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Assert Argument is a Named List or Vector

Source: R/assertions.R
assert_named.Rd

Assert that all elements of the argument are named.

Usage

assert_named(
  arg,
  optional = FALSE,
  arg_name = rlang::caller_arg(arg),
  message = NULL,
  class = "assert_named",
  call = parent.frame()
)

Arguments

arg

A function argument to be checked

optional

Is the checked argument optional? If set to FALSE and arg is NULL then an error is thrown

arg_name

string indicating the label/symbol of the object being checked.

message

string passed to cli::cli_abort(message). When NULL, default messaging is used (see examples for default messages). "{arg_name}" can be used in messaging.

class

Subclass of the condition.

call

The execution environment of a currently running function, e.g. call = caller_env(). The corresponding function call is retrieved and mentioned in error messages as the source of the error.

You only need to supply call when throwing a condition from a helper function which wouldn't be relevant to mention in the message.

Can also be NULL or a defused function call to respectively not display any call or hard-code a code to display.

For more information about error calls, see Including function calls in error messages.

Value

The function throws an error if arg is not a named list or vector or returns the input invisibly otherwise

See also

Checks for valid input and returns warning or errors messages: assert_atomic_vector(), assert_character_scalar(), assert_character_vector(), assert_data_frame(), assert_date_vector(), assert_expr(), assert_expr_list(), assert_filter_cond(), assert_function(), assert_integer_scalar(), assert_list_element(), assert_list_of(), assert_logical_scalar(), assert_numeric_vector(), assert_one_to_one(), assert_param_does_not_exist(), assert_s3_class(), assert_same_type(), assert_symbol(), assert_unit(), assert_vars(), assert_varval_list()

Examples

example_fun <- function(varval_list) {
  assert_named(varval_list)
}

example_fun(list(var1 = 1, var2 = "x"))

try(example_fun(list(1, "x")))
#> Error in example_fun(list(1, "x")) : 
#>   All elements of `varval_list` argument must be named.
#> ℹ The indices of the unnamed elements are 1 and 2

try(example_fun(list(var = 1, "x")))
#> Error in example_fun(list(var = 1, "x")) : 
#>   All elements of `varval_list` argument must be named.
#> ℹ The indices of the unnamed elements are 2