Question

Does R provide an object/function/method/keyword to get all function arguments?

Using an example:
function(a, b="default", ...) would provide a and b as well as ... within the function environment. Is there a statement similar to list(...) that would also include a and b in the result?

Or put yet another way: a shorthand for list(a=a, b=b, ...), given function(a, b, ...)

Answer 1

I think that you want match.call:

tmpfun <- function(a,b,...) {
print(as.list(match.call()))
print(as.list(match.call(expand.dots=FALSE)))
}
> tmpfun(a=1, b=2, c=3, d=4)
[[1]]
tmpfun

$a
[1] 1

$b
[1] 2

$c
[1] 3

$d
[1] 4

[[1]]
tmpfun

$a
[1] 1

$b
[1] 2

$...
$...$c
[1] 3

$...$d
[1] 4