Re: [Haskell-cafe] Equivalent of if/then/else for IO Bool?

Dougal Stanton wrote:

Is there some sort of equivalent of the if/then/else construct for use in the IO monad? For instance the following can get quite tedious:

...

do bool <- doesFileExist filename if bool then sth else sth'

Is there a more compact way of writing that? Something akin to:

...

condM (doesFileExist filename) (sth) (sth')

I'd suggest cond t f True = t cond t f False = f and then you use it like doesFileExist filename >>= cond sth sth' I find it strange that we have 'maybe' for 'Maybe', 'either' for 'Either', 'foldr' for '[]', but a special syntactic form for 'Bool'. Why is there no 'cond' in the Prelude? -Udo -- There is no snooze button on a cat who wants breakfast.