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VarBundle

[![CRAN\_Download\_Badge](https://cranlogs.r-pkg.org/badges/VarBundle)](https://cran.rstudio.com/web/packages/VarBundle/index.html) [![CRAN\_Status\_Badge](https://www.r-pkg.org/badges/version/VarBundle)](https://cran.r-project.org/package=VarBundle)

VarBundle supports defensive programming by making it easy for R developers to bundle conceptually related read-only variables in a named, list-like object of immutable constants.

Installation

# Install the released version from CRAN:
install.packages("VarBundle")

# Install the development version from GitHub:
# install.packages("devtools")
devtools::install_github("loudermilk/VarBundle")

Usage

VarBundle fields can be accessed like lists.
library(VarBundle)
thresholds <- varbundle(list(min = 1, max = 100))

# Read-only Access
thresholds$max #100
#> [1] 100
thresholds[["min"]] #1
#> [1] 1
But fields are read-only and new fields cannot be added after object creation.
# Assignment throws error
thresholds$min <- 25 # VarBundle fields are read only.

# Cannot create new fields after object creation
thesholds$foo <- 10 # Cannot add new fields to VarBundle
The quickest way to learn about {VarBundle} is to read the vignette.
browseVignettes(package = "VarBundle")
#> starting httpd help server ... done

Getting Help

If you have a question, encounter a bug (or typo), or have a feature request, please submit an issue on GitHub.