What is the difference between Go's struct embedding and struct composition?

In Go, both struct embedding and struct composition are used for code reuse and building complex data structures.

Struct embedding involves creating a new struct type by embedding an existing struct type inside it. This allows the new struct type to inherit the fields and methods of the embedded type, which can be accessed using dot notation. Struct embedding is useful for code reuse and creating new types that are composed of existing types.

Struct composition involves creating a new struct type by composing multiple existing struct types together. This is done by declaring fields in the new struct type that are themselves structs. Struct composition allows for more fine-grained control over the fields and methods of the resulting type, and can be used to create complex data structures that are tailored to specific use cases.

In essence, struct embedding is a way to inherit fields and methods from an existing struct type, while struct composition is a way to create new struct types by combining multiple existing types.