Re: [stack] What does "concatenative" actually mean?

On Mar 3, 2009, at 2:00 PM, Rodney D Price wrote:

> Haskell *does* need a monad to do I/O.

Haskell doesn't need a monad to do I/O. The alternative would be ugly  
as Mr. Cowan said, but it's not a requirement.

The easiest way to do it would be to pass a "world value" into the  
program and then use uniqueness types to ensure no I/O actions are  
performed when there exists more than one reference to the world  
value. In this approach, you'd have to manually plumb the world state  
around instead of using monads.

- John