Advanced Search

Return to Snippet

Revision: 58825
at August 3, 2012 18:42 by timsommer
Updated Code 
function VehicleFactory() {}

VehicleFactory.prototype.vehicleClass = Car;
VehicleFactory.prototype.getVehicle = function (options) {
    return new this.vehicleClass(options);
};

var carFactory = new VehicleFactory();
var car = carFactory.getVehicle({ color: "yellow", turbo: true });

console.log(car instanceof Car); // => true

// approach #1: Modify a VehicleFactory instance to use the Truck class
carFactory.vehicleClass = Truck;
var mover = carFactory.getVehicle({ enclosedCargo: true, length: 26 });
counsole.log(mover instanceof Truck); // => true

// approach #2: Subclass VehicleFactory to create a factory class that
// builds Trucks
function TruckFactory () {}

TruckFactory.prototype = new VehicleFactory();
TruckFactory.prototype.vehicleClass = Truck;

var truckFactory = new TruckFactory();
var bigfoot = truckFactory.getVehicle({ monster: true, cylinders: 12 });

console.log(bigfoot instanceof Truck); // => true

Revision: 58824
at August 3, 2012 18:41 by timsommer
Initial Code 
function VehicleFactory() {}
VehicleFactory.prototype.vehicleClass = Car;
VehicleFactory.prototype.getVehicle = function (options) {
    return new this.vehicleClass(options);
};
var carFactory = new VehicleFactory();
var car = carFactory.getVehicle({ color: "yellow", turbo: true });
console.log(car instanceof Car); // => true
// approach #1: Modify a VehicleFactory instance to use the Truck class
carFactory.vehicleClass = Truck;
var mover = carFactory.getVehicle({ enclosedCargo: true, length: 26 });
counsole.log(mover instanceof Truck); // => true
// approach #2: Subclass VehicleFactory to create a factory class that
// builds Trucks
function TruckFactory () {}
TruckFactory.prototype = new VehicleFactory();
TruckFactory.prototype.vehicleClass = Truck;
var truckFactory = new TruckFactory();
var bigfoot = truckFactory.getVehicle({ monster: true, cylinders: 12 });
console.log(bigfoot instanceof Truck); // => true
Initial URL 

                                

                                                            

                                    

                                        

                                        Initial Description
                                        

                                    

                                    
The Factory Pattern suggests defining an interface for creating an object where you allow the subclasses to decide which class to instantiate. This pattern handles the problem by defining a completely separate method for the creation of objects and which sub-classes are able to override so they can specify the ‘type’ of factory product that will be created.

                                

                                                            

                                    

                                        

                                        Initial Title
                                        

                                    

                                    
JavaScript Factory Pattern

                                

                                                            

                                    

                                        

                                        Initial Tags
                                        

                                    

                                    
javascript

                                

                                                            

                                    

                                        

                                        Initial Language
                                        

                                    

                                    
JavaScript