Re: [PATCH 5.005_63] Open-ended slices: (a..z)[23..]

[scozens@pwj.co.jp]

gsar@activestate.com wrote:
> Interesting idea, but I think I'd want it to be more general than
> what you've got there.

I had a feeling someone was going to say that. :)

>    print @a[3..];      # fourth item to the last

We can do this, but for lists.

>    print @a[-2..];          # last three items

We can do this, but for lists. I looked into doing the two
above for arrays, but I got scared.

>    print @a[1..-2];         # second through third-last

I had something like this working before, but MJD pointed out
x..y where x>y already has a meaning - it's defined in perlop
to return an empty list. At least a completely new syntax
doesn't break stuff. If you like, I'll play with it, though.

>    print @a[..-2];          # first through third-last

Breaking intuition with $a[-1] being the final element
because...?

>    print @a[..];       # everything (useless?)

@a[$x..$y] - who's to say that $x and $y can't be undef oh
my gosh.

>    print (1,2,3)[1..-2];    # empty-list/error/reverse(1,2) ???

Uhm. I'd say empty list. Interesting.

Simon

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Follow-Ups from:

Gurusamy Sarathy <gsar@ActiveState.com>

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