Clean / Hexagonal Architecture

Isolating domain business rules from databases, HTTP frameworks, and external APIs.

Real-World Analogy (Mental Model)

“A medieval castle: the king and crown jewels (domain entities) stay safe in the inner keep, untouched by whatever changes happen at the outer moat.”

Key Concepts & Rules To Remember

Domain models and business logic sit in the core.
Outer layers (Postgres, HTTP, Redis) depend on inner interfaces, never the reverse.

Step-by-Step Code

1. Understanding Clean / Hexagonal Architecture

Isolating domain business rules from databases, HTTP frameworks, and external APIs. In Go, clean / hexagonal architecture is designed around clarity and high runtime efficiency.

example.goGo 1.24+

type UserRepository interface {
    GetByID(ctx context.Context, id string) (*User, error)
}

Common Beginner Pitfalls & Mistakes

Mistake: Misusing clean / hexagonal architecture without understanding its memory or concurrency semantics.

✅ Correct Way: Always follow standard Go idioms and verify with tests.

Self Assessment

Knowledge Check

Verify your understanding with these interactive practice questions.

Quizzes

Quick checks for understanding

Multiple-choice with inline explanations—expand to see why.

What is the primary concept behind Clean / Hexagonal Architecture?

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