How do I handle exceptions in Haskell?

How do I handle exceptions in Haskell?

In Haskell, you can handle exceptions using the Control.Exception module. You can use functions like catch and try.

Can you give me an example of using catch?

Sure! Here's a simple example:

import Control.Exception

main :: IO ()
main = do
    result <- try (evaluate (1 `div` 0)) :: IO (Either SomeException Int)
    case result of
        Left ex  -> putStrLn $ "Caught an exception: " ++ show ex
        Right val -> print val

What about using try instead?

Using try is quite similar. It also returns an Either type. Here's an example:

import Control.Exception

main :: IO ()
main = do
    result <- try (readFile "nonexistent.txt") :: IO (Either SomeException String)
    case result of
        Left ex  -> putStrLn $ "Caught an exception: " ++ show ex
        Right content -> putStrLn content

Are there any best practices for exception handling in Haskell?

Yes, it's best to use exceptions for truly exceptional cases, avoid using them for control flow, and ensure proper cleanup with bracket or similar functions.