gistfile1.coffee

app.factory 'json', ['$q', ($q) ->
  name = 'henry'
  
  service = (_name) ->
    if _name? then name = _name
    service
  
  service.greet = (greeting='Hello') ->
    deferred = $q.defer()
    
    setTimeout (-> deferred.resolve "#{greeting} #{name}"), 1000
    
    deferred.promise
  
  service
]

gistfile2.js

app.factory('json', [
  '$q', function($q) {
    var name, service;
    name = 'henry';
    service = function(_name) {
      if (_name != null) {
        name = _name;
      }
      return service;
    };
    service.greet = function(greeting) {
      var deferred;
      if (greeting == null) {
        greeting = 'Hello';
      }
      deferred = $q.defer();
      setTimeout((function() {
        return deferred.resolve("" + greeting + " " + name);
      }), 1000);
      return deferred.promise;
    };
    return service;
  }
]);