In LiveViewTest’s implementation of open_browser, it creates a temp file. To name that, it implements a function that generates a bunch of random bytes which is used to make a filename that looks like: "phx-#{random_id}". The function looks like this:

  def random_id do
    "phx-"
    |> Kernel.<>(random_encoded_bytes())
    |> String.replace(["/", "+"], "-")
  end

and random_encoded_bytes looks like this:

  defp random_encoded_bytes do
    binary = <<
      System.system_time(:nanosecond)::64,
      :erlang.phash2({node(), self()})::16,
      :erlang.unique_integer()::16
    >>

    Base.url_encode64(binary)
  end

My question is not about the implementation of these functions but rather: what’s wrong with simply using "phx#{System.unique_integer()"? I’ve thought on it a bunch but can’t come up with an answer.

Thanks!

mods: I wasn’t exactly sure where to put this. I mention LiveView but the question isn’t really about Phoenix but it’s also not even really about Elixir specifically! Apologies if it needs moving.