When you define a function and want the user to be able to pass variable names without the need to have them stored in a vector c() or list() beforehand and without putting the names into quotation marks, you can convert this variable list passed as ... into a character vector.
Note: If the user passes a list of characters it is returned as given.
Examples
# Example function
print_vnames <- function(...){
var_names <- args_to_char(...)
print(var_names)
}
print_vnames(age, sex, income, weight)
print_vnames("age", "sex", "income", "weight")
# You can also pass in a character vector, if you have stored variable names elsewhere
var_names <- c("age", "sex", "income", "weight")
print_vnames(var_names)