Assert that the input vector has no duplicates — assert_no_duplicates • assertions

Assert the input vector has no duplicated elements

Usage

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

Arguments

x: A vector.
msg: A character string containing the error message to display if x has duplicates.
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 has no duplicates, otherwise aborts with the error message specified by msg

Examples

try({
assert_no_duplicates(c(1, 2, 3))  # Passes
assert_no_duplicates(c(1, 2, 2))  # Throws default error

assert_no_duplicates(c(1, 2, 3), msg = "Custom error message")  # Passes
assert_no_duplicates(c(1, 2, 2), msg = "Custom error message")  # Throws custom error
})
#> Error in eval(expr, envir) : 
#>   'c(1, 2, 2)' must have no duplicates! Found 1 duplicated value: 2