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Flattening array in elixir
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| def flatten(list), do: flatten(list, []) |> Enum.reverse | |
| def flatten([h | t], acc) when h == [], do: flatten(t, acc) | |
| def flatten([h | t], acc) when is_list(h), do: flatten(t, flatten(h, acc)) | |
| def flatten([h | t], acc), do: flatten(t, [h | acc]) | |
| def flatten([], acc), do: acc |
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