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instance method

Random::Formatter#uuid

uuid

lib/random/formatter.rb View on GitHub ↗

# File tmp/rubies/ruby-3.1.3/lib/random/formatter.rb, line 143
def uuid
  ary = random_bytes(16).unpack("NnnnnN")
  ary[2] = (ary[2] & 0x0fff) | 0x4000
  ary[3] = (ary[3] & 0x3fff) | 0x8000
  "%08x-%04x-%04x-%04x-%04x%08x" % ary
end

Random::Formatter#uuid generates a random v4 UUID (Universally Unique IDentifier).

Example

require 'random/formatter'

prng.uuid #=> "2d931510-d99f-494a-8c67-87feb05e1594"
prng.uuid #=> "bad85eb9-0713-4da7-8d36-07a8e4b00eab"
prng.uuid #=> "62936e70-1815-439b-bf89-8492855a7e6b"

The version 4 UUID is purely random (except the version). It doesn’t contain meaningful information such as MAC addresses, timestamps, etc.

The result contains 122 random bits (15.25 random bytes).

See RFC 4122 for details of UUID.

See also #urlsafe_base64 #random_number also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0

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