Doing enums in go

enum.go

package main

type role uint

const (
	Unknown role = iota
	Guest
	Member
	Moderator
	Admin
)

type Role interface {
	Code() uint
	Is(Role) bool
	Slug() string
}

func (r role) Code() uint {
	return uint(r)
}

func (r role) Is(cm Role) {
	return r.Code() == cm.Code()
} 

func (r role) Slug() string {
	switch r {
	case Guest:
		return "guest"
	case Member:
		return "member"
	case Moderator:
		return "moderator"
	case Admin:
		return "admin"
	}
	return ""
}