golang-structs-interfaces

Design small Go interfaces by limiting them to 1-3 methods and composing them to build richer behavior, which keeps code clear, testable, and idiomatic. This approach prevents premature abstractions and ensures focused type design.

Go constructors should return concrete types to avoid premature interface exposure and maintain flexibility. Accept interfaces as parameters for dependency injection, but return concrete types to allow consumers access to the full type API when needed.

The best way to use struct embedding in Go domain modeling is judiciously, combining it with type assertions and switches to keep code clear. Apply compile-time interface checks to ensure type safety and enforce concrete-return constructors for robust design.

You need compile-time interface checks in Go projects to ensure type safety and verify that concrete types satisfy expected interface contracts. This practice prevents runtime errors and enforces idiomatic type design when applying dependency injection and composition.

Dependency injection in Go does not require interfaces for every struct. Avoid premature interface exposure by defining small, focused interfaces only where behavior needs to be abstracted, accepting them as constructor parameters while returning concrete types.

Choosing between pointer and value receivers for Go struct methods depends on whether you need to mutate state or optimize large struct copying. Apply consistent receiver types and use embedding versus named fields appropriately to ensure clear, testable code.