elixir-stream-unfold.ex

require Logger
limit = 100
Stream.unfold(limit, fn
  nil ->
    nil

  n ->
    Logger.info("n: #{n}")
    skip = n - limit
    Logger.info("skip: #{skip}")
    {:ok, value} = {:ok, Enum.to_list((skip..(n-1)))}

    case n do
      x when x <= 20 -> {value, n + limit}
      _ -> {value, nil}
    end

    # case Kernel.length(value) do
    #   x when x <= 10 -> {value, n + limit}
    #   # x when x > 10 -> {value, nil}
    #   _ -> {value, nil}
    # end
end)