Design-pattern

Singleton pattern - Create only one instance on the application lifecycle.

Overview design pattern - OOP design.

A method to connect multiple standalone objects

A way to structure a group of objects

Create a layer to connect an old layer to a new layer

An object needs to be cloned from an existing object.

There are many variations for one type; instead of passing parameters to the constructor, using a builder is more convenient.

Using the Factory Method Pattern to add many types within the same family is considered an Abstract Factory.

If there is only one factory for all Products, it is no longer the Factory Method but a Simple Factory.