text: 
      angular
          .module('angularStubApp')
          .factory('countriesService', countriesService);
  
      function countriesService() {
          var countries = null;
          return {
              getCountries: getCountries
          };
  
          function getCountries() {
              return countries || initCountries();
          }
  
          /**
           * https://en.wikipedia.org/wiki/ISO_3166-1
           * alpha-2 codes
           */
          function initCountries() {
              countries = [
                  'AF', //Afghanistan
                  'AX', //Åland Islands
                  'AL', //Albania
                  'DZ', //Algeria
                  'AS', //American Samoa
                  'AD', //Andorra
                  'AO', //Angola
                  'AI', //Anguilla
                  'AQ', //Antarctica
                  'AG', //Antigua and Barbuda
                  'AR', //Argentina
                  'AM', //Armenia
                  'AW', //Aruba
                  'AU', //Australia
                  'AT', //Austria
                  'AZ', //Azerbaijan
                  'BS', //Bahamas
                  'BH', //Bahrain
                  'BD', //Bangladesh
                  'BB', //Barbados
                  'BY', //Belarus
                  'BE', //Belgium
                  'BZ', //Belize
                  'BJ', //Benin
                  'BM', //Bermuda
                  'BT', //Bhutan
                  'BO', //Bolivia, Plurinational State of
                  'BQ', //Bonaire, Sint Eustatius and Saba
                  'BA', //Bosnia and Herzegovina
                  'BW', //Botswana
                  'BV', //Bouvet Island
                  'BR', //Brazil
                  'IO', //British Indian Ocean Territory
                  'BN', //Brunei Darussalam
                  'BG', //Bulgaria
                  'BF', //Burkina Faso
                  'BI', //Burundi
                  'KH', //Cambodia
                  'CM', //Cameroon
                  'CA', //Canada
                  'CV', //Cape Verde
                  'KY', //Cayman Islands
                  'CF', //Central African Republic
                  'TD', //Chad
                  'CL', //Chile
                  'CN', //China
                  'CX', //Christmas Island
                  'CC', //Cocos (Keeling) Islands
                  'CO', //Colombia
                  'KM', //Comoros
                  'CG', //Congo
                  'CD', //Congo, the Democratic Republic of the
                  'CK', //Cook Islands
                  'CR', //Costa Rica
                  'CI', //Côte d'Ivoire
                  'HR', //Croatia
                  'CU', //Cuba
                  'CW', //Curaçao
                  'CY', //Cyprus
                  'CZ', //Czech Republic
                  'DK', //Denmark
                  'DJ', //Djibouti
                  'DM', //Dominica
                  'DO', //Dominican Republic
                  'EC', //Ecuador
                  'EG', //Egypt
                  'SV', //El Salvador
                  'GQ', //Equatorial Guinea
                  'ER', //Eritrea
                  'EE', //Estonia
                  'ET', //Ethiopia
                  'FK', //Falkland Islands (Malvinas)
                  'FO', //Faroe Islands
                  'FJ', //Fiji
                  'FI', //Finland
                  'FR', //France
                  'GF', //French Guiana
                  'PF', //French Polynesia
                  'TF', //French Southern Territories
                  'GA', //Gabon
                  'GM', //Gambia
                  'GE', //Georgia
                  'DE', //Germany
                  'GH', //Ghana
                  'GI', //Gibraltar
                  'GR', //Greece
                  'GL', //Greenland
                  'GD', //Grenada
                  'GP', //Guadeloupe
                  'GU', //Guam
                  'GT', //Guatemala
                  'GG', //Guernsey
                  'GN', //Guinea
                  'GW', //Guinea-Bissau
                  'GY', //Guyana
                  'HT', //Haiti
                  'HM', //Heard Island and McDonald Islands
                  'VA', //Holy See (Vatican City State)
                  'HN', //Honduras
                  'HK', //Hong Kong
                  'HU', //Hungary
                  'IS', //Iceland
                  'IN', //India
                  'ID', //Indonesia
                  'IR', //Iran, Islamic Republic of
                  'IQ', //Iraq
                  'IE', //Ireland
                  'IM', //Isle of Man
                  'IL', //Israel
                  'IT', //Italy
                  'JM', //Jamaica
                  'JP', //Japan
                  'JE', //Jersey
                  'JO', //Jordan
                  'KZ', //Kazakhstan
                  'KE', //Kenya
                  'KI', //Kiribati
                  'KP', //Korea, Democratic People's Republic of
                  'KR', //Korea, Republic of
                  'KW', //Kuwait
                  'KG', //Kyrgyzstan
                  'LA', //Lao People's Democratic Republic
                  'LV', //Latvia
                  'LB', //Lebanon
                  'LS', //Lesotho
                  'LR', //Liberia
                  'LY', //Libya
                  'LI', //Liechtenstein
                  'LT', //Lithuania
                  'LU', //Luxembourg
                  'MO', //Macao
                  'MK', //Macedonia, the former Yugoslav Republic of
                  'MG', //Madagascar
                  'MW', //Malawi
                  'MY', //Malaysia
                  'MV', //Maldives
                  'ML', //Mali
                  'MT', //Malta
                  'MH', //Marshall Islands
                  'MQ', //Martinique
                  'MR', //Mauritania
                  'MU', //Mauritius
                  'YT', //Mayotte
                  'MX', //Mexico
                  'FM', //Micronesia, Federated States of
                  'MD', //Moldova, Republic of
                  'MC', //Monaco
                  'MN', //Mongolia
                  'ME', //Montenegro
                  'MS', //Montserrat
                  'MA', //Morocco
                  'MZ', //Mozambique
                  'MM', //Myanmar
                  'NA', //Namibia
                  'NR', //Nauru
                  'NP', //Nepal
                  'NL', //Netherlands
                  'NC', //New Caledonia
                  'NZ', //New Zealand
                  'NI', //Nicaragua
                  'NE', //Niger
                  'NG', //Nigeria
                  'NU', //Niue
                  'NF', //Norfolk Island
                  'MP', //Northern Mariana Islands
                  'NO', //Norway
                  'OM', //Oman
                  'PK', //Pakistan
                  'PW', //Palau
                  'PS', //Palestinian Territory, Occupied
                  'PA', //Panama
                  'PG', //Papua New Guinea
                  'PY', //Paraguay
                  'PE', //Peru
                  'PH', //Philippines
                  'PN', //Pitcairn
                  'PL', //Poland
                  'PT', //Portugal
                  'PR', //Puerto Rico
                  'QA', //Qatar
                  'RE', //Réunion
                  'RO', //Romania
                  'RU', //Russian Federation
                  'RW', //Rwanda
                  'BL', //Saint Barthélemy
                  'SH', //Saint Helena, Ascension and Tristan da Cunha
                  'KN', //Saint Kitts and Nevis
                  'LC', //Saint Lucia
                  'MF', //Saint Martin (French part)
                  'PM', //Saint Pierre and Miquelon
                  'VC', //Saint Vincent and the Grenadines
                  'WS', //Samoa
                  'SM', //San Marino
                  'ST', //Sao Tome and Principe
                  'SA', //Saudi Arabia
                  'SN', //Senegal
                  'RS', //Serbia
                  'SC', //Seychelles
                  'SL', //Sierra Leone
                  'SG', //Singapore
                  'SX', //Sint Maarten (Dutch part)
                  'SK', //Slovakia
                  'SI', //Slovenia
                  'SB', //Solomon Islands
                  'SO', //Somalia
                  'ZA', //South Africa
                  'GS', //South Georgia and the South Sandwich Islands
                  'SS', //South Sudan
                  'ES', //Spain
                  'LK', //Sri Lanka
                  'SD', //Sudan
                  'SR', //Suriname
                  'SJ', //Svalbard and Jan Mayen
                  'SZ', //Swaziland
                  'SE', //Sweden
                  'CH', //Switzerland
                  'SY', //Syrian Arab Republic
                  'TW', //Taiwan, Province of China
                  'TJ', //Tajikistan
                  'TZ', //Tanzania, United Republic of
                  'TH', //Thailand
                  'TL', //Timor-Leste
                  'TG', //Togo
                  'TK', //Tokelau
                  'TO', //Tonga
                  'TT', //Trinidad and Tobago
                  'TN', //Tunisia
                  'TR', //Turkey
                  'TM', //Turkmenistan
                  'TC', //Turks and Caicos Islands
                  'TV', //Tuvalu
                  'UG', //Uganda
                  'UA', //Ukraine
                  'AE', //United Arab Emirates
                  'GB', //United Kingdom
                  'US', //United States
                  'UM', //United States Minor Outlying Islands
                  'UY', //Uruguay
                  'UZ', //Uzbekistan
                  'VU', //Vanuatu
                  'VE', //Venezuela, Bolivarian Republic of
                  'VN', //Viet Nam
                  'VG', //Virgin Islands, British
                  'VI', //Virgin Islands, U.S.
                  'WF', //Wallis and Futuna
                  'EH', //Western Sahara
                  'YE', //Yemen
                  'ZM', //Zambia
                  'ZW' //Zimbabwe
              ];
              return countries;
          }
  
      }