Check variables in a data frame are valid character or factor.

Usage

assert_valid_variable(
  df,
  vars,
  label = deparse(substitute(df)),
  types = NULL,
  ...
)

df: (data.frame) input dataset.
vars: (character) variables to check.
label: (string) labels of the data frame.
types: Named (list) of type of the input.
...: further arguments for assert_valid_var. Please note that different methods have different arguments so if provided make sure the variables to check is of the same class.