\Header{is.function}{Is an Object of Type Function?}
\keyword{programming}{is.function}
\begin{Description}\relax
Checks whether its argument is a function.
\end{Description}
\begin{Usage}
\begin{verbatim}is.function(x)\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{x}] an \R{} object.
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
\code{is.function} is generic: you can write methods to handle
specific classes of objects, see \link{InternalMethods}.
\end{Details}
\begin{Value}
\code{TRUE} if \code{x} is a function, and \code{FALSE} otherwise.
\end{Value}

