Image

head

code

root

para

L<Examples| file:../examples/index.podlite>


L<Download |file:../download/index.podlite>


React

=begin React :component<HeaderCol> :id<menu> 
=para L<Documentation|/doc/introduction>
=para L<Modules| /mods>
=para L<Examples| file:../examples/index.podlite>
=para L<Download |file:../download/index.podlite>
=para L<About|file:../about/index.podlite>
=para 🔍 K<⌘K>/K<ctrl-K>
=end React


HEADER

FOOTER

README

item

use nqp;  # intended to also go in core

my $empty := nqp::list();  # for removing elements with nqp::splice

# Return an iterator that will slip all values of the given iterables
# roundrobinly.  Basically the functionality of roundrobin(@a,@b, :slip)
my class RoundrobinIterablesSlipped does Iterator {
    has $!iters;
    has $.is-lazy;
    has int $!i;
    method !SET-SELF(\iterables) {
        my $iterables := nqp::getattr(iterables,List,'$!reified');
        my int $elems = nqp::elems($iterables);
        $!iters   := nqp::setelems(nqp::list,$elems);
        $!is-lazy := False;

        my int $i = -1;
        nqp::while(
          nqp::islt_i(($i = nqp::add_i($i,1)),$elems),
          nqp::bindpos($!iters,$i,
            nqp::if(
              nqp::iscont(my $elem := nqp::atpos($iterables,$i)),
              Rakudo::Iterator.OneValue($elem),
              nqp::stmts(
                nqp::if($elem.is-lazy,($!is-lazy := True)),
                $elem.iterator
              )
            )
          )
        );
        self
    }
    method new(\iterables) { nqp::create(self)!SET-SELF(iterables) }
    method pull-one() {
        nqp::while(
          nqp::islt_i($!i,nqp::elems($!iters))
            && nqp::eqaddr(
                 (my $pulled := nqp::atpos($!iters,$!i).pull-one),
                 IterationEnd
               ),
          nqp::stmts(
            nqp::splice($!iters,$empty,$!i,1),       # remove exhausted
            nqp::if(                                 # check at same index
              nqp::isge_i($!i,nqp::elems($!iters)),  # unless it was last
              ($!i = 0)
            )
          )
        );
        $!i = 0 if nqp::isge_i(++$!i,nqp::elems($!iters));
        $pulled
    }
}

multi sub roundrobin(+lol, :$slip!) is export {
    Seq.new: nqp::isgt_i(lol.elems,0)  # reifies
      ?? RoundrobinIterablesSlipped.new(lol)
      !! Rakudo::Iterator.Empty
}

sub EXPORT() {
    (try &CORE::roundrobin(1, :slip))
      ?? Map.new    # already in core
      !! Map.new( ('&roundrobin' => &roundrobin) )
}



roundrobin-slip - Provide roundrobin(:slip) for older Rakus


=begin code :lang<raku>

use roundrobin-slip;

.say for roundrobin((1,2), (3,4));        # (1 3)␤(2 4)␤

.say for roundrobin((1,2), (3,4), :slip); # 1␤3␤2␤4␤

=end code


roundrobin-slip is a distribution that provides an extra candidate for
the L<roundrobin|https://docs.raku.org/routine/roundrobin> function that
will automatically L<slip|https://docs.raku.org/routine/slip> all values
that are produced.


Source can be located at: https://github.com/lizmat/roundrobin-slip .
Comments and Pull Requests are welcome.


This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.


roundrobin-slip

The Raku Knowledge Base


=begin React :component<HeaderCol> :id<footer>  
=begin nested :!nested
=item1 B<Language>
    =item2 L<Get started|file:../getting-started/getting-started.podlite>
    =item2 L<Why Raku?|/doc/language/faq#Why-should-I-learn-Raku-What's-so-great-about-it>
    =item2 L<Try Raku|https://glot.io/new/raku>
    =item2 L<Raku cheat sheet|https://github.com/Raku/mu/blob/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<Raku on Exercism|https://exercism.org/tracks/raku>
    =item2 L<Wikipedia|https://en.wikipedia.org/wiki/Raku_(programming_language)>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=begin nested :!nested

=item1 B<L<Documentation|/doc>>
    =item2 L<Getting started, Migration guides from other languages, & Tutorials | file:../doc/introduction.podlite>
    =item2 L<Language References|file:../doc/reference.podlite>
    =item2 L<Type Reference| file:../doc/types.podlite>
    =item2 L<Miscellaneous| file:../doc/miscellaneous.podlite>
    =item2 L<FAQs (Frequently Asked Questions)|/doc/language/faq>
    =item2 L<Community|/doc/language/community>
    =item2 L<The list of all documents|file:../doc/index.podlite>

=item1 B<Resources>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>

=end nested
=begin nested :!nested

=item1 B<Resoures>
    =item2 L<Download | file:../download/index.podlite>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=item1 B<Learning>
    =item2 L<The Raku Guide|https://raku.guide/>
    =item2 L<Wikibook |https://en.wikibooks.org/wiki/Raku_Programming>
    =item2 L<Books |https://perl6book.com/>
    =item2 L<Rosetta Code | https://www.raku.org/community/rosettacode>
    =item2 L<Learn Raku in Y minutes|https://learnxinyminutes.com/docs/raku/>
    =item2 L<Golfing |https://github.com/AlexDaniel/raku-golf-cheatsheet>
=end nested
=begin nested :!nested

=item1 B<Explore>
    =item2 L<Raku Blog Aggregator|https://planet.raku.org/>
    =item2 L<Rakudo Weekly|https://rakudoweekly.blog/>
    =item2 L<The Weekly Challenge |https://perlweeklychallenge.org/>
    =item2 L<Raku Advent Calendar|https://raku-advent.blog/>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>
    =item2 L<empty|#>

=end nested
=end React


=begin React :component<CookieConsent> :id<CookieConsent> :buttonCaption("Got it!")
=para
This website uses cookies for analytics.
=end React


README

NAME

SYNOPSIS

DESCRIPTION

AUTHOR

COPYRIGHT AND LICENSE

roundrobin-slip v0.0.1

Authors

License

Dependencies

Test Dependencies

Provides

Documentation