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Bartosz Milewski at Lambda World 2017


Profunctor Optics: The Categorical Approach

Haskell lens library offers fine-grain declarative access to immutable (persistent) data structures. Its main attraction is that it’s compositional: you can focus on substructures of larger structures simply by composing polymorphic higher-order functions. Its most general formulation is known as profunctor optics. I’ll talk about the categorical foundation of profunctor optics.

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