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\description{
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\description{
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  When used inside a function body, \code{nargs} returns the number of
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  When used inside a function body, \code{nargs} returns the number of
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  arguments supplied to that function, \emph{including} positional
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  arguments supplied to that function, \emph{including} positional
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  arguments left blank.
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  arguments left blank.
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}
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}
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole.
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}
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\seealso{\code{\link{args}}, \code{\link{formals}} and \code{\link{sys.call}}.}
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\seealso{\code{\link{args}}, \code{\link{formals}} and \code{\link{sys.call}}.}
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\examples{
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\examples{
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tst <- function(a, b = 3, ...) {nargs()}
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tst <- function(a, b = 3, ...) {nargs()}
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tst() # 0
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tst() # 0
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tst(clicketyclack) # 1 (even non-existing)
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tst(clicketyclack) # 1 (even non-existing)