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Effect handlers have recently been proposed as a new means of working with compositional effects, and threaten to replace monad transformers. Their key advantage is a cleaner way of expressing semantics since they are defined in terms of algebras. An often misunderstood aspect is how they compare to monad transformers with respect to compositionality of effects. This talk will introduce both methodologies and show how they relate.
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Transformers, Handlers in Disguise
Dr Nicolas Wu is a Senior Lecturer at the Department of Computing, Imperial College London. He holds a DPhil from the University of Oxford, where he also studied as an undergraduate at Brasenose College. His research interests are centred around programming languages, where he has made advances in applications of category theory for giving the semantics of programs and algorithms. In particular, his recent work has been focused on showing the connections between domain specific languages, algebraic effect handlers, and structured recursion schemes.