Architectural patterns

Add pipeline (of pipe-filter) pattern.

Memento: State Encapsulation.

Would a section on Monads be possible? I find your diagrams very useful!

Code smell "man in the middle" type in Self-Encapsulation refactoring?

Return Early Pattern

Why is data class considered a code smell?

Singleton Examples from the Java API

Add Null Object Pattern

Change `render()` method name for Button interface in Factory pattern article