Factory

Constructors and Factory Constructors

Master Dart's constructor forms, default, named, const, and factory constructors, and learn when each pattern is the right tool for building objects.

Abstract Factory Pattern

Provides an interface for creating families of related objects without specifying their concrete classes.

Factory Method Pattern

Defines an interface for creating an object but lets subclasses decide which concrete class to instantiate.

Flask Application Factories

Why and how to build Flask apps with a create_app() factory function, enabling multiple configured instances, easier testing, and fewer circular imports.

Singleton and Factory Patterns

Learn how Singleton guarantees a single instance and how Factory Method delegates object creation to a central point.