An alternative to stopifnot/assert_that etc — check_that • azkit

If the predicate function is true of x then x is returned. Otherwise, an error is thrown with a custom message.

Usage

check_that(x, predicate, message, pf = parent.frame())

Arguments

x: The object to be checked
predicate: The predicate function used to check x
message: A custom error message, as a string. Will be shown to the user if the predicate check does not succeed. Can include glued variables and {cli} semantic markup.
pf: Set as parent.frame() so variables in the caller environment can be used in the custom error message.

See also