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Perl/Raku Programming

Submitted by Roy Schestowitz on Wednesday 23rd of June 2021 04:53:01 AM Filed under
Development
  • What they say in Java is just as true in Perl
  • An Error In The Roles Article - LFlat, The Home of Vrurg

    The recently published article contained a factual error, as was pointed out by Elizabeth Mattijsen. I stated that named arguments do not work in role parameterization but it is not true. Yet, what I was certain about is that there is clearly something wrong about them. It took a bit of my time and wandering around Rakudo sources to recover my memories. The actual problem about named parameters is less evident and I dedicated a section of the article to explain what is actually going on.

    In this post I will share more detailed explanation of what’s going on for those interested in it. If anybody wish to follow me by watching the code open the src/Perl6/Metamodel/ParametricRoleGroupHOW.nqp file in Rakudo sources. There we start with method parameterize. Remember in the meanwhile, that the code is NQP meaning it looks like Raku but it lacks many features of it.

    [...]

    But what happens when named parameters are involved? To make it possible to dispatch over them ParametricRoleGroupHOW does a trick: it takes the slurpy hash of nameds and uses it as a single positional argument which is appended to the end of @args array of positionals. To be consistent, if there are no nameds are passed in, NO_NAMEDS constant is pushed instead.

  • Rakudo Weekly News: 2021.25 Small Steps

    Alexander Kiryuhin has again released a version of the Rakudo Compiler implementing the Raku Programming Language: the 2021.06 Compiler Release!

»

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