golang-structs-interfaces

Golang struct composition uses embedding to reuse fields and methods without traditional inheritance. It allows you to build complex type hierarchies by combining smaller, focused structs into larger ones, promoting code reuse and maintainability.

Handling type assertions and type switches in Go requires checking the boolean return value to prevent panics. This mechanism allows you to dynamically determine the underlying concrete type of an interface, enabling safe and flexible polymorphic behavior.

Implementing dependency injection using Go interfaces involves defining small interfaces for dependencies and passing them into structs as arguments. This decouples components, simplifies unit testing with mocks, and manages complex dependency relationships efficiently.

You should use interface segregation in Golang application design when clients are forced to depend on methods they do not use. Splitting large interfaces into smaller, role-specific ones prevents this bloat and ensures your type interactions remain highly cohesive.