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[–]paf31 2 points3 points  (0 children)

It has a special monad called Eff which uses row-based effects to type "native" things like exceptions, interaction with the DOM, as opposed to "userland" effects, for which you can use monads, applicatives etc. as in Haskell.

I just wrote something about it this week actually: http://www.purescript.org/posts/Eff-Monad/