Question

How to generate a UUID (Universally Unique Identifier) in Ruby

Answer 1

require 'securerandom'

# Generate a UUID v4 (random-based) using Ruby's built-in SecureRandom module.
# SecureRandom.uuid:
#   - Produces a fully RFC 4122–compliant UUID v4
#   - Uses a cryptographically secure random number generator
#   - Returns a lowercase string in canonical UUID format
#
# We wrap it in a function for clarity and reusability.
def generate_uuid_v4
  SecureRandom.uuid.downcase   # ensure lowercase output
end

# Main program
uuid = generate_uuid_v4
puts "Generated UUID v4: #{uuid}"


=begin
run:

Generated UUID v4: 72140285-2b67-45d0-a1cd-57fdc4c876d0

=end

 

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