Also known as a Globally Unique Identifier (GUID), a Universal Unique Identifier (UUID) is a 128-bit number used to uniquely identify some object or entity. The UUID relies upon a combination of components to ensure uniqueness.
Create a New UUID object
A new UUID object can either be randomly generated, or assigned.
To randomly generate a v4 UUID:
let u = UUID()
To assign a v4 UUID from a string:
let u = UUID(<String>)
If the string is invalid, the object is assigned the following UUID instead:
To return the string value of a UUID:
let u1 = UUID() print(u1.string)