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elixir/rpn-calculator/HINTS.md

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+# Hints
+
+## General
+
+- Read about [errors][errors] in the Getting Started guide.
+- Read about [`try`][docs-try] in the documentation.
+
+## 1. Warn the team
+
+- Allow the operation function to raise its error.
+- To invoke a function in a variable, use the `.` operator.
+
+## 2. Wrap the error
+
+- Make use of try .. rescue to return the intended result.
+
+## 3. Pass on the message
+
+- Make use of try .. rescue to return the intended result.
+- The rescue block allows you to pattern match on the error's Module name and also bind the error to a variable.
+
+[errors]: https://elixir-lang.org/getting-started/try-catch-and-rescue.html#errors
+[docs-try]: https://hexdocs.pm/elixir/Kernel.SpecialForms.html#try/1