Re: RFC 90 (v1) Builtins: zip() and unzip()

[Philip Newton]

On 11 Aug 2000, Perl6 RFC Librarian wrote:

> its arguments. C<unzip($list_size, \@list)> would reverse this operation.

[...]

> In order to reverse this operation we need an C<unzip> function:
> 
>   @zipped_list = zip(\@a,\@b);   # (1,2,3,4,5,6)
>   @unzipped_list = unzip(3, \@zipped_list);   # ([1,3,5], [2,4,6])

Would it not be more natural to pass the *number* of lists to unzip,
rather than the desired length? This way, unzip() would know to pick off
elements two-at-a-time, three-at-a-time, etc., rather than having to go
through the zipped list, count the elements, divide by $list_size, etc.

Unless I misunderstood the example and you wanted the result to be
([1,2,3], [4,5,6]) in which case unzip would not have to do nearly as much
work. But then (1..7) would unzip(3) into ([1,2,3], [4,5,6], [7]).

Cheers,
Philip
-- 
Philip Newton <[EMAIL PROTECTED]>