lens-family

Lens Families

Version on this page:	1.2.1
LTS Haskell 24.18:	2.1.3
Stackage Nightly 2025-11-04:	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-1.2.1@sha256:9407dff8059fa2886ca669694f24a5b079c5d51a0831dd5c7dd9dc949845b8d0,1750

Module documentation for 1.2.1

Lens
- Lens.Family2

Depends on 5 packages(full list with versions):

base, containers, lens-family-core, mtl, transformers

Used by 1 package in nightly-2017-01-31(full list with versions):

lens-simple

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.