugly/ ? 2 :
    (warn "$_ didn't categorize" and 3)
} @people;

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If you replace the $good, $bad, and $ugly with *good, *bad, and *ugly in that example, you'll get the arrays in @good, @bad and @ugly.
sub part(&@) {
    my($code, @list)=@_;
    my @ret=();
    push @{$ret[&$code()]}, $_ for @list;
    return @ret;
}

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In reply to Perl 6's part() by BrentDax

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