[S29] update (was: Re: Question about $pair.kv)

[Ingo Blechschmidt]

Hi, 
 
Luke Palmer  luqui.org> writes: 
> Stevan Little writes: 
> > One tests shows $pair.kv returning an array with two elements (the key  
> > and value of the pair). (This is also how Pugs currently implements  
> > this.) 
>  
> The former is certainly correct.  When all else fails, consider a pair 
> to be a one-element hash. 
 
then the S29 draft (http://www.rodadams.net/Perl/S29.html) needs 
updating, as currently it states: 
> What is returned at each element of the iteration varies 
> with function. values returns the value of the associated 
> element; **kv returns a 2 element list in (index, value) 
> order**, pairs a Pair(index, value). 
 
Unless, of course, I misunderstand any(S29, Luke) :) -- 
Is the following correct? 
  my @array = ; 
  my @kv= @array.kv; 
  say [EMAIL PROTECTED];  # 6 
  say [EMAIL PROTECTED];  # 0 a 1 b 2 c 
 
FYI, before your post, my assumption was: 
  my @array = ; 
  my @kv= @array.kv; 
  say [EMAIL PROTECTED];  # 3 
  say [EMAIL PROTECTED];   # 0 a 
  say [EMAIL PROTECTED];   # 1 b 
  say [EMAIL PROTECTED];   # 2 c 
  # That means, @kv = ([0, a], [1, b], [2, c]) 
 
 
--Ingo 
 
--  
Linux, the choice of a GNU | Life would be so much easier if we could 
generation on a dual AMD   | just look at the source code. 
Athlon!| -- Dave Olson   

Re: Question about $pair.kv

[Luke Palmer]

Stevan Little writes:
> One tests shows $pair.kv returning an array with two elements (the key 
> and value of the pair). (This is also how Pugs currently implements 
> this.)
> 
> Another test shows $pair.kv returning an array with one element which 
> is an array-ref/list which itself has 2 elements (the key and value) in 
> it.
> 
> I tend to think the former is correct, however a comment over the later 
> one indicated that it was stated to be this way on this list. I looked 
> though the list, but was unable to find the specific reference.

The former is certainly correct.  When all else fails, consider a pair
to be a one-element hash.

Luke

Re: Question about $pair.kv

[Ovid]

--- Stevan Little <[EMAIL PROTECTED]> wrote:
> Autrijus asked me to look into the correct behavior for $pair.kv 
> One tests shows $pair.kv returning an array with two elements (the
> key 
> and value of the pair). (This is also how Pugs currently implements 
> this.)
> 
> Another test shows $pair.kv returning an array with one element which
> 
> is an array-ref/list which itself has 2 elements (the key and value)
> in  it.

Page 52 of the 2nd Edition Perl6 and Parrot has this:

  for %ages.kv -> $name, $age {
print "$name is now $age";
  }

That tends to suggest the former interpretation is correct.

Cheers,
Ovid

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