Command Pattern

(function(){
 
  var CarManager = {

      requestInfo: function( model, id ){
        return "The information for " + model + " with ID " + id + " is foobar";
      },

      buyVehicle: function( model, id ){
        return "You have successfully purchased Item " + id + ", a " + model;
      },
     
      arrangeViewing: function( model, id ){
        return "You have successfully booked a viewing of " + model + " ( " + id + " ) ";
      }
   
    };
   
})();


CarManager.execute = function ( name ) {
    return CarManager[name] && CarManager[name].apply( CarManager, [].slice.call(arguments, 1) );
};


CarManager.execute( "arrangeViewing", "Ferrari", "14523" );
CarManager.execute( "requestInfo", "Ford Mondeo", "54323" );
CarManager.execute( "requestInfo", "Ford Escort", "34232" );
CarManager.execute( "buyVehicle", "Ford Escort", "34232" );