validateBrackets - A Haskell MonadFail Exploration

This small Haskell project demonstrates how to validate a string of parentheses using monadic folding (foldM) in polymorphic monads (Maybe and Either). It showcases how to use custom MonadFail instances, pattern matching, and safe error handling in idiomatic Haskell.

🔧 Requirements

• GHC
• Stack

🚀 How to Run

stack run

You should see output like:

Running validateBrackets ...
Right "Success"
Just "Success"
Left "Unbalanced parens"