lens-family

Lens Families

Version on this page:	2.1.1
LTS Haskell 24.16:	2.1.3
Stackage Nightly 2025-10-25:	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-2.1.1@sha256:dc7b2f404f201e37f9d5c3baea4c15ee2beeb0b79f7ccd43c4b38331e22205c7,2026

Module documentation for 2.1.1

Lens
- Lens.Family2

Depends on 5 packages(full list with versions):

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

Used by 5 packages in nightly-2021-12-15(full list with versions):

proto-lens, proto-lens-arbitrary, proto-lens-protobuf-types, proto-lens-protoc, proto-lens-runtime

This package provides first class functional references in Van Laarhoven style supporting the following optics:

Lenses (view, over)
Traversals (toListOf, matching, over)
Setters (over)
Grates (zipWithOf, under, review)
Resetters (under)
Adapters (view, review)
Grids (toListOf, over / under, review)
Prisms (matching, over / under, review)
Getters (view)
Folders (toListOf)
Reviewers (review)