> map[rhubarb]bool is how Go does sets Actually, you should use map[rhubarb]struct{} since a struct{} requires no storage. You can test membership with this:

> map[rhubarb]bool is how Go does sets Actually, you should use map[rhubarb]struct{} since a struct{} requires no storage. You can test membership with this: _, ok := m[strawberryRhubarb]