RPN Calculator - Elixir - Exercism

rpn_calculator.ex

defmodule RPNCalculator do
  @spec calculate!(list(), Function.t()) :: :ok
  def calculate!(_stack, operation) do
    operation.(1)
  end

  @spec calculate(list(), Function.t()) :: {:ok, String.t()} | :error
  def calculate(_stack, operation) do
    try do
      operation.(1)
      {:ok, "operation completed"}
    rescue
      _ -> :error
    end
  end

  @spec calculate_verbose(list(), Function.t()) :: {:ok | :error, String.t()}
  def calculate_verbose(_stack, operation) do
    try do
      operation.(1)
      {:ok, "operation completed"}
    rescue
      e in ArgumentError -> {:error, e.message}
    end
  end
end