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Lessons (19)

• I — Interface Segregation Principle

  … fat interfaces cause LSP violations. The fix: small, role-based interfaces ts // ✅ One interface per capability interface Printer …

• Onion Architecture & Clean vs Hexagonal vs Onion

  … interfaces live in the inside Just like the other two styles, the repository interface is declared in an …

• Clean Architecture

  … one action each Entities + interfaces RegisterUser , PlaceOrder 🔵 Interface adapters Controllers, presenters, repositories Use cases UserController , PostgresUserRepo 🟣 Frameworks …

• Clean Architecture in Depth

  … one class per user action The application's behaviour changes Entities + port interfaces 🔵 Interface adapters Controllers, presenters, gateways …

• SOLID at a Glance

  … TypeScript adds real interfaces. - Functions are first-class, so you can often pass a function where Java would …

• Which Pattern Do I Need?

  … Proxy controls access to the same behaviour. Adapter vs Facade Adapter makes one interface fit another. Facade simplifies …

• D — Dependency Inversion Principle

  … details point UP to abstractions"] OS2[OrderService] -- R{{OrderRepository<br/ interface}} OS2 -- M{{Mailer<br/ interface}} MySQL[MySQLOrderRepository …

• Hexagonal Architecture (Ports & Adapters)

  … Promise<void ; } export interface LoanRepository { save(loan: Loan): Promise<void ; countActiveFor(memberId: string): Promise<number ; } export interface Notifier …

• TypeScript Essentials

  … Learn the core types, interfaces, unions, generics and utility types with practical examples. The big idea Imagine electrical …

• Monolith vs Microservices

  … each module has its own folder, public interface and (ideally) its own database schema. Modules talk only through …

• O — Open/Closed Principle

  … body<br/ (never changes)"] --- M{{Lens mount<br/ = interface}} M --- L1[Wide lens] M --- L2[Zoom lens] M …

• Structural Patterns: How to Connect Objects

  … Adapter Make incompatible interfaces work together 🔌 travel plug Decorator Wrap to add behaviour, same interface ☕ coffee toppings Facade …

• MVC, MVP & MVVM

  … The Presenter holds all the presentation logic and talks to the View through an interface, which makes it …

• Microkernel (Plugin) Architecture

  … the ONLY thing plug-ins import from the core export interface MarkdownPlugin { name: string; version: string; / Transform raw …

• Views, Triggers & Stored Procedures

  … It can simplify joins, expose a secure subset, and give clients a stable interface. A materialized view stores …

• Vertical Slice Architecture & the Modular Monolith

  … Neighbours can't walk into each other's kitchens; they knock (a public interface). A modular monolith is …

• Domain-Driven Design: Tactical Patterns

  … a port), implemented in infrastructure (an adapter) export interface OrderRepository { get(id: OrderId): Promise<Order ; // loads the WHOLE …

• Code Smells & Refactoring

  … map((shape) = shape.area()); mermaid classDiagram class Shape { <<interface area() } Shape < .. Circle Shape < .. Square Shape < .. Triangle Adding a …

• Creational Patterns: How to Make Objects

  … send("Your order shipped!"); mermaid classDiagram class Notifier { <<interface +send(msg) } Notifier < .. EmailNotifier Notifier < .. SmsNotifier Notifier < .. PushNotifier createNotifier …