Initial upload

elixir/rpn-calculator/lib/rpn_calculator.ex

@@ -0,0 +1,21 @@
+defmodule RPNCalculator do
+  def calculate!(stack, operation) do
+    operation.(stack)
+  end
+
+  def calculate(stack, operation) do
+    try do
+      {:ok, operation.(stack)}
+    rescue 
+      _ in RuntimeError -> :error
+    end
+  end
+
+  def calculate_verbose(stack, operation) do
+    try do
+      {:ok, operation.(stack)}
+    rescue 
+      e in ArgumentError -> {:error, e.message}
+    end
+  end
+end