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solid lib solid number_helper.ex
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lib/solid/number_helper.ex 

defmodule Solid.NumberHelper do

  @moduledoc false



  @spec to_integer(term) :: {:ok, integer} | {:error, binary}

  def to_integer(input) when is_integer(input), do: {:ok, input}



  def to_integer(input) do

    case Integer.parse(to_string(input)) do

      {integer, _} -> {:ok, integer}

      _ -> {:error, "invalid integer"}

    end

  end

end