Code for Fuzzi

SillyFunction.pm

#
# Instructions
#
# 1. Figure out what this function does
# 2. Write a unit test for it
# 3. Refactor for readability and efficiency
#
# NOTE: Do regular commits that show agile style iterations through the problem.
# If you prefer a different language, you can provide your solution in PHP, 
# Python or Javascript too.
#
package SillyFunction;

sub group_products {
    my $products = shift;
    my %brand_type = ();
    my $grouped_products = [];

    foreach (@{$products})
    {
        $brand_type{$_->{brand}} ||= {};
        $brand_type{$_->{brand}}->{$_->{type}} = 1;
    }
    foreach (sort keys %brand_type)
    {
        my $brand = $_;
        foreach (sort keys %{$brand_type{$brand}}) {
            push(@{$grouped_products}, { brand => $brand, type => $_});
        }
    }

    $grouped_products;
}

use v5.10.0;
use Data::Dumper;

my @array = (
    { brand => 'foo', type => 'chips' },
    { brand => 'foo', type => 'fish' },
    { brand => 'bar', type => 'kitten' },
    { brand => 'bar', type => 'fish' },
);

say Dumper group_products \@array;

# Does exactly the same as:

say Dumper [ sort { 
    $a->{brand} cmp $b->{brand} ||
    $a->{type}  cmp $b->{type}
} ( @array ) ];

# and produces:

=begin data

$DATA = [
          {
            'type' => 'fish',
            'brand' => 'bar'
          },
          {
            'type' => 'kitten',
            'brand' => 'bar'
          },
          {
            'type' => 'chips',
            'brand' => 'foo'
          },
          {
            'type' => 'fish',
            'brand' => 'foo'
          }
        ];

=cut

1;