How do I handle errors in Haskell?

How do I handle errors in Haskell?

In Haskell, you can handle errors using the Maybe and Either types. Maybe represents a value that might be absent, while Either can represent a value or an error.

Can you give me an example of using Maybe?

Sure! Here's a simple example:

safeDivide :: Double -> Double -> Maybe Double
safeDivide _ 0 = Nothing
safeDivide x y = Just (x / y)

This function returns Nothing if the divisor is zero, otherwise it returns the result wrapped in Just.

What about using Either for error handling?

Using Either, you can provide more information about the error. Here's an example:

safeDivide :: Double -> Double -> Either String Double
safeDivide _ 0 = Left "Division by zero error"
safeDivide x y = Right (x / y)

In this case, it returns a Left with an error message if there's a division by zero.

Are there any libraries that help with error handling?

Yes, libraries like transformers and mtl provide monad transformers that can help manage errors more effectively in Haskell.