[Haskell-cafe] IO is a bad example for Monads
ketil+haskell at ii.uib.no
Sun Dec 9 17:35:42 EST 2007
Daniel Fischer <daniel.is.fischer at web.de> writes:
>>> IO is important because you can't write any real program without using
>> Ouch! I get awfully discouraged when I read statements like this
> I think Lennart was referring to that, you HAVE to know a little IO to write
> programmes, at least getArgs, getLine, putStr(Ln), readFile, writeFile,
> appendFile. And therefore some use of the IO monad has to be taught
> relatively early.
Well, I guess you could get pretty far using 'interact' - far enough
in an educational setting to do lists and Maybe, and then monads,
before introducing monadic IO.
If I haven't seen further, it is by standing in the footprints of giants
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