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


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=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>
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use nqp;  # basically the code of Any.are from 2022.01 onward

my proto sub are(|) is export {*}
my multi sub are(Any:U $what) { $what      }
my multi sub are(Any:D $what) { $what.WHAT }
my multi sub are(Iterable:D $values) { infer $values.iterator }
my multi sub are(*@values)           { infer @values.iterator }

my sub infer(Iterator:D $iterator) {
    nqp::if(
      nqp::eqaddr((my $pulled := $iterator.pull-one),IterationEnd),
      Nil,                                            # nothing to check
      nqp::stmts(
        (my $type := $pulled.WHAT),                   # initial type
        nqp::until(
          nqp::eqaddr(($pulled := $iterator.pull-one),IterationEnd)
            || nqp::not_i(nqp::eqaddr($pulled.WHAT,$type)),
          nqp::null
        ),
        nqp::if(
          nqp::eqaddr($pulled,IterationEnd),
          $type,                                      # all the same
          slow-infer($iterator, $type, $pulled)       # find out what
        )
      )
    )
}
my multi sub are(Slip:D $what) {
    nqp::eqaddr($what,Empty) ?? Nil !! nextsame
}

my sub slow-infer($iterator, Mu $type is copy, Mu $pulled is copy) {
    # set up types to check
    my $mro :=
      nqp::clone(nqp::getattr($type.^mro(:roles),List,'$!reified'));

    nqp::repeat_until(
      nqp::eqaddr(($pulled := $iterator.pull-one),IterationEnd)
        || nqp::eqaddr($type,Mu),
      nqp::until(
        nqp::istype($pulled,nqp::atpos($mro,0)),
        nqp::stmts(                       # not the same base type
          nqp::shift($mro),
          ($type := nqp::atpos($mro,0)),  # assume next type for now
        )
      )
    );
    $type
}



are - produce the common type / role of a list of objects


=begin code :lang<raku>

use are;

say are 1,1.2,pi;                   # (Real)

say (1,1.2,pi,i).&are;              # (Numeric)

say (1,"one").&are;                 # (Cool)

say are DateTime.now, Date.today);  # (Dateish)

=end code


The C<are> subroutine (the only subroutine exported by this module)
returns the most common class or role from a list of objects.


It was introduced in Rakudo release 2022.01 as a method on C<Any>.
It is provided here to allow the functionality to be used with
older versions of Rakudo.


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


If you like this module, or what I’m doing more generally, committing to a
L<small sponsorship|https://github.com/sponsors/lizmat/>  would mean a great
deal to me!


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


The Raku Knowledge Base


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


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=para
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README

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are v0.0.1

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