# ------------------------------
# Demo
# ------------------------------

my $var = [
 {
  'city' => 'New York',
  'name' => 'Bill'
 },
 {
  'city' => 'New York',
  'name' => 'Ronald'
 },
 {
  'city' => 'Boston',
  'name' => 'George'
 }
];

use Data::Dumper;
my $hData = convertKeyValueArrayToHash($var,'city','name');
print Dumper($hData), "\n";