Intro & Principles
What patterns are, SOLID, composition over inheritance, and reading UML. Start →
Design Patterns — From Zero to Hero
A standalone, beginner→advanced course on software design patterns. Start with the principles (SOLID, composition over inheritance), then work through all 23 Gang-of-Four patterns — each with a UML diagram and the same example in TypeScript, Python, Go, and Rust.
What you’ll learn
Section titled “What you’ll learn”Creational Patterns
Singleton, Factory Method, Abstract Factory, Builder, Prototype. Create →
Structural Patterns
Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy. Compose →
Behavioral Patterns I
Strategy, Observer, Command, State, Template Method, Iterator. Coordinate →
Behavioral Patterns II
Chain of Responsibility, Mediator, Memento, Visitor, Interpreter. Go deeper →
How this course works
Section titled “How this course works”Four languages, side by side
Every pattern’s example appears in TypeScript, Python, Go, and Rust — synced tabs, so pick your language once and it follows you.
UML you can read
Each pattern has a Mermaid class diagram of its structure — theme-aware and explained as you go.
Intent, not just code
Each pattern covers intent, the problem it solves, trade-offs, and related patterns — so you know when (and when not) to use it.
Bilingual + read mode
English and ไทย, quizzes with saved progress, and a distraction-free read mode.