[Haskell-cafe] Re: Books for "advanced" Haskell

Heinrich Apfelmus apfelmus at quantentunnel.de
Fri Mar 5 10:37:24 EST 2010

Stephen Tetley wrote:
> To work with monads in Haskell its not ignoble simple to decide what
> effect or combination of effects you want and use the relevant monad
> (for a single effect) or build a transformer (for multiple effects).

... or use the "free term algebra" approach outlined in


when the semantics of the effects are a bit tricky to fit into existing
transformers. My package "operational"


contains a bunch of examples.

Heinrich Apfelmus


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