Profunctor Optics: The Categorical Approach - Bartosz Milewski

This presentation was the midday keynote of Lambda World 2017 by Bartosz Milewski.
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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