Where is list.names?

? Wed, 30 Mar 2022 11:27:05 +0200 G?ran Brostr?m
<goran.brostrom at umu.se> ?????:

I can guess what 'list.names' is (from the documentation), but
where and how is it defined?

Interesting! It's defined first thing inside the function, so by the 
time the function tries to use the argument, list.names exists and
can be called, but for all other purposes, it's not there.

Thanks for that (also thanks to Eric)!

What if you don't set a default value for dnn in your wrapper or

That works, if I check for missing argument:


table <- function(...,
                   useNA = "ifany",
                   exclude = if (useNA == "no") c(NA, NaN),
                   dnn,
                   deparse.level = 1){
     if (missing(dnn)){
         base::table(...,
                     exclude = exclude,
                     useNA = useNA,
                     deparse.level = deparse.level)
     }else{
         base::table(...,
                     useNA = useNA,
                     exclude = exclude,
                     dnn = dnn,
                     deparse.level = deparse.level)
     }
}

Is this the final word?

G?ran

even mention dnn as a formal argument in your wrapper? In many cases,
it's possible to forward missing arguments to functions and have them
do the right thing. The only other solution I can think of is
non-standard evaluation.