On Thu, Dec 22, 2005 at 04:47:21PM +0100, Michele Dondi wrote: > This is not a substantial issue regarding Perl 6, but is more a minor > feature curiosity/meditation. It was inspired some time ago by this PM > node: > > http://perlmonks.org/?node_id=509310 > > I was wondering if in addition to push(), pop() etc. there could be be > rot() and roll() methods that would act upon lists (not modifying them) > like thus: > > (qw/aa bb cc dd ee/).rot(2) # qw/cc dd ee aa bb/ > (qw/aa bb cc dd ee/).rot() # qw/bb cc dd ee aa/ => same as .rot(1) > (qw/aa bb cc dd ee/).roll(2) # qw/dd ee aa bb cc/ => same as .rot(-2) > (qw/aa bb cc dd ee/).roll() # qw/ee aa bb cc dd/ => same as .roll(1)
"rot" doesn't conjur the right stuff for me, sorry. Since we already have shifting operators, why not just (re)use them? If +< is "numeric" left shift, maybe @< is "array" left shift. Of course, then you'd have to figure how to vary the wrapping semantics. my @a = qw/aa bb cc dd ee/; @a = @a @< 2; # or @a @<= 2; my @b = @a @> 4; Okay, I'm already not liking that syntax, but the idea is the same: we have "shifting" ops, let capitalize on that meme. > ... > etc. > > Also I wonder if one will be able to push(), pop(), etc. array slices as > well whole arrays. A' la > > my @a=qw/aa bb cc dd ee/; > my $s=pop @a[0..2]; # or [0,2] or just [0] for that matters! > # $s='cc'; > # @a=qw/aa bb dd ee/; => same as what I can do with slice() > > Not terribly necessary, but indeed consistent IMHO. Not quite sure why you'd want this, but if we have something like this: my @a = qw/aa bb cc dd ee/; my @slice := @a[0..2]; my $s = pop @slice; (where @slice is a "reference" to part of @a) You get what you want and more. -Scott -- Jonathan Scott Duff [EMAIL PROTECTED]
