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This package provides families of lenses, isomorphisms, folds, traversals, getters and setters.
Costate Comonad Coalgebra is equivalent of Java's member variable update technology for Haskell
@PLT_Borat on twitter
The FAQ, which provides links to a large number of different resources for learning about lenses and an overview of the derivation of these types can be found on the Lens Wiki along with a brief overview and some examples.
Documentation is available through github (for HEAD) or hackage for the current and preceding releases.
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Slides from this talk are also available.
<iframe width="1200" height="720" src="https://www.youtube.com/embed/cefnmjtAolY?hd=1&start=74" frameborder="0" allowfullscreen="1"></iframe>