Rakudo is a compiler for the Raku programming language running on the MoarVM virtual machine.
Rakudo is a Raku compiler running on the MoarVM, JVM and JavaScript.
Questions tagged [rakudo]
189 questions
10
votes
3 answers
set PATH in azure pipelines in Windows
I am using Azure Pipelines to build a Rakudo binary for Raku (previously aka Perl 6) in Windows.
This is my azure-pipelines.yml file:
jobs:
- job: Windows
pool:
vmImage: 'vs2017-win2016'
steps:
- bash: |
mkdir -p…
Suman Khanal
- 3,079
- 1
- 17
- 29
10
votes
2 answers
How to return a value from a block's CATCH phaser?
What is the syntax to return a value from a CATCH phaser from a block which is not a Routine?
sub foo() {
<1 2 3>.map: -> $a {
die 'oops';
CATCH { default { 'foo' } }
}
}
sub bar() {
<1 2 3>.map: -> $a {
die…
J Hall
- 531
- 3
- 10
10
votes
3 answers
How do I invoke a Java method from perl6
use java::util::zip::CRC32:from;
my $crc = CRC32.new();
for 'Hello, Java'.encode('utf-8') {
$crc.'method/update/(B)V'($_);
}
say $crc.getValue();
sadly, this does not work
Method 'method/update/(B)V' not found for invocant of class…
user7610
- 25,267
- 15
- 124
- 150
9
votes
1 answer
How to add an attribute and its accessors in Raku using add_attribute()?
I have this program:
class Foo {
has $.first;
}
my $a = Attribute.new(
:name('$!second'),
:type(Int),
:package('Foo'),
:has_accessor(True)
…
Fernando Santagata
- 1,487
- 1
- 8
- 15
9
votes
2 answers
Error install Inline::Perl5 with Zef (Raku)
I'm trying to install Raku on a Debian 11 x64. I never installed it before (perl5 too)
It's a server with some Perl5 scripts, and I want to "use" it in Raku with the Inline::Perl5 (also I want to use Perl5 Module if I don't find what I want in Raku…
Jeremie CORBION
- 91
- 1
9
votes
1 answer
RAKUDO_RAKUAST=1 raku --target=ast is not yet available
It has been almost a year since I saw Jonathan Worthington presenting the new RakuAST in the YouTube video A Raku API to Raku programs the journey so far from TRC 2021. In the video, he showed that we could dump this new RakuAST using…
WhiteMist
- 885
- 4
- 13
9
votes
2 answers
What's the point of Raku's 'mod' operator?
I previously incorrectly thought that the % operator returned the remainder and the mod operator returned the modulus (the remainder and modulus are the same when the operands are both positive or both negative but differ when one operand is…
codesections
- 8,900
- 16
- 50
9
votes
1 answer
Destructuring assignment in object creation
As with my previous question, this is an area where I can't tell if I've encountered a bug or a hole in my understanding of Raku's semantics. Last time it turned out to be a bug, but doubt lightning will strike twice!
In general, I know that I can…
codesections
- 8,900
- 16
- 50
9
votes
2 answers
Raku equivalent to JavaScript's `setTimeout(fn, 0)`?
JavaScript's event loop uses a message queue to schedule work, and runs each message to completion before starting the next. As a result, a niche-but-surprisingly-common pattern in JavaScript code is to schedule a function to run after the messages…
codesections
- 8,900
- 16
- 50
9
votes
1 answer
Could not find File::Find Raku on Windows 7
I've got a very simple program which lists all .txt files in a given directory. This program has run perfectly on my Mac which has the Rakudo Star version 2019.03.1
use File::Find;
my $folder="../Documents";
.say for find dir => $folder, name =>…
Lars Malmsteen
- 738
- 4
- 23
9
votes
1 answer
How to use hyperoperators with Scalars that aren't really scalar?
I want to make a hash of sets. Well, SetHashes, since they need to be mutable.
In fact, I would like to initialize my Hash with multiple identical copies of the same SetHash.
I have an array containing the keys for the new hash: @keys
And I have my…
Mark Reed
- 91,912
- 16
- 138
- 175
9
votes
1 answer
Is it possible to do boolean assertions with raku regex?
In the apocalypses, there are some words about boolean assertions:
<( code )> # call code as boolean assertion
However, I cannot make it work.
say "9471" ~~ m:g/ (\d) <($0 > 5)> /
I expect to only match numbers greater than 5, but I get…
Julio
- 5,208
- 1
- 13
- 42
9
votes
2 answers
Install modules in other rakudo versions using rakubrew
When upgrading rakudo version using rakubrew, is pretty easy to change versions, but I wnat to know if it is posible to import raku modules from the older version to the new version. doign zef install automatically:
to update:
rakubrew build…
anquegi
- 11,125
- 4
- 51
- 67
9
votes
3 answers
how to cycle through list indefinitely and lazily in Raku?
This is mostly to geek out on how awesome Raku is.
Question
Are there built-in methods that will take a list and cycle through it indefinitely, producing, say, the lazy list
a, b, c, a, b, c, ...
out of (a, b, c)? Nothing in the documentation on…
grobber
- 1,083
- 1
- 9
- 20
9
votes
2 answers
Does anyone know why the TWEAK routine gets hit before the BUILD routine?
Minimal code:
#!/usr/bin/raku
class Widget {
submethod TWEAK(:$content, :$styles) {
say "t1\n";
}
}
class File is Widget {
submethod BUILD() {
say "b1";
}
}
my $xml = File.new();
And the output:
t1
b1
To quote…
Timothy Nelson
- 565
- 3
- 5