GoF Patterns

• Use structural composition over inheritance
• Use multiparadigm code and contract-programming
• Use domain-specific languages (DSLs), prefer declarative way
• Separate and do not mix system and domain code
• Use GRASP and SOLID principles; especially reduce coupling
• Remember about referential transparency
• Prefer platform-agnostic code
• Implement isolation and layer borders with IoC & DI
• Use object/Map lookup for Strategy and polymorphic/dynamic dispatch
• Keep patterns simple
• Do not over-engineer for the sake of the pattern name

Creational patterns

Abstract factory

Creates related objects belonging to one family without specifying their concrete classes, e.g., UI components for different platforms.