Midday Keynote: Profunctor Optics: The Categorical Approach

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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

Lambda World 2017

The largest Functional programming event in the country