Assert input is a character vector — assert

Assert an R object is a 'character' type. Works for vector and matrix objects. To assert an object is specifically a character vector see assert_character_vector()

Usage

assert_character(x, msg = NULL, call = rlang::caller_env(), arg_name = NULL)

Arguments

x: An object
msg: A character string containing the error message to display if x is not a character vector
call: Only relevant when pooling assertions into multi-assertion helper functions. See cli_abort for details.
arg_name: Advanced use only. Name of the argument passed (default: NULL, will automatically extract arg_name).

Value

invisible(TRUE) if x is a character vector, otherwise aborts with the error message specified by msg

Examples

try({
assert_character("a") # Passes
assert_character("a") # Passes
assert_character(c("a", "b", "c")) # Passes
assert_character(matrix(c('A', 'B', 'C', 'D')))  # Passes
assert_character(1:3) # Throws default error
assert_character(c("a", 1, "b"), "Custom error message") # Throws custom error
})
#> Error in eval(expr, envir) : 
#>   '1:3' must be a character, not a integer