Re: [Haskell-cafe] catching fails on read

jbergeron:

I'm new to Haskell and have a stupid question.

How can a catch a parsing error on a read? Something like

let s = "e" in read s :: Int

I've been searching for a trick and couldn't find one. I want to enter commands directly from the keyboard and don't want the program to abort if I do a typing error.

maybeRead :: Read a => String -> Maybe a maybeRead s = case reads s of [(x, rest)] | all isSpace rest -> Just x _ -> Nothing There's an open ticket to add this to the base library.