Re: Having a problem creating a hash with the map function

[Kenosis]

# This is the goal
#%Belfast_car_dealer_hash = ("Toyota"=>  1,
#                            "Chrysler" => 1);
#                            "Ford" => 1);

The following will initialize your hash the way you want:

my %Belfast_car_dealer_hash = map { $_ => 1 } @dealers[1,3,4];

Dumper output of %Belfast_car_dealer_hash:

$VAR1 = {
          'Chrysler' => 1,
          'Toyota' => 1,
          'Ford' => 1
        };

Update: Added [1,3,4] to limit key creation.

My apologies; I believe I've misunderstood. What about using a hash of arrays, where the key is the city and the value is a reference to an array of dealers? Perhaps this data structure would be helpful:

use strict;
use warnings;

my @dealers = ( "Nissan", "Toyota", "Tesla", "Chrysler", "Ford", "Gene
+ral Motors" );

my %citiesDealers = (
    'Belfast' => [ @dealers[ 1, 3, 4 ] ],
    'Dublin'  => [ @dealers[ 2, 3, 0 ] ],
    'Cork'    => [ @dealers[ 0, 3 ] ],
    'Derry'   => [ @dealers[ 1, 4, 2 ] ],
    'Tralee'  => [ @dealers[ 2, 1, 0, 5 ] ]

);

print $_, "\n" for @{ $citiesDealers{'Belfast'} };

Output:

Toyota
Chrysler
Ford