angular service/factory patterns

service_or_factory.js

angular.service('zoningLayer', function(){

  var privateVariable = 'derp';

  function privateFunction () {}

  this.create = function() {
   return new L.whatever(function(){
    return {
      fill: privateVariable(privateFunction),
      ping: pong,
      ding: dong
    }
   });
  };

});

// OR

angular.factory('zoningLayer', function(){
  
  var zoningLayer = {};

  var other, things;

  zoningLayer.create = function(){};

  return zoningLayer;

});