Check User-Supplied Function Arguments.

chk

chk is an R package for developers to check user-supplied function arguments.

It is designed to be simple, customizable and fast.

Installation

To install the latest release from CRAN

install.packages("chk")

To install the latest development version from GitHub

# install.packages("remotes")
remotes::install_github("poissonconsulting/chk")

Demonstration

chk provides simple commonly used checks as (chk_ functions) which can be combined together for more complex checking.

library(chk)

y <- "a"

chk_string(y)
chk_flag(y)
#> Error:
#> ! `y` must be a flag (TRUE or FALSE).

data <- data.frame(x = 1:2)
chk_range(nrow(data), c(3, 8))
#> Error:
#> ! `nrow(data)` must be between 3 and 8, not 2.

Or used inside functions to test user-provided arguments.

my_fun <- function(x) {
  chk_flag(x)
  x
}
my_fun(TRUE)
#> [1] TRUE

my_fun(NA)
#> Error in `my_fun()`:
#> ! `x` must be a flag (TRUE or FALSE).

Error messages follow the tidyverse style guide while the errors themselves are rlang errors of class chk_error.

Information

For more information see the Get Started vignette.

Inspiration

• datacheckr
• checkr
• err
• testthat

Contribution

Please report any issues.

Pull requests are always welcome.

Code of Conduct

Please note that the chk project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.