assert_list_of: Is an Argument a List of Objects of a Specific S3 Class?
In epijim/admiral: ADaM in R Asset Library

Description Usage Arguments Value Author(s) Examples

Checks if an argument is a list of objects inheriting from the S3 class specified.

1	assert_list_of(arg, class, optional = TRUE)

`arg`	A function argument to be checked
`class`	The S3 class to check for
`optional`	Is the checked parameter optional? If set to `FALSE` and `arg` is `NULL` then an error is thrown

The function throws an error if arg is not a list or if arg is a list but its elements are not objects inheriting from class

Thomas Neitmann

example_fun <- function(list) {
  assert_list_of(list, "data.frame")
}

example_fun(list(mtcars, iris))

try(example_fun(list(letters, 1:10)))

try(example_fun(c(TRUE, FALSE)))