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Lenses

Lenses are a modular, functional method to update and read immutable record fields. They were developed originally by the Haskell community but have now been ported to other languages, including OCaml. If you’re writing a functional application with deeply-nested immutable records, Lenses are very helpful.

• Lens: A lens implementation in OCaml. Includes a PPX rewriter for boilerplate lens accessors.
• Accessor: Jane Street’s version of Lenses. Compiles against either Base, Core or Async. Also includes a PPX rewriter, as well as a TON of features.
• Optics: Experimental library supporting both Lenses and their cousins, Prisms for variants.