lenses

Provides tools for creating and using lenses to simplify data manipulation. Lenses are composable getter/setter pairs for working with data in a purely functional way. Inspired by the 'Haskell' library 'lens' (Kmett, 2012) https://hackage.haskell.org/package/lens. For a fairly comprehensive (and highly technical) history of lenses please see the 'lens' wiki https://github.com/ekmett/lens/wiki/History-of-Lenses.

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