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A sandbox for Elixir to safely evaluate untrusted code from user input

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dune lib dune shims enum.ex
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lib/dune/shims/enum.ex 

defmodule Dune.Shims.Enum do

  @moduledoc false



  def join(env, enumerable, joiner \\ "") when is_binary(joiner) do

    enumerable

    |> Enum.map_intersperse(joiner, &Dune.Shims.Kernel.safe_to_string(env, &1))

    |> IO.iodata_to_binary()

  end



  def map_join(env, enumerable, joiner \\ "", mapper)

      when is_binary(joiner) and is_function(mapper, 1) do

    enumerable

    |> Enum.map_intersperse(joiner, &Dune.Shims.Kernel.safe_to_string(env, mapper.(&1)))

    |> IO.iodata_to_binary()

  end

end