Hi,
On 09/25/2015 05:46 PM, mt1957 wrote:
Found the following using Array;
> my Array $a;
> say $a.elems;
1
> $a.push(1)
[1]
> say $a.perl
[1]
> say $a.elems
1
> my Array $a .= new;
[]
> say $a.elems;
0
Seems that an uninitialized Array reports one element but pushing values
on the array will define the properly. In this case it is important to
initialize.
I know that this can be surprising, but it's actually quite sensible.
If you iterate over the Array type object, you get one iteration:
for Array { .say }
so it makes sense that Array.elems returns 1.
if .push wouldn't autovivify a defined array, thinks like
my %h;
%h<key>.push: $new_value;
couldn't work.
But the real advise is it use @-sigiled variables when dealing with
arrays; they don't exhibit such interesting corner cases.
Cheers,
Moritz
