nargs {base} | R Documentation |
When used inside a function body, nargs
returns the number of
arguments supplied to that function, including positional
arguments left blank.
nargs()
tst <- function(a, b = 3, ...) {nargs()} tst() # 0 tst(clicketyclack) # 1 (even non-existing) tst(c1, a2, rr3) # 3 foo <- function(x, y, z, w) { cat("call was", deparse(match.call()), "\n") nargs() } foo() # 0 foo(,,3) # 3 foo(z=3) # 1, even though this is the same call nargs()# not really meaningful