lens-family

Lens Families

Version on this page:	1.2.0
LTS Haskell 24.16:	2.1.3
Stackage Nightly 2025-10-24:	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-1.2.0@sha256:8e70f53b460d50c3655a161798cf04afe7690a4d40ad2161a32bc0ed159dc1c0,1750

Module documentation for 1.2.0

Lens
- Lens.Family2

Depends on 5 packages(full list with versions):

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

Used by 1 package in nightly-2015-11-28(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.