lenses

0.0.3

Elegant Data Manipulation with Lenses

0packages depend

2.3Kdownloads / year

8.0%test coverage

11/13checks pass

Overview

About

Maintained by Chris HammillFirst published 2019-03-061 releasesCRAN page ↗GitHub ↗

Provides tools for creating and using lenses to simplify data manipulation. Lenses are composable getter/setter pairs for working with data in a purely functional way. Inspired by the 'Haskell' library 'lens' (Kmett, 2012) https://hackage.haskell.org/package/lens. For a fairly comprehensive (and highly technical) history of lenses please see the 'lens' wiki https://github.com/ekmett/lens/wiki/History-of-Lenses.

Install

R (CRAN)pak (dev)Ubuntu (r2u)openSUSE (OBS)

install.packages("lenses", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("cfhammill/lenses")

Development version from cfhammill/lenses. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-lenses

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-lenses

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

2NOTE11OK

Failing flavors

NOTE r-devel-linux-x86_64-debian-clang
NOTE r-devel-linux-x86_64-debian-gcc

Slowest check: 1.1 min · r-oldrel-windows-x86_64

Code health

Yes

Tests · ratio 0.02

8.0%

Coverage · measured lines

96%

Documentation · exports

Dependencies · direct

Check history

NOTE2026-03-10
9 OK · 5 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 1,449 wordsVignettesNopkgdown siteNoNEWSNoCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 100%
Return-value docs: 0%
References docs: 0%

Downloads

2.3K

CRAN downloads in the past year

Rank #18,445 · ~6/day · ~195/mo

Releases R versions

Daily download trend is not available in this view yet.

19430 days

62190 days

2.3K1 year

Compare downloads with other packages →

Also on88 r2u21 autocran

Repository

GitHub ↗ cfhammill/lenses

29Stars

4Forks

17Open issues

1Open PRs

0Releases

101Commits

3Contributors

functional-programmingr

101 commits · Last activity 2019-07-10 · 0% stars, 30d

Stars over time

2023-07-31 · 272026-07-07 · 29

Repository practices

Upstream repositoryBeta

2 development-tooling and community-health practices detected across 2 families in the upstream repository

Checks run against github.com/cfhammill/lenses on 2026-07-19.

CRAN release process (1)

cran-comments.md

Docs source (1)

README.Rmd

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

4 external dependencies (excludes base and recommended)

Depends (0)

none

Imports (3)

magrittr tidyselect rlang

LinkingTo (0)

none

Suggests (1)

testthat

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

People & History

People (2)

Maintainer (1)

Chris Hammill

Author, Maintainer, Translator

Authors (2)

Chris Hammill

Author, Maintainer, Translator

Ben Darwin

Author, Translator

Translators (2)

Chris Hammill

Author, Maintainer, Translator

Ben Darwin

Author, Translator

Package Timeline

1 release. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
0.0.3Latest
2026-03-10 · current release
R
R 4.5.0 released · 2025-04-11

Package metadata

First published: 2019-03-06
Total releases: 1 / 7 yrs
License: MIT + file LICENSE OSI
Download size: 25 KB
Installed size: not tracked yet
With dependencies: not tracked yet

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