Re: How do a pe-salt an array inside an object?
@ToddandMargo wrote:
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"
> $CC.I[2000] = "two thousand"
> writing out 2000 skips is not practical.
I definitely agree with you, so let's use what we know of Raku to our
advantage. A hash structure would work well, here with the
Array-Indexes-to-Use as keys:
class AA {
has @.I;
submethod BUILD (:$data) {
@!I[.key] = .value for $data[]
}
method new (*@data) {
self.bless( data => @data )
}
}
You can now do the following:
AA.new(2 => 'b', 4 => 66, 9 => 'apples')
Which makes for a nice initializer!
- X
Re: How do a pe-salt an array inside an object?
On 7/6/21 1:23 PM, Bruce Gray wrote: On Jul 6, 2021, at 3:10 PM, Tom Browder wrote: On Tue, Jul 6, 2021 at 14:53 ToddAndMargo via perl6-users wrote: ... writing out 2000 skips is not practical. Todd, why don't you tell us what you're really trying to do, i.e., what is your use case? Maybe the experts can suggest a better class design. -Tom I also would prefer seeing a use case. In the meantime: my @will_become_I_soon; @will_become_I_soon[400] = "four hundred"; @will_become_I_soon[2000] = "two thousand"; my $CC = AA.new( I => @will_become_I_soon ); Hmmm. 1002 ways! or my $CC = AA.new( I => [ flat( Str xx 400, "four hundred", Str xx 2000-400-1, "two thousand" ) ] ); Sweet! Thank you! No use case. I am just in learning mode on the different ways to pre-salt an object on creation.
Re: How do a pe-salt an array inside an object?
On 7/6/21 1:10 PM, Tom Browder wrote: On Tue, Jul 6, 2021 at 14:53 ToddAndMargo via perl6-users mailto:perl6-users@perl.org>> wrote: ... writing out 2000 skips is not practical. Todd, why don't you tell us what you're really trying to do, i.e., what is your use case? Maybe the experts can suggest a better class design. -Tom Hi Tom, I am only trying to write down the various ways to pre-salting an object on creation. In practice, if I can not figure out how to pre-salt in the declaration, I just put what I want into what I want right under the object declaration. Raku is like super glue: 1001 ways to do everything. I am just in learning mode here. I adore hashes, but have found myself switching over to custom classes wherever I use to use hashes. Custom classes are a ton more versatile and I don't have to constantly look up their syntax -T
Re: How do a pe-salt an array inside an object?
> On Jul 6, 2021, at 3:10 PM, Tom Browder wrote: > > On Tue, Jul 6, 2021 at 14:53 ToddAndMargo via perl6-users > wrote: > ... > writing out 2000 skips is not practical. > > Todd, why don't you tell us what you're really trying to do, i.e., what is > your use case? Maybe the experts can suggest a better class design. > > -Tom I also would prefer seeing a use case. In the meantime: my @will_become_I_soon; @will_become_I_soon[400] = "four hundred"; @will_become_I_soon[2000] = "two thousand"; my $CC = AA.new( I => @will_become_I_soon ); or my $CC = AA.new( I => [ flat( Str xx 400, "four hundred", Str xx 2000-400-1, "two thousand" ) ] ); -- Hope this helps, Bruce Gray (Util of PerlMonks)
Re: How do a pe-salt an array inside an object?
On Tue, Jul 6, 2021 at 14:53 ToddAndMargo via perl6-users < perl6-users@perl.org> wrote: ... > writing out 2000 skips is not practical. Todd, why don't you tell us what you're really trying to do, i.e., what is your use case? Maybe the experts can suggest a better class design. -Tom
Re: How do a pe-salt an array inside an object?
On Tue, Jul 6, 2021 at 10:42 AM ToddAndMargo via perl6-users
mailto:perl6-users@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
Re: How do a pe-salt an array inside an object?
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.
On Tue, Jul 6, 2021 at 10:42 AM ToddAndMargo via perl6-users <
perl6-users@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
>
>
>
>
>
--
Fernando Santagata
Re: How do a pe-salt an array inside an object?
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
Re: How do a pe-salt an array inside an object?
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
On Tue, Jul 6, 2021 at 9:39 AM ToddAndMargo via perl6-users <
perl6-users@perl.org> wrote:
> >> On Tue, 6 Jul 2021 at 10:55, ToddAndMargo via perl6-users
> >> mailto:perl6-users@perl.org>> wrote:
> >>
> >> Hi All,
> >>
> >> On creation, I would like to salt some of the
> >> values inside an object when the variable
> >> inside is an array:
> >>
> >>
> >> First a concept test:
> >> $ p6 'class AA { has Str @.I is rw; }; my $CC= AA.new; $CC.I[1] =
> >> "def";
> >> say $CC.I[1];'
> >>
> >> def
> >>
> >>
> >> Now for the pre-salt test
> >> $ p6 'class AA { has Str @.I is rw; }; my $CC = AA.new( I[1] =>
> >> "abc" );
> >> say $CC.I[1];'
> >>
> >> ===SORRY!=== Error while compiling -e
> >> Undeclared name:
> >> I used at line 1
> >>
> >>
> >> What am I doing wrong?
> >>
> >> Many thanks,
> >> -T
>
> On 7/5/21 10:45 PM, Norman Gaywood wrote:
> > $ raku
> > Welcome to 퐑퐚퐤퐮퐝퐨™ v2021.06.
> > Implementing the 퐑퐚퐤퐮™ programming language v6.d.
> > Built on MoarVM version 2021.06.
> >
> > To exit type 'exit' or '^D'
> > > class AA { has Str @.I is rw; };
> > (AA)
> > > my $CC = AA.new( I => [Str,"abc"] );
> > AA.new(I => Array[Str].new(Str, "abc"))
> > > say $CC.I;
> > [(Str) abc]
> > > say $CC.I[1];
> > abc
> > > $CC.I[0] = "zyz";
> > zyz
> > > say $CC.I;
> > [zyz abc]
> > >
> >
>
> Hi Norman,
>
> 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
>
>
--
Fernando Santagata
Re: How do a pe-salt an array inside an object?
On Tue, 6 Jul 2021 at 10:55, ToddAndMargo via perl6-users
mailto:perl6-users@perl.org>> wrote:
Hi All,
On creation, I would like to salt some of the
values inside an object when the variable
inside is an array:
First a concept test:
$ p6 'class AA { has Str @.I is rw; }; my $CC= AA.new; $CC.I[1] =
"def";
say $CC.I[1];'
def
Now for the pre-salt test
$ p6 'class AA { has Str @.I is rw; }; my $CC = AA.new( I[1] =>
"abc" );
say $CC.I[1];'
===SORRY!=== Error while compiling -e
Undeclared name:
I used at line 1
What am I doing wrong?
Many thanks,
-T
On 7/5/21 10:45 PM, Norman Gaywood wrote:
$ raku
Welcome to 퐑퐚퐤퐮퐝퐨™ v2021.06.
Implementing the 퐑퐚퐤퐮™ programming language v6.d.
Built on MoarVM version 2021.06.
To exit type 'exit' or '^D'
> class AA { has Str @.I is rw; };
(AA)
> my $CC = AA.new( I => [Str,"abc"] );
AA.new(I => Array[Str].new(Str, "abc"))
> say $CC.I;
[(Str) abc]
> say $CC.I[1];
abc
> $CC.I[0] = "zyz";
zyz
> say $CC.I;
[zyz abc]
>
Hi Norman,
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
Re: How do a pe-salt an array inside an object?
$ raku
Welcome to 퐑퐚퐤퐮퐝퐨™ v2021.06.
Implementing the 퐑퐚퐤퐮™ programming language v6.d.
Built on MoarVM version 2021.06.
To exit type 'exit' or '^D'
> class AA { has Str @.I is rw; };
(AA)
> my $CC = AA.new( I => [Str,"abc"] );
AA.new(I => Array[Str].new(Str, "abc"))
> say $CC.I;
[(Str) abc]
> say $CC.I[1];
abc
> $CC.I[0] = "zyz";
zyz
> say $CC.I;
[zyz abc]
>
On Tue, 6 Jul 2021 at 10:55, ToddAndMargo via perl6-users <
perl6-users@perl.org> wrote:
> Hi All,
>
> On creation, I would like to salt some of the
> values inside an object when the variable
> inside is an array:
>
>
> First a concept test:
> $ p6 'class AA { has Str @.I is rw; }; my $CC= AA.new; $CC.I[1] = "def";
> say $CC.I[1];'
>
> def
>
>
> Now for the pre-salt test
> $ p6 'class AA { has Str @.I is rw; }; my $CC = AA.new( I[1] => "abc" );
> say $CC.I[1];'
>
> ===SORRY!=== Error while compiling -e
> Undeclared name:
> I used at line 1
>
>
> What am I doing wrong?
>
> Many thanks,
> -T
>
> --
>
> If I had a dime every time I didn't know
> what was going on, I'd be like, "Why is
> everyone giving me all these dimes?"
>
>
--
Norman Gaywood, Computer Systems Officer
School of Science and Technology
University of New England
Armidale NSW 2351, Australia
ngayw...@une.edu.au http://turing.une.edu.au/~ngaywood
Phone: +61 (0)2 6773 2412 Mobile: +61 (0)4 7862 0062
Please avoid sending me Word or Power Point attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html
How do a pe-salt an array inside an object?
Hi All,
On creation, I would like to salt some of the
values inside an object when the variable
inside is an array:
First a concept test:
$ p6 'class AA { has Str @.I is rw; }; my $CC= AA.new; $CC.I[1] = "def";
say $CC.I[1];'
def
Now for the pre-salt test
$ p6 'class AA { has Str @.I is rw; }; my $CC = AA.new( I[1] => "abc" );
say $CC.I[1];'
===SORRY!=== Error while compiling -e
Undeclared name:
I used at line 1
What am I doing wrong?
Many thanks,
-T
--
If I had a dime every time I didn't know
what was going on, I'd be like, "Why is
everyone giving me all these dimes?"
