maybe

1.1.0

The Maybe Monad

6packages depend

3.9Kdownloads / year

100.0%test coverage

12/13checks pass

Overview

About

Maintained by Andrew McNeilFirst published 2022-01-275 releasesCRAN page ↗GitHub ↗

The maybe type represents the possibility of some value or nothing. It is often used instead of throwing an error or returning `NULL`. The advantage of using a maybe type over `NULL` is that it is both composable and requires the developer to explicitly acknowledge the potential absence of a value, helping to avoid the existence of unexpected behaviour.

Install

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

install.packages("maybe", 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("armcn/maybe")

Development version from armcn/maybe. 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-maybe

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

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-maybe

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# 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-maybe

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

Health

CRAN checks

1NOTE12OK

Failing flavors

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

Slowest check: 8.1 min · r-devel-linux-x86_64-fedora-clang

Code health

Yes

Tests · ratio 1.28

100.0%

Coverage · measured lines

97%

Documentation · exports

Dependencies · direct

Check history

NOTE2026-08-01
12 OK · 1 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 718 wordsVignettesNopkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 100%
Documented parameters: 98%
Return-value docs: 100%
References docs: 0%

Downloads

3.9K

CRAN downloads in the past year

Rank #11,788 · ~11/day · ~324/mo

Releases R versions

Daily download trend is not available in this view yet.

23630 days

85990 days

3.9K1 year

Compare downloads with other packages →

Also on99 r2u2 autocran908 conda_forge

Repository

GitHub ↗ armcn/maybe

49Stars

1Forks

0Open issues

0Open PRs

5Releases

47Commits

1Contributors

functional-programmingrstatsr

47 commits · Last activity 2023-08-10 · 0% stars, 30d

Stars over time

2024-10-13 · 472026-07-07 · 49

Repository practices

Upstream repositoryBeta

5 development-tooling and community-health practices detected across 5 families in the upstream repository

Checks run against github.com/armcn/maybe on 2026-07-31.

Continuous integration (1)

GitHub Actions

CRAN release process (1)

cran-comments.md

Docs source (1)

README.Rmd

Lint, format, editor (1)

RStudio project

Show all practices

Coverage (1)

Codecov

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

Dependencies

Declared dependencies

4 external dependencies (excludes base and recommended)

Depends (0)

none

Imports (1)

magrittr

LinkingTo (0)

none

Suggests (3)

testthat quickcheck covr

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

6direct

0indirect

braids chronicler cyclotomic intmap monad rixpress

Code & Tests

People & History

People (1)

Maintainer (1)

Andrew McNeil

Author, Maintainer

Authors (1)

Andrew McNeil

Author, Maintainer

Package Timeline

5 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
R
R 4.4.0 released · 2024-04-24
1.1.0Latest
2023-08-07 · current release · diff ↗
R
R 4.3.0 released · 2023-04-21
1.0.0
2022-05-28 · diff ↗
R
R 4.2.0 released · 2022-04-22
0.2.1
2022-03-11 · diff ↗
0.2.0
2022-02-11 · diff ↗
0.1.0
2022-01-27
R
R 4.1.0 released · 2021-05-18

Package metadata

First published: 2022-01-27
Total releases: 5 / 4 yrs
License: MIT + file LICENSE OSI
Download size: 459 KB
Installed size: not tracked yet
With dependencies: not tracked yet

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