On Tue, Jul 6, 2021 at 10:42 AM ToddAndMargo via perl6-users
<perl6-us...@perl.org <mailto:perl6-us...@perl.org>> wrote:
>> On Tue, Jul 6, 2021 at 9:39 AM ToddAndMargo via perl6-users
>> I am confused.
>>
>> What I am after it pre-salting $CC.I with
>> $CC.[0] = "abc"
>> $CC.[1] = "def"
>>
>> with the ".new" functions when I create $CC
>>
>> -T
On 7/6/21 12:52 AM, Fernando Santagata wrote:
> Hello,
>
> I think that that was exactly what Norman was trying to show.
Probably
> you've been mislead by the first value they assigned in their
example:
>
> my $CC = AA.new( I => [Str,"abc"] );
>
>
> Here the 'Str' is the "empty" or "undefined" value, since the
array was
> declared as a Str array.
>
> Try this:
>
> > class AA { has Str @.I is rw }
> (AA)
> > my $aa = AA.new: I => ['a','b']
> AA.new(I => Array[Str].new("a", "b"))
> > say $aa.I[0]
> a
> > say $aa.I[1]
> b
>
> or this
>
> > my $bb = AA.new: I => 'a'
> AA.new(I => Array[Str].new("a"))
> > $bb.I[0]
> a
>
Hi Fernando,
Thank you! Now I understand the syntax better.
$ p6 'class AA { has Str @.I is rw; };
my $CC = AA.new( I => ["abc","def"] );
say $CC.I[1];'
def
Follow up question. Since Raku allows me to assign
elements to an array in non sequential order:
$ p6 'my @x; @x[4]=44; say @x;'
[(Any) (Any) (Any) (Any) 44]
How to I modify
my $CC = AA.new( I => ["abc","def"] );
such that I can place values in non sequential order?
For example, I wanted to pre-salt
$CC.I[4] = "four"
$CC.I[2] = "two"
Many thanks,
-T
On 7/6/21 2:06 AM, Fernando Santagata wrote:
Hi,
for your last question, let's use again what Norman showed you earlier:
> class AA { has Str @.I is rw }
(AA)
> my $CC = AA.new(I => [Str, Str, 'two', Str, 'four'])
AA.new(I => Array[Str].new(Str, Str, "two", Str, "four"))
> say $CC.I[0]
(Str)
> say $CC.I[2]
two
> say $CC.I[4]
four
In this case undefined values are initialized by their own base class.
Since @.I was declared as a Str array, then Norman used the base class
'Str' as initialization value.
Now I understand. You are using Str as a
skip, skip, drop 2, skip, drop 4
This is a sequential workaround.
Also I was confused as I though Str was only
a type declaration and could be used this way.
What I would like to see is direct access, without the
skips.
In other words, the pre-salt equivalent of
class AA { has Str @.I is rw };
my $CC = AA.new;
$CC.I[400] = "four hundred"
$CC.I[2000] = "two thousand"
writing out 2000 skips is not practical.
-T
