An Elixir module with a single function demonstrating an `Enum.zip` implementation with wrap-around of the second list argument.

lists.ex

defmodule Lists
  @doc """
  Works similarly to `Enum.zip/2` but it also wraps around the second list parameter,
  for example `zip_cycle([1, 2, 3, 4], [:x, :y, :z])` yields `[{1, :x}, {2, :y}, {3, :z}, {4, :x}]`.
  It never produces more items than the length of the first list.
  """
  def zip_cycle([h0 | t0] = _l0, [h1 | t1] = l1),
    do: zip_cycle(t0, t1, l1, [{h0, h1}])

  def zip_cycle(_l0, _l1), do: []

  defp zip_cycle([h0 | t0], [h1 | t1], l1, acc),
    do: zip_cycle(t0, t1, l1, [{h0, h1} | acc])

  defp zip_cycle([h0 | t0], [], [h1 | t1] = l1, acc),
    do: zip_cycle(t0, t1, l1, [{h0, h1} | acc])

  defp zip_cycle([], _, _, acc),
    do: :lists.reverse(acc)
end