uuid generates a Universally Unique IDentifier based on the standards set in RFC4122 and [DCE1.1] (http://pubs.opengroup.org/onlinepubs/9629399/apdxa.htm).
Version 1, 2, and 4 returns just a UUID object
v1 := uuid.NewV1()
v2 := uuid.NewV2()
v4 := uuid.NewV4()Version 3 and 5 return a UUID object along with an error. This is in case something went wrong while hashing. Additionally, they require a UUID compliant Namespace and a name. This package provides 4 namespaces for use (DNSNamespace, URLNamespace, IODNamespace, and X500Namespace), but any UUID may be used.
v3, err := uuid.NewV3(uuid.DNSNamespace, "name")
...
v5, err := uuid.NewV5(uuid.DNSNamespace, "name")The package also provides a String() func to convert the bytes to hex format
v1 := uuid.NewV1()
v1.String()