Usefall

The Singleton Pattern

Many things of a kind may exist.

I want to ensure I always work with the same single one of them.

The Prototype Pattern

A complex thing exists.

I want to create a thing just like it, but with slight modifications.

The Builder Pattern

A complex thing is created.

I want to simplify its creation.

The Abstract Factory Pattern

Things are created then other things are happening.

I want to change the kind of things that are created without affecting anything else.

The Factory Method Pattern

Something is created then other things are happening.

I want to change what is created without affecting the other things.