lens-family

Lens Families

Version on this page:1.2.2
LTS Haskell 22.14:2.1.3
Stackage Nightly 2024-03-28:2.1.3
Latest on Hackage:2.1.3

See all snapshots lens-family appears in

BSD-3-Clause licensed by Russell O'Connor
Maintained by Russell O'Connor
This version can be pinned in stack with:lens-family-1.2.2@sha256:7bcad928c1e027e843574983975f2a2c8a3be369eba9a381ea7a290f9fc86660,1755

Module documentation for 1.2.2

  • Lens
    • Lens.Family2
      • Lens.Family2.State
        • Lens.Family2.State.Lazy
        • Lens.Family2.State.Strict
      • Lens.Family2.Stock
      • Lens.Family2.Unchecked

This package provides first class functional references. In addition to the usual operations of getting, setting and composition, plus integration with monad state, lens families provide some unique features:

  • Polymorphic updating

  • Traversals

  • Cast projection functions to read-only lenses

  • Cast "toList" functions to read-only traversals

  • Cast semantic editor combinators to modify-only traversals.