What are some examples of error handling in Haskell?

What are some examples of error handling in Haskell?

In Haskell, error handling can be done using types like 'Maybe' and 'Either'. For example, 'Maybe' can represent a value that might be absent.

Can you show me a code example 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.

What about using 'Either' for error handling?

'Either' is great for returning error messages. Here's an example:

safeDivideEither :: Double -> Double -> Either String Double
safeDivideEither _ 0 = Left "Cannot divide by zero"
safeDivideEither x y = Right (x / y)

This returns a 'Left' with an error message or 'Right' with the result.

Are there any libraries that help with error handling in Haskell?

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