UUIDs
UUIDs.uuid1 — Function
uuid1([rng::AbstractRNG]) -> UUID
Generates a version 1 (time-based) universally unique identifier (UUID), as specified by RFC 4122. Note that the Node ID is randomly generated (does not identify the host) according to section 4.5 of the RFC.
The default rng used by uuid1
is not GLOBAL_RNG
and every invocation of uuid1()
without an argument should be expected to return a unique identifier. Importantly, the outputs of uuid1
do not repeat even when Random.seed!(seed)
is called. Currently (as of Julia 1.6), uuid1
uses Random.RandomDevice
as the default rng. However, this is an implementation detail that may change in the future.
Julia 1.6
The output of uuid1
does not depend on GLOBAL_RNG
as of Julia 1.6.
Examples
julia> rng = MersenneTwister(1234);
julia> uuid1(rng)
UUID("cfc395e8-590f-11e8-1f13-43a2532b2fa8")
UUIDs.uuid4 — Function
uuid4([rng::AbstractRNG]) -> UUID
Generates a version 4 (random or pseudo-random) universally unique identifier (UUID), as specified by RFC 4122.
The default rng used by uuid4
is not GLOBAL_RNG
and every invocation of uuid4()
without an argument should be expected to return a unique identifier. Importantly, the outputs of uuid4
do not repeat even when Random.seed!(seed)
is called. Currently (as of Julia 1.6), uuid4
uses Random.RandomDevice
as the default rng. However, this is an implementation detail that may change in the future.
Julia 1.6
The output of uuid4
does not depend on GLOBAL_RNG
as of Julia 1.6.
Examples
julia> rng = MersenneTwister(1234);
julia> uuid4(rng)
UUID("7a052949-c101-4ca3-9a7e-43a2532b2fa8")
UUIDs.uuid5 — Function
uuid5(ns::UUID, name::String) -> UUID
Generates a version 5 (namespace and domain-based) universally unique identifier (UUID), as specified by RFC 4122.
Julia 1.1
This function requires at least Julia 1.1.
Examples
julia> rng = MersenneTwister(1234);
julia> u4 = uuid4(rng)
UUID("7a052949-c101-4ca3-9a7e-43a2532b2fa8")
julia> u5 = uuid5(u4, "julia")
UUID("086cc5bb-2461-57d8-8068-0aed7f5b5cd1")
UUIDs.uuid_version — Function
uuid_version(u::UUID) -> Int
Inspects the given UUID and returns its version (see RFC 4122).
Examples
julia> uuid_version(uuid4())
4