Re[2]: unpack() behaviour not as documented

[Bulat Ziganshin <bulat.ziganshin@...>]

Hello Duncan,

Thursday, June 11, 2009, 1:02:57 AM, you wrote:

> if you want to iterate over the varargs of a function, when some of them
> may be nil, you have to use:

> for i = 1,select('#', ...) do
>   local k = select(i, ...)
>   -- (stuff)
> end

> instead of:

> for i,k in ipairs{...} do
>   -- (stuff)
> end

> ...as ipairs will stop on the first nil.


afai now realized, it's neither guaranteed with #:

> The length of a table t is defined to be any integer index n such that
> t[n] is not nil and t[n+1] is nil; moreover, if t[1] is nil, n can be
> zero. For a regular array, with non-nil values from 1 to a given n,
> its length is exactly that n, the index of its last value. If the
> array has "holes" (that is, nil values between other non-nil values),
> then #t can be any of the indices that directly precedes a nil value
> (that is, it may consider any such nil value as the end of the array).


although your code works with 5.1.4 in my program, it may break. so i
still looking for the proper way to iterate in order over all array
elements. it looks like i should make list of table indexes and then sort
them - fortunately, my array is very short

-- 
Best regards,
 Bulat                            mailto:Bulat.Ziganshin@gmail.com