I don't know if this is a bug, or I just don't understand what's happening. If I have a run statement as the last statement in a try block, any error in the run statement is not caught. If it is no...

Is it possible to write a META6.json file that prints a message that the operating system is not supported and does not try to install the module if the operating system is Windows?

Does perl6/Rakudo have something equivalent to perl5's __DATA__ or __END__ sections?

Raku provides a number of exception types that, on a conceptual level, are subtypes of each other. For example, X::Bind::Slice is conceptually a sub-category of X::Bind. But at an object-hierarchy ...

Should &set, Set, and Set.new have different semantics? If so, why? Consider the following code: my @array = 1, 2; my @other-array = ([3, 4],); dd set(@array, @other-array); #OUTPUT: Set.new(1...

I am looking for testing output of my function (which returns array) with the expected output array. Example: use Test; sub myoutput($n) { (1..$n)>>.sqrt } is myoutput(3), (1, 1.41421356237...

I have a function that accepts an array of positive values only. Dies when any negative value is given. # Consider edge cases # First check if all elements are > 0, if not throw informative erro...

Description There is an example: #!/bin/env raku run 'raku', '-e', 'say "ok"'; exit 0; my $*SCHEDULER = ThreadPoolScheduler.new(max_threads => 128); On linux output is: ok Unhandled e...

I have this program: class Foo { has $.first; } my $a = Attribute.new( :name('$!second'), :type(Int), :package('Foo'), :has_accessor(True) ); Foo.^add_attribute($a); Foo.^compose; Foo.^attr...

I looked at the documentation, but I didn't quite understand how to debug. I use the raku-debug command, but it reports an error: Could not find Debugger::UI::CommandLine. When I tried to search ...

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...

While finalizing my upcoming Raku Advent Calendar post on sigils, I decided to double-check my understanding of the type constraints that sigils create. The docs describe sigil type constraints wit...

I need to construct following flow: Accept list of file names Extract multiple lines from those files Process those lines However I have no idea how to properly inject gather-take into map: sub M...

I'm learning asynchronous programming in JS and I couldn't help but noticed both JS and Raku has some construct for asynchronous programming with the same name, however I'm uncertain to what extent...

I'm trying to return struct from shared library written in C. This is simple code, for testing of returning structure and simple int32, libstruct.c, compiled by gcc -shared -Wl,-soname,libstruct.so...

That is, variables like $*scalar, @*array and %*hash. I'm asking this question mainly because I want to have an idea of how much of a burden they are on the overall performance of the grammar/regex...

Recently I've been trying to learn the Raku language, and I tried to make a simple Snake Game. The code starts with this : use SDL2::Raw; use Cairo; But when I compile using rakudo raku.raku, I ge...

I am trying to use multi in my Raku code that wraps a function in C. Here I am calling lchoose function in shared libray Rmath. This is my code which works: use NativeCall; constant RMATH = "...

I'm a bit confused about how Cro handles client requests and, specifically, why some requests seem to cause Cro's memory usage to balloon. A minimal example of this shows up in the literal "He...

The documentation says that the comma operator has higher precedence than the assignment = operator, and this is specifically different than in Perl, so that we are allowed to remove parentheses in...

I'm struggling to understand why the zip-add Z+ operator does not work on some cases. I have some 2-element lists that I'd like to sum. These work as expected whether I use lists or arrays: say (1,...

I'm trying to sort a list/array of strings: > my @e = Q (list_regex_files json_file_to_ref write_2d_array_to_tex_tabular dir get_sample_ID density_scatterplot violin_plot multiline_plot ref_to_j...

This is my folder structure: C:\USERS\SUMAN\OPENMP_CMAKE │ shlib.pl │ shlib.raku │ └───resources └───libraries the shlib.raku contains this line move "shlib.pl", "resources/librari...

I am trying to run a code containing srand function: srand(1); my @x = (1..1000).roll(100); my @y = (200..7000).roll(100); say sum(@x); say sum(@y); say $*KERNEL From the docs its pretty clear tha...

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...