Monads/List monad: Difference between revisions
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→{{header|Perl}}: 'strict' compliant, minor cleanup
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=={{header|Perl}}==
With the help of the CPAN module <code>Data::Monad</code>, we can work with list monads.
<lang perl>use
use feature 'say';
use Data::Monad::List;
# Cartesian product to 'count' in binary
my @cartesian = [(
list_flat_map_multi { scalar_list(join '', @_) }
scalar_list(0..1),
scalar_list(0..1),
scalar_list(0..1)
)->scalars]
say join "\n", @{shift @cartesian};
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# Pythagorean triples
my @triples = [(
list_flat_map_multi { scalar_list(
{ $_[0] < $_[1] && $_[0]**2+$_[1]**2 == $_[2]**2 ? join(',',@_) : () }
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}</lang>
{{out}}
<pre>
001
010
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