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Lessons (4)

• 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 …

• D — Dependency Inversion Principle

  … Functional code DI container NestJS @Injectable() , InversifyJS Large apps with many dependencies ts // NestJS does the wiring for …

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

  … class lifecycle methods, test frameworks ( beforeEach → test → afterEach ), NestJS lifecycle hooks. 💡 Modern alternative: pass the varying steps as …

• Structural Patterns: How to Connect Objects

  … middleware, React Higher-Order Components ( withRouter(Component) ), TypeScript/NestJS @decorators . --- 3. Facade 🏨 Analogy: A hotel concierge. You say …