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Lessons (7)

• Which Pattern Do I Need?

  … The intent is what matters. These look alike… The difference --- --- Decorator vs Proxy Decorator adds behaviour. Proxy controls …

• Structural Patterns: How to Connect Objects

  Adapter, Decorator, Facade, Proxy, Composite, Bridge and Flyweight. How to plug incompatible pieces together and build big structures …

• What Are Design Patterns?

  … connect objects into bigger structures? Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy 🗣️ Behavioral How do objects talk …

• Database Relations & Foreign Keys

  … ownership rule A relation is not an ORM decoration. It is a database promise: an order belongs to …

• Backend Languages: Node.js, Go, Python & Rust

  … NestJS (structured, TypeScript-first) NestJS adds modules, dependency injection and decorators on top of Express/Fastify, similar to …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … Template Method 🍰 Analogy: Every cake recipe has the same skeleton: prepare → mix → bake → decorate . A chocolate cake and …

• Clean Architecture in Depth

  … 3000 }); expect(charges).toEqual([3000]); }); Common mistakes Mistake Why it hurts Fix --- --- --- ORM decorators ( @Entity , @Column ) on domain …