Re: 2020.07 just hit
> $ raku --version > This is Rakudo version 2020.07 built on MoarVM version 2020.07 > implementing Raku 6.d. > Whats is new?? Release notes are at https://github.com/rakudo/rakudo/blob/master/docs/announce/2020.07.md I'm most excited for new the Unicode operators, ≡ and ≢ (though the permutations speedup is pretty cool too).
Re: Baby steps to create a dataframe structure
Then, a native call to R may be better cus bring us dataframe an a lot of statistical functions natively without other R's package. But the idea is to implement cooperatively those tools. On Tue, Jul 21, 2020 at 10:33 PM Tom Browder wrote: > On Tue, Jul 21, 2020 at 20:00 Warren Pang wrote: > >> I have the same feeling. Perl5 has PDL which we have been using for data >> analysis. While Raku seems to lack this. >> > > I haven't looked into how it might work, but Raku does have the NativeCall > interface as well as Inline::Perl5 which may help. > > I have had a lot of success with using CPAN's Perl modules with Raku > programs. > > Best regards, > > -Tom > > -- Aureliano Guedes skype: aureliano.guedes contato: (11) 94292-6110 whatsapp +5511942926110
Re: Baby steps to create a dataframe structure
On Tue, Jul 21, 2020 at 20:00 Warren Pang wrote: > I have the same feeling. Perl5 has PDL which we have been using for data > analysis. While Raku seems to lack this. > I haven't looked into how it might work, but Raku does have the NativeCall interface as well as Inline::Perl5 which may help. I have had a lot of success with using CPAN's Perl modules with Raku programs. Best regards, -Tom
Re: Baby steps to create a dataframe structure
I have the same feeling. Perl5 has PDL which we have been using for data analysis. While Raku seems to lack this. Regards. On Wed, Jul 22, 2020 at 7:42 AM Aureliano Guedes wrote: > Hi all, > > I'd like to learn Raku deep enough to build a data structure. I have > experience with Perl5, Python, R, and even C/C++, then I get boring > feelings to learn something new from the beginning. Also, I prefer learning > a new language by applying f to something. > > Since I work with data analysis and data science, I'd like to try to > develop a data structure to dataframe in pure Raku. And if I do a basic but > useful thing capable to load a field delimited file (as CSV or TSV) into a > dataframe, I'll transform in a package and upload it to GitHub to > comparatively enhance the package. > What I need is suggestions for how do I start it. > - How I define a data structure: an array of arrays? > - Given the raku itself (and maybe some already existing packages) what > the structures and functions I may use. > > I got these ideas to start: > > The dataframe should support columns name to be called as: > > df.column1 > > and it should return a list of values on this column. > Also, when it read the delim file it should check each column type. > > > All suggestions are welcome. > > > > -- > Aureliano Guedes > skype: aureliano.guedes > contato: (11) 94292-6110 > whatsapp +5511942926110 >
Re: I cannot install any lib with Zef
Hello Aureliano, What happens if you try either of the lines below (without the quotes or version number): $ zef install Digest::SHA256::Native $ zef upgrade Digest::SHA256::Native Additionally, we may need some more information from you--specifically which operating system you're on. I recently solved a Mac-specific issue with LibCurl thanks to a timely update from Curt Tilmes. If you're interested, the LibCurl issue is below, and also I've included a link to a long discussion/issue below from the zef Github repo on how zef finds native libraries, see: https://github.com/CurtTilmes/raku-libcurl/issues/16 https://github.com/ugexe/zef/issues/356 Other than that, you may need to open an issue with the Digest::SHA256::Native module's author, at the Github repo below: https://github.com/bduggan/p6-digest-sha256-native HTH, Bill. On Mon, Jul 20, 2020 at 11:15 AM Aureliano Guedes wrote: > > Thanks, I checked it out. > now it is working > > But now I'm getting issues to install zef install Jupyter::Kernel, the issue > itself is on Digest::SHA256::Native:ver<0.03> installation. > > $ zef install "Digest::SHA256::Native:ver<0.03>" --force-build --force-test >> >> ===> Searching for: Digest::SHA256::Native:ver<0.03> >> ===> Building: Digest::SHA256::Native:ver<0.03> >> [Digest::SHA256::Native] /usr/bin/ld: cannot find -lffi >> [Digest::SHA256::Native] /usr/bin/ld: cannot find -ltommath >> [Digest::SHA256::Native] /usr/bin/ld: cannot find -latomic_ops >> [Digest::SHA256::Native] /usr/bin/ld: cannot find -luv >> [Digest::SHA256::Native] collect2: error: ld returned 1 exit status >> [Digest::SHA256::Native] make: *** >> [/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so] >> Error 1 >> [Digest::SHA256::Native] The spawned command 'make' exited unsuccessfully >> (exit code: 2) >> [Digest::SHA256::Native] in method build at >> /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/Build.pm >> line 14 >> [Digest::SHA256::Native] in block at -e line 1 >> ===> Building [FAIL]: Digest::SHA256::Native:ver<0.03> >> [Digest::SHA256::Native] Failed to build, but continuing with --force-build >> ===> Testing: Digest::SHA256::Native:ver<0.03> >> [Digest::SHA256::Native] Cannot locate native library >> '/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so': >> >> /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so: >> cannot open shared object file: No such file or directory >> [Digest::SHA256::Native] in method setup at >> /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 (NativeCall) >> line 290 >> [Digest::SHA256::Native] in method CALL-ME at >> /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 (NativeCall) >> line 577 >> [Digest::SHA256::Native] in sub sha256-hex at >> /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/lib/Digest/SHA256/Native.pm6 >> (Digest::SHA256::Native) line 19 >> [Digest::SHA256::Native] in sub sha256-hex at >> /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/lib/Digest/SHA256/Native.pm6 >> (Digest::SHA256::Native) line 9 >> [Digest::SHA256::Native] in block at t/01-basic.t line 6 >> [Digest::SHA256::Native] Cannot locate native library >> '/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so': >> >> /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so: >> cannot open shared object file: No such file or directory >> [Digest::SHA256::Native] in method setup at >> /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 (NativeCall) >> line 290 >> [Digest::SHA256::Native] in method CALL-ME at >> /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 (NativeCall) >> line 577 >> [Digest::SHA256::Native] in sub sha256-hex at >> /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/lib/Digest/SHA256/Native.pm6 >> (Digest::SHA256::Native) line 19 >> [Digest::SHA256::Native] in block at t/02-blob.t line 7 >> [Digest::SHA256::Native] Cannot locate native library >> '/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so': >> >> /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so: >> cannot open shared object file: No such file or directory >> [Digest::SHA256::Native] in method setup at >> /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 (NativeCall) >> line 290 >> [Digest::SHA256::Native] in method CALL-ME at >> /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 (NativeCall) >>
Baby steps to create a dataframe structure
Hi all, I'd like to learn Raku deep enough to build a data structure. I have experience with Perl5, Python, R, and even C/C++, then I get boring feelings to learn something new from the beginning. Also, I prefer learning a new language by applying f to something. Since I work with data analysis and data science, I'd like to try to develop a data structure to dataframe in pure Raku. And if I do a basic but useful thing capable to load a field delimited file (as CSV or TSV) into a dataframe, I'll transform in a package and upload it to GitHub to comparatively enhance the package. What I need is suggestions for how do I start it. - How I define a data structure: an array of arrays? - Given the raku itself (and maybe some already existing packages) what the structures and functions I may use. I got these ideas to start: The dataframe should support columns name to be called as: df.column1 and it should return a list of values on this column. Also, when it read the delim file it should check each column type. All suggestions are welcome. -- Aureliano Guedes skype: aureliano.guedes contato: (11) 94292-6110 whatsapp +5511942926110
Re: I cannot install any lib with Zef
I would assume the ffi, tommath, atomic_ops, and uv linker flags come straight from moarvm's linker flags, probably because the build script of Digest::SHA256::Native uses the flags used to compile moarvm itself. If you've compiled your moarvm yourself, this is a safe bet; these libraries are guaranteed to exist unless you've uninstalled them in the mean time. If you get the stuff from a package instead, that's not quite as sensible … On 20/07/2020 20:15, Aureliano Guedes wrote: > Thanks, I checked it out. > now it is working > > But now I'm getting issues to install zef install Jupyter::Kernel, > the issue itself is on Digest::SHA256::Native:ver<0.03> installation. > > $ zef install "Digest::SHA256::Native:ver<0.03>" --force-build > --force-test > > ===> Searching for: Digest::SHA256::Native:ver<0.03> > ===> Building: Digest::SHA256::Native:ver<0.03> > [Digest::SHA256::Native] /usr/bin/ld: cannot find -lffi > [Digest::SHA256::Native] /usr/bin/ld: cannot find -ltommath > [Digest::SHA256::Native] /usr/bin/ld: cannot find -latomic_ops > [Digest::SHA256::Native] /usr/bin/ld: cannot find -luv > [Digest::SHA256::Native] collect2: error: ld returned 1 exit status > [Digest::SHA256::Native] make: *** > > [/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so] > Error 1 > [Digest::SHA256::Native] The spawned command 'make' exited > unsuccessfully (exit code: 2) > [Digest::SHA256::Native] in method build at > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/Build.pm > line 14 > [Digest::SHA256::Native] in block at -e line 1 > ===> Building [FAIL]: Digest::SHA256::Native:ver<0.03> > [Digest::SHA256::Native] Failed to build, but continuing with > --force-build > ===> Testing: Digest::SHA256::Native:ver<0.03> > [Digest::SHA256::Native] Cannot locate native library > > '/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so': > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so: > cannot open shared object file: No such file or directory > [Digest::SHA256::Native] in method setup at > /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 > (NativeCall) line 290 > [Digest::SHA256::Native] in method CALL-ME at > /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 > (NativeCall) line 577 > [Digest::SHA256::Native] in sub sha256-hex at > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/lib/Digest/SHA256/Native.pm6 > (Digest::SHA256::Native) line 19 > [Digest::SHA256::Native] in sub sha256-hex at > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/lib/Digest/SHA256/Native.pm6 > (Digest::SHA256::Native) line 9 > [Digest::SHA256::Native] in block at t/01-basic.t line 6 > [Digest::SHA256::Native] Cannot locate native library > > '/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so': > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so: > cannot open shared object file: No such file or directory > [Digest::SHA256::Native] in method setup at > /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 > (NativeCall) line 290 > [Digest::SHA256::Native] in method CALL-ME at > /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 > (NativeCall) line 577 > [Digest::SHA256::Native] in sub sha256-hex at > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/lib/Digest/SHA256/Native.pm6 > (Digest::SHA256::Native) line 19 > [Digest::SHA256::Native] in block at t/02-blob.t line 7 > [Digest::SHA256::Native] Cannot locate native library > > '/home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so': > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/resources/libraries/libsha256.so: > cannot open shared object file: No such file or directory > [Digest::SHA256::Native] in method setup at > /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 > (NativeCall) line 290 > [Digest::SHA256::Native] in method CALL-ME at > /usr/lib/perl6/sources/24DD121B5B4774C04A7084827BFAD92199756E03 > (NativeCall) line 577 > [Digest::SHA256::Native] in sub sha256-hex at > > /home/acpguedes/.zef/store/Digest-SHA256-Native-0.03.tar.gz/Digest-SHA256-Native-0.03/lib/Digest/SHA256/Native.pm6 > (Digest::SHA256::Native) line 19 >
Re: 2020.07 just hit
$ raku --version This is Rakudo version 2020.07 built on MoarVM version 2020.07 implementing Raku 6.d. Whats is new?? On Tue, Jul 21, 2020 at 6:21 PM ToddAndMargo via perl6-users < perl6-users@perl.org> wrote: > GetRaku new update downloaded 2020.06 --> 2020.07 > -- Aureliano Guedes skype: aureliano.guedes contato: (11) 94292-6110 whatsapp +5511942926110
2020.07 just hit
GetRaku new update downloaded 2020.06 --> 2020.07
Re: BUILD and TWEAK
Oh, and the thing I forgot to mention: contrary to BUILD and TWEAK, DESTROY is
invoked by underlying backend VM. I.e. by MoarVM, or JVM, or JS because only
the VM knows when exactly an object cease to exists.
Best regards,
Vadim Belman
> On Jul 21, 2020, at 4:53 AM, Richard Hainsworth
> wrote:
>
> Trying to update the documentation on submethod TWEAK - there is nothing.
>
> But the documentation should be accurate and not confusing. So some questions:
>
> In a loop or program, things like BUILD or LEAVE or FIRST are called
> 'phasers'.
>
> By analogy, during the 'build' process of instantiating an object from a
> class, two 'submethod's can be called, viz.
>
> submethod BUILD and submethod TWEAK.
>
> 1) Should these submethods be considered 'phasers' to be consistent with
> other BUILD, LEAVE etc usages?
>
> 2) What actually calls these submethods?
>
> The documentation says 'bless' indirectly calls submethod BUILD. But the
> documentation seems to indicate that 'bless' is not needed to create an
> object.
>
> So what calls the submethods?
>
> 3) Is it correct to say that TWEAK can access all the attributes of the
> object?
>
> 4) How to describe the way the TWEAK of a subclass accesses attributes in the
> parent?
>
> eg
>
> class A { has $.thing }
>
> class B is A { submethod TWEAK { #do something to $.thing in A } }
>
Re: BUILD and TWEAK
> On Jul 21, 2020, at 4:53 AM, Richard Hainsworth > wrote: > > Trying to update the documentation on submethod TWEAK - there is nothing. > > But the documentation should be accurate and not confusing. So some questions: > > In a loop or program, things like BUILD or LEAVE or FIRST are called > 'phasers'. s/BUILD/BEGIN/ BUILD is a constructor. Same applies to TWEAK. Both are invoked at construction time but have different semantics. BUILD must take care of attribute initialization. If not installed, the core installs one for you. TWEAK is invoked at the last stage of construction is is able to tweak object state, as the name suggests. > > By analogy, during the 'build' process of instantiating an object from a > class, two 'submethod's can be called, viz. > > submethod BUILD and submethod TWEAK. > > 1) Should these submethods be considered 'phasers' to be consistent with > other BUILD, LEAVE etc usages? No. A phaser something responsible for a phase in code execution. BUILD, TWEAK, and DESTROY are responsible for object life cycle. BTW, there was once a discussion about a common name for all of them. But I don't remember if there was any consensus reached. In either case, 'constructors' and 'destructors' terms are commonplace. > > 2) What actually calls these submethods? With some level of simplification I can say that BUILD and TWEAK are invoked by method new. There is some indirection level though. > > The documentation says 'bless' indirectly calls submethod BUILD. But the > documentation seems to indicate that 'bless' is not needed to create an > object. 'bless' is kind of a simplified version of 'new'. You can find them in Rakudo src/core.c/Mu.pm. > > 3) Is it correct to say that TWEAK can access all the attributes of the > object? TWEAK can access all attributes of its class and public attributes of parent classes. BEGIN and TWEAK can't use `$.attribute` notation though, only `$!attribute` or `self.attribute`. > > 4) How to describe the way the TWEAK of a subclass accesses attributes in the > parent? It's done same way as accessing any parent method, as described above. Best regards, Vadim Belman
Re: Pod6 examples
Thanks, Richard and daniel. On 7/21/20, Richard Hainsworth wrote: > How about: > > https://github.com/Raku/doc/tree/master/doc/Language/pod.pod6 > > which is the pod source of https://docs.raku.org/language/pod > > Also try the other sources under the > https://github.com/Raku/doc/tree/master/doc directory. > > Richard > > On 21/07/2020 15:40, Parrot Raiser wrote: >> Can anyone point me at examples of pod6 in use? I'm trying to relate >> the syntax shown in https://docs.raku.org/language/pod to actual >> results. Concise would be nice, tutorial even better. >
Re: Pod6 examples
El mar., 21 jul. 2020 a las 17:23, Richard Hainsworth (< rnhainswo...@gmail.com>) escribió: > How about: > > https://github.com/Raku/doc/tree/master/doc/Language/pod.pod6 > > which is the pod source of https://docs.raku.org/language/pod This page is also intended as a tutorial. If there's something you miss there, we'd be happy to get an issue about it (or a PR). Cheers JJ
Re: Pod6 examples
> Can anyone point me at examples of pod6 in use?… Concise would be nice, One concise example I've found useful is the Pod::Load script, https://modules.raku.org/dist/Pod::Load:cpan:JMERELO/lib/Pod/Load.pm6 This short script shows pod6 used both as a more full-featured documentation format (the text between `=begin pod` and `=end pod`) and for inline "docstring"-like function documentation – which is then available at runtime via the `WHY` method – (the comments starting with `#|`. > tutorial even better. I'm not aware of any tutorials, but I wouldn't be surprised if some exist – there have been a lot of Raku blog posts over the years. Maybe someone else will know of one.
Re: Pod6 examples
How about: https://github.com/Raku/doc/tree/master/doc/Language/pod.pod6 which is the pod source of https://docs.raku.org/language/pod Also try the other sources under the https://github.com/Raku/doc/tree/master/doc directory. Richard On 21/07/2020 15:40, Parrot Raiser wrote: Can anyone point me at examples of pod6 in use? I'm trying to relate the syntax shown in https://docs.raku.org/language/pod to actual results. Concise would be nice, tutorial even better.
Pod6 examples
Can anyone point me at examples of pod6 in use? I'm trying to relate the syntax shown in https://docs.raku.org/language/pod to actual results. Concise would be nice, tutorial even better.
Re: subs and the type system
Given that the signature is going to be more complex, it would be
helpful if I do not need to repeat it for every member of the Walkable
class. I tried using a constant to represent the signature so that I can
create new Walkables without having to spell it out. Here is my code
attempt (not working)
use v6;
class WalkData {
has Str $.xyzzy;
}
constant \sgn-walkable = :(WalkData $d --> Any);
subset Walkable of Callable where { .signature ~~ sgn-walkable };
sub walk(Walkable $task) {
do-something($task, 17);
}
sub do-something(Walkable $task, Int $a) {
$task($a);
say $a;
}
my Walkable $xyzzify = -> :sgn-walkable { say $d.xyzzy };
walk($xyzzify);
I get this error.
===SORRY!===
Expression needs parens to avoid gobbling block
at /.../walkable.pl6:10
--> ble where { .signature ~~ sgn-walkable }⏏;
Missing block (apparently claimed by expression)
at /.../walkable.pl6:21
--> my Walkable $xyzzify = ⏏-> :sgn-walkable { say $d.xyzzy };
I tried to use the scalar sigil instead of the sigilless constant. To no
avail.
I am hoping for a form that allows me to define Walkables as such.
Thanks,
Theo van den Heuvel
Tobias Boege schreef op 2020-07-20 14:00:
On Mon, 20 Jul 2020, Theo van den Heuvel wrote:
Hi gurus,
after looking at the documentation on Sub, Signature and the raku type
system I find myself unable to constrain the types of functions in the
way I
think I need.
The situation: I have a function, let's call in 'walker', whose first
parameter is a callback.
I wish to express that only callbacks with a certain Signature and
return
type are acceptable.
Let's say the callback should follow :(Numeric $n --> Numeric). My
callback
is going to be more complicated, but for simplicity sake.
I was hoping to be able to use a named type of function with this
signature.
I know I can say
my $sig = :(Numeric $n --> Numeric);
but my attempts to use $sig fail. I found no example of an application
beyond smartmatching.
[...]
but I was hoping for an explicit type, maybe using class, or subset or
roles.
I hope to say soemething like
sub walker(Walkable , ...)
What am I missing here?
You said that you know how to check signatures via smartmatching.
Smartmatching is great, there isn't much to know beyond it. The way
to shoehorn smartmatching into the type system is `subset`:
subset Walkable of Callable where {
.signature ~~ :(Numeric --> Numeric)
};
If your callback signature is more complicated, all the more reason to
give it a name via subset. You can use it now almost like you wanted:
sub walker (Walkable $w) {
say $w($_) for 1..10
}
walker(-> Numeric $x --> Numeric { $x.sqrt }); # WORKS
walker(-> $x { $x.sqrt }); # DOESN'T
You cannot write `Walkable ` in the signature of because the
combination of a type and the &-sigil apparently means that `` should
be Callable and return a Walkable. That's why I use the $-sigil. [*]
Note that if you constrain the signature of a Callable, then you have
to provide the appropriate signature statically, as demonstrated.
Best,
Tobias
[*] N.B. I failed to find a reference for this in the documentation.
I discovered it by writing `sub walker (Int )` and provoking a type
checking error which told me that it was expecting `Callable[Int]`.
(That was also my gut feeling.) According to source code, Callable is
a parametric role in Rakudo whose first parameter indeed is the return
type. This is all somewhat nebulous to me (how does the Callable-
parametric way to specify return type compare with smartmatching
against .signature, for example? They don't seem equivalent!), so
I stick with the $-sigil.
BUILD and TWEAK
Trying to update the documentation on submethod TWEAK - there is nothing.
But the documentation should be accurate and not confusing. So some
questions:
In a loop or program, things like BUILD or LEAVE or FIRST are called
'phasers'.
By analogy, during the 'build' process of instantiating an object from a
class, two 'submethod's can be called, viz.
submethod BUILD and submethod TWEAK.
1) Should these submethods be considered 'phasers' to be consistent with
other BUILD, LEAVE etc usages?
2) What actually calls these submethods?
The documentation says 'bless' indirectly calls submethod BUILD. But the
documentation seems to indicate that 'bless' is not needed to create an
object.
So what calls the submethods?
3) Is it correct to say that TWEAK can access all the attributes of the
object?
4) How to describe the way the TWEAK of a subclass accesses attributes
in the parent?
eg
class A { has $.thing }
class B is A { submethod TWEAK { #do something to $.thing in A } }
Re: recent perl6 book
Thank you a lot JJ. On Tue, Jul 21, 2020 at 3:11 PM JJ Merelo wrote: > I would obviously suggest my own book > https://www.apress.com/gp/book/9781484249550, Perl 6 Quick Syntax > Reference, published last October. > And we'll have to try and find a way to update that file... > > El mar., 21 jul. 2020 a las 4:02, Warren Pang () > escribió: > >> Greetings, >> >> Would you suggest a recent release of perl6 book? >> I took a look here: >> https://perl6book.com/ >> >> They seem out of date, most were published before 2018. >> >> Thank you. >> > > > -- > JJ >
Re: recent perl6 book
OK, it's right there, at the bottom https://github.com/moritz/perl6book-web El mar., 21 jul. 2020 a las 9:11, JJ Merelo () escribió: > I would obviously suggest my own book > https://www.apress.com/gp/book/9781484249550, Perl 6 Quick Syntax > Reference, published last October. > And we'll have to try and find a way to update that file... > > El mar., 21 jul. 2020 a las 4:02, Warren Pang () > escribió: > >> Greetings, >> >> Would you suggest a recent release of perl6 book? >> I took a look here: >> https://perl6book.com/ >> >> They seem out of date, most were published before 2018. >> >> Thank you. >> > > > -- > JJ > -- JJ
Re: recent perl6 book
I would obviously suggest my own book https://www.apress.com/gp/book/9781484249550, Perl 6 Quick Syntax Reference, published last October. And we'll have to try and find a way to update that file... El mar., 21 jul. 2020 a las 4:02, Warren Pang () escribió: > Greetings, > > Would you suggest a recent release of perl6 book? > I took a look here: > https://perl6book.com/ > > They seem out of date, most were published before 2018. > > Thank you. > -- JJ
