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
andarg
isNULL
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)
. WhenNULL
, 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