Add allergies to generator

exercises/allergies/.meta/exercise-data.yaml

@@ -0,0 +1,53 @@
+exercise: Allergies
+plan: 50
+subs: allergic_to list_allergies
+tests: |-
+  for my $case (@test_cases) {
+    if ( $case->{property} eq 'allergicTo' ) {
+      is allergic_to( $case->{input} ), $case->{expected} ? T : DF,
+        $case->{description};
+    }
+    elsif ( $case->{property} eq 'list' ) {
+      is
+        list_allergies( $case->{input}{score} ),
+        bag {
+          item $_ for @{ $case->{expected} };
+          end;
+        },
+        $case->{description};
+    }
+  }
+
+example: |-
+  use constant ALLERGENS => {
+    eggs         => 1,
+    peanuts      => 2,
+    shellfish    => 4,
+    strawberries => 8,
+    tomatoes     => 16,
+    chocolate    => 32,
+    pollen       => 64,
+    cats         => 128,
+  };
+
+  sub allergic_to {
+    my ($input) = @_;
+    ALLERGENS->{ $input->{item} } & $input->{score};
+  }
+
+  sub list_allergies {
+    my ($score) = @_;
+    return [ grep { allergic_to { item => $_, score => $score } }
+        keys %{ +ALLERGENS } ];
+  }
+
+stub: |-
+  sub allergic_to {
+    my ($input) = @_;
+    return undef;
+  }
+
+  sub list_allergies {
+    my ($score) = @_;
+    return undef;
+  }

exercises/allergies/.meta/solutions/Allergies.pm

@@ -1,32 +1,31 @@
 package Allergies;
-
 use strict;
 use warnings;
-
-use List::Util 'first';
-
-my @allergens
-  = qw(eggs peanuts shellfish strawberries tomatoes chocolate pollen cats);
-
-sub new {
-  my ( $class, $score ) = @_;
-  my $self = bless {} => $class;
-  $self->{score} = reverse sprintf "%08b", $score;
-
-  return $self;
-}
+use Exporter qw<import>;
+our @EXPORT_OK = qw<allergic_to list_allergies>;
+
+use constant ALLERGENS => {
+  eggs         => 1,
+  peanuts      => 2,
+  shellfish    => 4,
+  strawberries => 8,
+  tomatoes     => 16,
+  chocolate    => 32,
+  pollen       => 64,
+  cats         => 128,
+};
 
 sub allergic_to {
-  my ( $self, $allergen ) = @_;
-
-  my $index = first { $allergens[$_] eq $allergen } 0 .. $#allergens;
-
-  return substr $self->{score}, $index, 1;
+  my ($input) = @_;
+  ALLERGENS->{ $input->{item} } & $input->{score};
 }
 
-sub list {
-  [ grep { $_[0]->allergic_to($_) } @allergens ]
+sub list_allergies {
+  my ($score) = @_;
+  return [
+    grep { allergic_to { item => $_, score => $score } }
+      keys %{ +ALLERGENS }
+  ];
 }
 
-__PACKAGE__;
-
+1;

exercises/allergies/Allergies.pm

@@ -0,0 +1,17 @@
+package Allergies;
+use strict;
+use warnings;
+use Exporter qw<import>;
+our @EXPORT_OK = qw<allergic_to list_allergies>;
+
+sub allergic_to {
+  my ($input) = @_;
+  return undef;
+}
+
+sub list_allergies {
+  my ($score) = @_;
+  return undef;
+}
+
+1;