gistfile1.txt

def psuedorandoms seed
  Enumerator.new do |yielder|
    loop do
      seed = Digest::MD5.digest(seed)
      seed.unpack("Q*").each do |number|
        yielder.yield number.to_f / 2**64
      end
    end
  end
end

random = psuedorandoms "bob@example.com"

random.next
# => 0.7001791074933145
random.next
# => 0.23889280018014822
random.next
# => 0.7562936345272123