\Header{is.function}{Is an Object of Type Function?}
\keyword{programming}{is.function}
\begin{Usage}
\begin{verbatim}is.function(x)\end{verbatim}
\end{Usage}
\begin{Description}
\texttt{is.function} returns \texttt{TRUE} if \texttt{x} is a function
and \texttt{FALSE} otherwise.\end{Description}

