uuidmod

Overview ¶

Package uuidmod is the native module "uuid": new UUIDs as strings (TODO.md Q58).

use uuid;
println(uuid::v7());                 // 019a1b2c-3d4e-7f60-8a9b-0c1d2e3f4a5b
println(uuid::valid("not a uuid"));  // false

Version 7 is ordered by time (its first 48 bits are the time in milliseconds), so new keys land at the end of a database index; version 4 is entirely random. The db module's object mapping uses version 7 for a key declared "UUID". Versions 5 and 3 are derived from a namespace and a name (RFC 9562 section 5.5 and 5.3), so the same name always gives the same UUID; the module has the standard namespaces as constants.