package auth import "go2o.src.core.domain.interface.member" type Authenticator struct { members []member.IMember } func (a *Authenticator) Authenticate(username, password string) error { for _, m := range a.members { if m.Username() == username && m.Password() == password { // successful authentication return nil } } // authentication failed return errors.New("authentication failed") }
package db import "go2o.src.core.domain.interface.member" type MemberStore struct { members []member.IMember } func (s *MemberStore) FetchByID(id int) (member.IMember, error) { for _, m := range s.members { if m.ID() == id { return m, nil } } return nil, errors.New("member not found") }In this example, the `MemberStore` struct uses the `member.IMember` interface to define the members of a collection of members. It then uses the `ID()` method of the `IMember` interface to fetch a member from the collection based on their unique ID. Package library: The package library that the `go2o.src.core.domain.interface.member` belongs to is not clear from the code examples provided. It could be part of a larger package or library that deals with e-commerce or online memberships.